back to indexBogleheads® on Investing Podcast 027 – Cliff Asness, host Rick Ferri (audio only)
Chapters
0:0
9:8 The Price Momentum Strategy
14:13 Value Factor
27:0 The Value Spread
31:18 The Formula for Momentum
33:0 Buy a Diversified Portfolio
33:5 Buy a Diversified Portfolio of Stocks
34:4 Negatively Correlated Strategies
51:35 Bonds
00:00:00.000 |
- Welcome everyone to Bogle Heads-On Investing podcast number 27. 00:00:14.680 |
Today our special guest is Cliff Asness, founder, managing principal, and chief investment officer 00:00:23.760 |
Cliff has a PhD from the University of Chicago. 00:00:39.020 |
My name is Rick Ferry and this is Bogle Heads-On Investing podcast number 27. 00:00:44.400 |
This podcast, as with all podcasts, are brought to you by the John C. Bogle Center for Financial 00:00:49.960 |
Literacy, a 501(c)(3) nonprofit organization at boglecenter.net. 00:01:00.680 |
Cliff is the founder, managing principal, and chief investment officer of AQR Capital 00:01:07.120 |
At the end of 2019, the firm was managing over $186 billion of assets, in part on strategies 00:01:13.960 |
that Cliff developed at the University of Chicago as a PhD student under Nobel Laureate 00:01:20.480 |
Cliff has received many awards, including the Bernstein-Fabozzi-Jacobs-Levy Award from 00:01:25.360 |
the Journal of Portfolio Management, the Graham and Dodd Award from the Financial Analyst 00:01:29.920 |
Journal, the James Verton Award from the CFA Institute, and probably his biggest award, 00:01:35.800 |
Jack Bogle referred to Cliff Asness as a brilliant academic. 00:01:40.200 |
I will warn you that some of this podcast is going to be a little geeky, so put on your 00:01:47.280 |
With no further ado, let me introduce Cliff Asness. 00:01:58.440 |
Doctor makes me think you want me to help with an appendectomy. 00:02:05.000 |
It's a real pleasure to have you on Bogle Heads on Investing. 00:02:08.300 |
You have a lot of followers on the Bogle Heads. 00:02:11.560 |
All of your research and your background is really quite fascinating. 00:02:18.960 |
If we could start as far back as you are comfortable going, how did you get to where you are today? 00:02:27.200 |
I was a very unmotivated high school student. 00:02:35.400 |
I did very well on standardized tests and very poorly relative to those tests in classes. 00:02:41.680 |
Partially, back then you can get away with actually not doing your homework and I took 00:02:47.940 |
When applying to college, my dad found this program at the University of Pennsylvania 00:02:53.360 |
that was a dual degree program between the Wharton School and the Engineering School. 00:02:59.360 |
I had not really given any of this much thought at all and it was my father who suggested, 00:03:05.200 |
"Hey, why don't you study two things that both could help with a career because you 00:03:10.000 |
don't know what the heck you want to do and you have no direction." 00:03:12.800 |
So I really didn't start out going to school and doing that because I had a great love 00:03:17.860 |
of finance or really wanted to be a computer scientist. 00:03:29.480 |
You got to take advantage of good luck when you get it. 00:03:31.360 |
You got to minimize bad luck when you get it. 00:03:33.440 |
But if things work out well and you don't acknowledge the role of luck, you're just 00:03:39.240 |
So I went to this program, at one point, I started doing research assistant work for 00:03:44.880 |
a few different professors, one of which is quite well-known now, Andrew Lowe of MIT. 00:03:52.560 |
I ended up enjoying even the research assistant work and I think I said something to him kind 00:04:00.720 |
Why don't you think about where you want to go, see where you get in." 00:04:04.360 |
I applied to a bunch of PhD programs, got in to Chicago, Stanford, and Wharton. 00:04:12.360 |
Did not get into MIT, for which I'm still bitter about. 00:04:16.360 |
But eventually, I'm on year 32 of being bitter about that. 00:04:21.840 |
I think at some point I got to let it go, but I'm not quite there yet. 00:04:26.560 |
They said something along the lines of, "We don't take people directly from undergrad," 00:04:30.920 |
but I think that was kind of like when someone breaks up with you and says, "It's not 00:04:36.120 |
It probably wasn't because of your grades because according to the bio that I read, 00:04:40.680 |
you were a summa cum laude in both engineering and economics. 00:04:50.120 |
That day has faded and I couldn't do any of those things again, but sometime in the 00:04:58.240 |
Let's not dwell on the one school I did not get in, though I will one day extract 00:05:07.440 |
I ended up ... Wharton's a great place, but it didn't stack up against Chicago or Stanford 00:05:14.920 |
I'm not talking, of course, about MBA programs or whatnot, but PhD programs always have their 00:05:22.440 |
I basically went around to 10 professors at Wharton, told them that I'm looking to get 00:05:29.120 |
I got in these three schools and almost to a man, they said, "Shut the door," largely 00:05:35.880 |
because they were going to tell me not to go to Wharton. 00:05:40.360 |
I love my alma mater, but that was how PhD programs ranked those days. 00:05:45.640 |
Nine out of 10 told me to go to Chicago, and many of them had gone to Chicago themselves. 00:05:51.960 |
One famous professor named Robert Litzenberger, who was the next Stanford professor, he suggested 00:05:58.120 |
Stanford, but at that point in history, Chicago's where you want to be. 00:06:03.920 |
As an aside, Chicago offered to fly me out, and Stanford didn't. 00:06:09.120 |
I asked, and they said, "No, it's just not in the budget." 00:06:11.920 |
I had no money at the time, so I took Chicago up on their offer, visited on one of the most 00:06:17.240 |
gorgeous spring days Chicago has ever produced. 00:06:20.400 |
For years, I am fond of saying that I am the world's only person to choose Chicago over 00:06:25.280 |
Stanford on the weather, which turned out to be a bit of a bait and switch, but the 00:06:32.480 |
Not only did it work out well, but you got to study under some future Nobel laureates. 00:06:47.840 |
Back then, we pretty much knew he was a future Nobel laureate. 00:06:51.160 |
Frankly, I thought they gave him the prize 15 years after they should have, but you knew 00:06:59.200 |
Again, it was a lucky break for me to be at Chicago in the late 1980s when Fama and French 00:07:05.320 |
were doing a lot of the early work on what we now call systematic value investing or 00:07:16.560 |
We were just a bunch of geeks running regressions and sorting stocks on different variables, 00:07:23.440 |
The terminology came later, but I was lucky enough for Gene to ask me to be his teaching 00:07:29.280 |
assistant at the end of the year, and I did that for two years, so it basically meant 00:07:34.360 |
I kind of took his class three times, so I sat in on it pretty much every day for three 00:07:41.280 |
I got to teach review sessions and got to know Gene. 00:07:44.920 |
In PhD programs, getting good advisors, it's just a big part of it. 00:07:49.520 |
Getting advisors who are interested in you, who think well of you, I think that work helped 00:07:54.520 |
me get him and Ken French to co-chair my dissertation committee, which was quite wonderful. 00:08:01.360 |
Professor Fama was a big efficient market guy, but your thesis really had nothing to 00:08:05.560 |
do with efficient market or maybe almost to disprove efficient markets in some way. 00:08:11.160 |
Oh, first of all, we never prove or disprove things. 00:08:15.640 |
I joke about the cowardly statisticians that we are. 00:08:21.320 |
We just say there's only a one out of 100 chance we're wrong. 00:08:25.000 |
Oh, that sounds like a Wall Street analyst there. 00:08:32.760 |
It sounds kind of wimpy and cowardly, but it's also just intellectually true. 00:08:38.480 |
It can just increase the probability of your hypothesis or against your hypothesis. 00:08:44.480 |
If you see a 99 out of 100 event, it may be in fact that it's true, or maybe you've got 00:08:53.000 |
But yeah, a big part of my dissertation, not all of it, but a big part was one of the very 00:08:57.720 |
early pieces of work, Price Momentum Strategy. 00:09:02.920 |
It has to go to Professors Jagadish and Tippmann, who wrote the first big published paper on 00:09:10.960 |
I was fairly concurrent with them, and I am proud that my definition, partly because Fahman 00:09:17.100 |
French adopted it for Ken French's kind of data website and used it in their papers. 00:09:22.760 |
It's kind of the most common one people use today, UMD, up minus down, for basically one 00:09:32.400 |
I do remember very, very distinctly being nervous about precisely what you just said, 00:09:40.200 |
I'm lucky to have this relationship with the premier advocate for the efficient markets 00:09:43.800 |
hypothesis in the world, and I have all these preliminary results saying that a fairly straightforward 00:09:54.240 |
I distinctly remember telling him, "Gene," and I say Gene now, "Professor Fahman," certainly 00:10:00.560 |
it took me 15 years after the program until I would call him Gene, even though he kept 00:10:05.120 |
telling me to, "Professor Fahman, I want to write a dissertation on price momentum," 00:10:10.640 |
and then I mumbled the second part out of fear, "And it works really well." 00:10:18.040 |
And he thought for a bit, and he said something that has always stayed with me. 00:10:21.960 |
It was actually in a weird, geeky way, almost kind of moving. 00:10:26.040 |
He said, "If it's in the data, write the paper," which to me said, "Look, this might not be 00:10:33.840 |
I might consider it the exception that proves the rule," but data's kind of holy to him, 00:10:39.400 |
and that kind of stuck with me, and it also allowed me to get on the path to graduation, 00:10:46.080 |
Though even then I was not crazy enough to say, "Gee, I found something better than your 00:10:53.600 |
First of all, that would have been bad economics. 00:10:56.080 |
They work better, if you believe both of them, they work better together. 00:11:01.160 |
Systematic value can make money over the long term. 00:11:04.200 |
Systematic momentum can, and they're fairly negatively correlated, which is a wonderful 00:11:11.360 |
It would have been bad graduation strategy to tell Fahman, "We're going to do this instead 00:11:16.400 |
of value," saying, "It's a compliment to your wonderful value strategy," was some sucking 00:11:23.480 |
>>Corey: Well, let me ask just a couple of questions on what you just said. 00:11:27.760 |
Did Fahman ever call what he did "value investing"? 00:11:30.600 |
>>David: It's funny you ask that, because I keep meaning to go back and check the original 00:11:37.480 |
It's certainly possible when the world started calling it that, that they eventually referred 00:11:43.060 |
I don't even know that, but I don't remember them calling it a value factor or whatnot. 00:11:48.360 |
I think that was index providers and maybe other papers that did it. 00:11:52.960 |
I think they were just looking at multiples and whatnot to sort stocks. 00:11:57.400 |
I could be dead wrong about this, but from memory, I don't remember being at Chicago 00:12:04.280 |
But certainly that label caught on, and I actually don't even think it's the best label. 00:12:10.280 |
It creates tremendous confusion, because you're kind of Graham and Dodd, old-fashioned, concentrated 00:12:16.200 |
portfolio, active management, value managers. 00:12:21.560 |
Get mad, because they look at the quantitative factor, and they say, "That's not value." 00:12:27.240 |
Value is the price against fundamentals in consideration of things like which are better 00:12:33.880 |
companies, safer companies, faster-growing companies, more profitable companies. 00:12:39.520 |
The answer is quants don't think price divided by anything, books, sales, cash flow, earnings, 00:12:49.720 |
We agree with those managers, and we just call them different factors, things like the 00:12:54.760 |
profitability factor, earnings momentum, low-risk investing. 00:12:59.480 |
Those are all in the direction of the things that Graham and Dodd people want us to consider, 00:13:03.720 |
but they just put the whole thing together and call a cheap company one that's cheap 00:13:10.000 |
We break it up and call them other factors, and 1,000 fights have been caused by that 00:13:15.720 |
when they're really, through very different methods, concentration versus diversification, 00:13:20.760 |
judgment versus systematic, but through very different methods. 00:13:23.960 |
I think they're often looking for the same kind of things in the stocks. 00:13:28.360 |
I always thought that beta can be agreed upon. 00:13:32.120 |
You can take all the stocks on the market, weight them by either the shares outstanding 00:13:37.120 |
in the public float or total shares outstanding, something, but we all can come to an agreement 00:13:42.320 |
on what the beta of the market should be and that size, meaning large-cap stocks, mid-cap 00:13:50.960 |
stocks, small-cap stocks, even micro-cap stocks, in general, all of the index providers can 00:14:01.480 |
They are all pretty close, but when it comes to value, I always say value is in the eyes 00:14:10.640 |
First, I think that's fair, but let's talk about the value factor, what I would prefer 00:14:16.600 |
to call the price factor, not the holistic considering other aspects, just price divided 00:14:27.880 |
Someone else could choose a weighted average of how it looks on many different reasonable 00:14:36.660 |
We wrote a paper on this in 1994 and tried to use this value factor to bet within industries, 00:14:44.960 |
meaning we don't think it's very effective across industries. 00:14:49.480 |
The standard work in almost all of academia and a fair amount of the indices allows very 00:14:55.880 |
In fact, it always strikes me that the way we invest in value, we try very hard not to 00:15:01.360 |
take an industry bet, and the way many speak about value is only in terms of industry bets, 00:15:09.860 |
All of these things make your value possibly different than my value, but if we both use 00:15:16.260 |
a handful of reasonable measures and have a portfolio construction technique, I also 00:15:21.500 |
didn't mention how you weight them, can be different. 00:15:26.620 |
You could do a signal weighted where the degree of the valuation signal tells you your position. 00:15:31.600 |
You could do equal weight, and of course, those will have somewhat different results 00:15:36.000 |
and have somewhat different degrees of implementability. 00:15:46.880 |
We'll write a paper on that when you get off this podcast. 00:15:49.840 |
With that said, I do think if you create your favorite value strategy, and it's reasonable, 00:15:57.420 |
deflating price by four or five of the major things out there, I might do it within industries. 00:16:05.580 |
We're going to be, I'm making this up, don't hold me to it, we're going to be 0.8 correlated. 00:16:10.780 |
What's amazing is over a couple of years, how different sometimes 0.8 correlated things 00:16:19.540 |
Some of the choices, they may not be provable which one's better, but over the short, even 00:16:26.320 |
But 0.8 correlated says to me, you are right, there is no God-given way to measure value. 00:16:33.720 |
But I think it matters a little less than people worry about, because price is the main 00:16:43.380 |
Price compared to anything reasonable leads to at least fairly decently correlated strategies. 00:16:49.460 |
I'd also say cap-weighted market, even that has a little degree of ambiguity. 00:16:57.620 |
You know, Wilshire 5000 versus S&P 500, size is actually even a little more complicated. 00:17:04.180 |
I would agree still with your statement that size and the market are more common. 00:17:08.700 |
If you and I both come up with a definition, we're probably going to be more correlated 00:17:13.300 |
But I still think of value, there's a concept that any decent value factor follows, deflating 00:17:21.140 |
price by reasonable things and going long, the cheap and short, the expensive on that 00:17:27.700 |
And again, yours and mine, we might fight to the death over whose is better. 00:17:32.060 |
We're kind of co-religionists who differ slightly in our dogma at that point. 00:17:37.020 |
And as we've seen in history, those are some of the most vicious fights. 00:17:46.140 |
I think, of course, after years of doing this, that our way is the best humanly possible. 00:17:50.300 |
And I don't mean that arrogantly, I mean that in a sense of we would do it differently if 00:17:54.740 |
we didn't think it was the best way to do it, and I'm sure our competitors would. 00:18:01.460 |
I think you're right directionally, but I think it is less... 00:18:04.480 |
You didn't even say it was a problem, but I don't think it's a problem. 00:18:06.580 |
I think most reasonable ways to come up with value will be more similar than you think. 00:18:11.380 |
Some people believe that a multi-factor approach to value might solve the problem, at least 00:18:20.460 |
In other words, instead of trying to pick which price to something is value, you just 00:18:26.500 |
have a formula that takes a little bit of everything. 00:18:36.540 |
Earning is going a little too far, price divided by, you know, you can imagine crazy things. 00:18:42.380 |
I think I even used this phrase a few minutes ago. 00:19:00.340 |
And I can tell you advantages and disadvantages to each one. 00:19:04.880 |
I would prefer a stock that is the most attractive on a weighted average of those five more than 00:19:14.780 |
I'm not smart enough and I don't know if anyone else is to pick out which of those five is 00:19:23.860 |
But I don't think we're really smart enough to figure out collectively. 00:19:27.180 |
I don't think value is that, as you pointed out earlier, that well-defined a concept. 00:19:37.580 |
Is the value premium, at least historically, a result of risk or is it a result of behavior? 00:19:56.460 |
They both can contribute to a positive value premium. 00:20:03.060 |
Sometimes I like to throw gasoline on a fire. 00:20:06.060 |
In this particular case, I often throw water on the fire because I've been in academic 00:20:10.860 |
seminars where I point out, you guys are arguing about this, but the real world is complicated. 00:20:17.300 |
It could have a risk premium component and a behavioral component and just to really 00:20:21.860 |
mess with everyone, those can vary through time. 00:20:25.300 |
Right now, I think we're in a fairly crazy period and I'll go out on a limb and say I 00:20:28.780 |
think there are more mispricings than normal. 00:20:30.940 |
So maybe behavioralism matters more right now and maybe sometimes it matters less and 00:20:38.420 |
I will tell you, and this is why I said you're going to get me in trouble, even though I 00:20:42.020 |
wrote my dissertation on momentum as a Pharma student, I was probably two-thirds, one-third 00:20:49.420 |
Doing this live for now 26 years, going back to '94, I've certainly drifted more towards 00:20:56.380 |
I think living through about six cataclysmic events and at least three for value and being 00:21:03.420 |
frustrated at those times, to be honest, a world I thought was going a little crazy has 00:21:11.900 |
I'm probably two-thirds, one-third, the other way. 00:21:14.060 |
Now, I'm not someone who feels intellectually confident saying we know the answer here, 00:21:20.100 |
but at this point in my career, if I had to bet on one and couldn't split my vote, I would 00:21:25.940 |
lean behavioral, though I warn you, I say that on the coast. 00:21:30.020 |
If I'm ever in the Midwest and feel like Pharma is within a thousand miles, I change my story. 00:21:36.540 |
It's kind of odd though that you would say that, and here's why. 00:21:40.140 |
It's because there's been so much work done on behavioral finance and biases and everything 00:21:46.340 |
that you would think that we would have resolved some of our internal human issues and that 00:21:52.780 |
we would notice that, but what you're really saying is people are acting worse than they 00:21:57.900 |
used to be, even though the research by various top Nobel laureate behavioral economists are 00:22:08.180 |
No, I think that's a fair observation and I have a few thoughts on it. 00:22:20.020 |
I think the first seven years of that drawdown were very different than the last three. 00:22:23.500 |
I think the last three have been far less rational than the first seven. 00:22:27.700 |
Remember my distinction that behavioral can matter, but it's not always behavioral. 00:22:32.100 |
But even a few years ago, not 10 years ago, even two, three years ago, maybe the most 00:22:36.860 |
common question I got was along the lines of what you're saying. 00:22:41.020 |
Not just value, but other factors too, but we'll talk about value here. 00:22:44.340 |
If this is true, why doesn't it get arbitraged away? 00:22:47.500 |
It could get arbitraged away by too much capital or people could learn and stop making these 00:22:53.860 |
The learning part, which is more where you're coming from, again, I don't see a whole lot 00:22:58.960 |
of evidence that human biases are going away or even ameliorating around the world. 00:23:05.420 |
We live in a little bit of a bubble where we're very well-versed in all these behavioral 00:23:13.800 |
But I think, not to pick on them, it's become an easy punchline, but you go to your average 00:23:18.500 |
Robin Hood trader, and I don't think we've gotten through on the arbitrage, why are these 00:23:25.820 |
Remember, strategy can go away for two reasons, it can go away for either demand or supply. 00:23:31.060 |
Demand for strategy is too much capital chasing it, which even if there is a certain amount 00:23:36.320 |
of bias in the world, you can't extract an infinite amount of money from that. 00:23:40.600 |
You can only take the other side and close the gap on valuation. 00:23:44.340 |
So if the first trillion dollars closes most of the gap, the second trillion dollars doesn't 00:23:56.540 |
And this is a little bit cynical, but this is behavioral, this is the supply of investor 00:24:03.100 |
People have to continue to make errors and a limited amount of capital has to pursue 00:24:08.740 |
So again, two and a half, three years ago, the question was, why do these things persist? 00:24:13.180 |
After two and a half, three painful years to these strategies, the question I get now 00:24:19.140 |
is more, how can anyone stick with these, even if they're great long-term, how can anyone 00:24:25.060 |
And I love to point out that these are, in a real way, the opposite question. 00:24:30.280 |
One is saying, this is so obvious, everyone should do it and it should go away. 00:24:36.140 |
And I think there's an element of truth to both. 00:24:39.860 |
Real life strategies that can be done in large capacity, I mean a strategy like value that 00:24:44.500 |
can be done at fairly large scale, is not a super high Sharpe ratio. 00:24:51.380 |
And so a real positive Sharpe ratio, you can add to a diversified portfolio, that is a 00:24:57.980 |
But it goes through, as we've seen even before the last 10 years, we've seen horrible periods 00:25:04.100 |
And the very fact that it can be very hard to stick with drives a fair amount of people 00:25:08.460 |
out, makes it hard to see the whole round trip. 00:25:14.420 |
On the other hand, it's really hard to stick with. 00:25:17.020 |
And perversely, I think low Sharpe ratio, high capacity strategies that are a long-term 00:25:24.420 |
investor's good friend, if you really can stick with them, they can improve a portfolio. 00:25:31.140 |
And I think they don't go away precisely because they're at that kind of risk-adjusted return 00:25:40.980 |
But a lot of people think they can, but can't. 00:25:43.780 |
And so if something is real, but 90% of the people throw in the towel when it's had a 00:25:48.620 |
bad three years, it's going to stay an opportunity, and it's going to occasionally really hurt. 00:25:53.340 |
I think that the overwhelming interest in value investing that occurred in the early 00:25:58.660 |
2000s after tech tumbled and value just had an incredible run, small cap value in particular, 00:26:07.860 |
created this wave of fundamental weighted ETFs and a whole range of other factor-based 00:26:15.260 |
ETFs just came out of the woodwork, and people were inundated with this. 00:26:21.180 |
Because of all this interest and because of all this new knowledge that people were getting, 00:26:25.500 |
it seems to me made this value factor not work, but also not work for a longer period 00:26:31.140 |
of time than normally would have occurred, perhaps. 00:26:37.500 |
We certainly live in a cyclical business where people do, in fact, overreact to the prior 00:26:48.300 |
I will say, ever since 1999, when we started our firm right before the teeth of the tech 00:26:54.260 |
bubble really took off, we invented and have been tracking since then something that has 00:27:03.860 |
All right, Fama and French and many others in academia sort stocks on some valuation 00:27:08.860 |
ratio and they look at the spread between the cheap and the expensive in returns, but 00:27:13.580 |
what was really missing, we couldn't find it anywhere, it's certainly possible someone 00:27:16.940 |
privately had done it, but we didn't see it in the literature, was anyone who looked at 00:27:22.460 |
and thought the information was interesting in the magnitude. 00:27:27.900 |
Imagine all of value is price to cash flow, and again, like we talked about before, I 00:27:32.220 |
would much rather use many, but just to make it simple, you're going long, low price to 00:27:36.800 |
cash flow, and short, high price to cash flow. 00:27:39.580 |
The expensive ones will always be more expensive on your own metric, but how much more expensive 00:27:46.740 |
and how much cheaper, what the spread is between them will vary through time. 00:27:53.060 |
And we did this in the teeth of a very terrible value market and not surprisingly discovered 00:27:58.140 |
that after it being terrible, that spread had blown out to record levels. 00:28:04.440 |
You can lose in a value strategy or any strategy and have it not get cheaper. 00:28:10.540 |
Simplest example, imagine you bought a stock because it had a low P/E and the price fell 00:28:16.740 |
A naive, simple approach to say, "Oh God, it got cheaper." 00:28:20.980 |
But if the earnings fell 75%, your favorite metric, P/E doubled, it didn't get cheaper, 00:28:28.380 |
So you can actually lose in a strategy, if you lose because the fundamentals move against 00:28:33.340 |
you, it doesn't necessarily get cheaper, so it was worth checking. 00:28:37.500 |
And we did find it had gotten massively cheaper, which means most of what was going on in the 00:28:42.100 |
tech bubble, actually, I think more than all, because I don't think these were high quality 00:28:50.860 |
We've been monitoring this spread in many different ways in many different places ever 00:28:55.620 |
Halfway, of course, it's symmetric, halfway to worry about periods like now, where that 00:29:01.140 |
spread is back out to approximately record levels. 00:29:04.700 |
If you're beaten up in value, is that money gone, meaning you lost on fundamentals, which 00:29:10.260 |
you don't give up, you might continue with your strategy, but you don't expect to make 00:29:17.500 |
Or did you lose on price, where you may have an expectation that it's more attractive than 00:29:21.820 |
normal now that the premium is larger than normal. 00:29:25.820 |
But we didn't track this only for times like today. 00:29:30.020 |
Maybe even more so we tracked it to see what if that spread ever compressed well beyond 00:29:36.100 |
The only one I have memorized is price to book. 00:29:38.740 |
And I think if you look at the standard Fama-French construction, the price to book of the expensive 00:29:52.380 |
So the expensive are five or six times more expensive than the cheap. 00:29:56.100 |
The low is maybe the high threes, maybe four was the low, and you've hit that a few times. 00:30:01.860 |
And the high was about 12 in the tech bubble, 12 to 14, depending upon the precise measurement. 00:30:11.420 |
But one reason we've monitored this forever is what if that spread smashes down to one 00:30:17.580 |
and a half, to a compressed level where the differences in valuation are just not very 00:30:23.140 |
large and in fact record small compared to history, and then stayed there for a few years. 00:30:30.340 |
Your hypothesis that maybe the world has figured this out, maybe they're not making that error 00:30:35.300 |
or maybe too much arbitrage capital has come in would be hard to argue with. 00:30:42.500 |
You know, if a value strategy exists because there's a spread in valuations, if that spread 00:30:46.900 |
in valuations is much smaller than it used to be, maybe the world has figured it out. 00:30:51.820 |
And we've always felt monitoring that in case it was time not to do it was the case. 00:30:56.860 |
And we've seen lower and we've seen higher, and we certainly see extremely high today, 00:31:01.700 |
but we've never seen it smash down to levels that say, you know, value is never going to 00:31:09.380 |
It could certainly still happen in the future. 00:31:12.700 |
Let's pivot back to momentum in a very short and eloquent, simple way. 00:31:18.220 |
If you can explain the formula for momentum, that's number one. 00:31:23.140 |
And then number two, you said that the momentum factor and the value factor are uncorrelated 00:31:34.520 |
So if they're negatively correlated and you had them both together in the same portfolio, 00:31:38.100 |
I mean, how does that reconcile or do you not have it in the same portfolio? 00:31:43.380 |
The simplest measure of momentum I know is still the one I used in my dissertation. 00:31:48.060 |
It is simply one year total return, leaving off some of the very recent returns. 00:31:54.140 |
I didn't even use daily data, so I left off the last month in my dissertation. 00:31:58.460 |
You don't really need to leave a whole month off. 00:32:02.620 |
That could be because we see some true reversal at the very short term, liquidity provision. 00:32:07.580 |
You know, if someone tries to trade a lot, they push a price and it's temporary price 00:32:10.860 |
pressure or they're just some microstructure issues. 00:32:14.580 |
If the last trade is at the bid, the price looks low and the momentum looks worse. 00:32:20.660 |
But if the next trade is half at the bid and half at the offer, half the time, on average 00:32:26.540 |
So it creates a little bit of an artificial contrarian strategy. 00:32:30.780 |
So I often shorten it to one year price momentum and leave off all the geeky stuff about having 00:32:35.900 |
to be sure that you don't accidentally get that contrarian part that may or may not be 00:32:39.540 |
real at the very short term, but call it simply one year price momentum. 00:32:44.620 |
I actually call this the fool strategy when I presented it to Fama, and I think I was 00:32:50.500 |
I knew he wasn't going to like the momentum strategy, so I might as well be self-deprecating 00:32:56.860 |
But on the face of it, you can't get simpler, right? 00:33:04.300 |
You can weight it in different ways, but buy a diversified portfolio of stocks with strong 00:33:09.060 |
one-year returns and sell a diversified portfolio of stocks with weak one-year returns on a 00:33:15.700 |
It doesn't matter which direction the market has gone. 00:33:18.620 |
Now, of course, I won't get into this, but just like value, you can do this in more complex, 00:33:27.840 |
perhaps better, perhaps over-engineered, we can always debate that ways. 00:33:35.060 |
You can look not at total return, but total return net of, say, a beta or multiple betas 00:33:45.660 |
There are a lot of different things you could do, and people do pursue these. 00:33:48.420 |
There are a lot of papers on tweaking the momentum factor, just like there is with value. 00:33:53.420 |
Same problem and/or opportunity, depending on your perspective, that there's no one way. 00:34:00.100 |
But I think the base way in academia is still this one-year price momentum. 00:34:07.980 |
The way I think about this is imagine your value strategy, long cheap, short expensive, 00:34:13.940 |
has a 5% average return and a 5% long-term volatility. 00:34:21.880 |
If they are uncorrelated, you take their volatility and you divide by the square root of 2. 00:34:28.380 |
So if you put half your money in each, you get a diversification benefit. 00:34:32.820 |
If they are negatively correlated, the volatility comes in even lower. 00:34:37.300 |
An implausible negative correlation, you know, if you thought they were negative one correlated, 00:34:46.260 |
To say I have two strategies that are perfect hedges, perfectly opposite, but both have 00:34:52.620 |
That would be no volatility ever and making money every day. 00:34:56.980 |
It's like going long the S&P 500 and short the S&P 500. 00:35:02.420 |
It's an absolute negative correlation, but you don't make any money. 00:35:07.500 |
But in real life, value and momentum, and times it's higher, times it's lower, but call 00:35:20.540 |
If you say it in English, what you're trying to buy, if you give, and I don't say you have 00:35:24.660 |
to give half your weight to each and there are other things besides value and momentum, 00:35:29.500 |
but if you gave half your weight to value and half your weight to momentum, the actual 00:35:33.580 |
stocks you're trying to buy, forget the quant stuff, just think about describing the stocks, 00:35:39.060 |
are cheap stocks that are not disastrous on momentum or even mildly cheap stocks that 00:35:47.660 |
I used to laugh and be kind of obnoxious when more traditional managers would all describe 00:35:54.380 |
their process as we're looking for value plus a catalyst. 00:35:59.060 |
And I used to roll my eyes and say, "You all say the same thing." 00:36:02.740 |
And then a friend who was an active stock picker said, "Don't you do value and momentum?" 00:36:09.540 |
And he said, "Don't you think you can describe that as value plus a catalyst?" 00:36:15.460 |
And I said, "Damn, I think I see where you're going with it." 00:36:18.740 |
So just the mechanical math is if you have two strategies that are not unrealistically 00:36:27.540 |
They're not perfect hedges, they just tend to move in the opposite direction, and both 00:36:32.620 |
I think that is both possible at a minus 0.5 correlation, and you create a better risk 00:36:38.300 |
Any time you create a better risk return, you can take that benefit through getting 00:36:42.480 |
basically the same average return at lower risk, or you can be more aggressive and try 00:36:48.020 |
to translate that into higher returns for similar risk. 00:36:53.360 |
But I think the idea that there are two strategies that can both make money and partially hedge 00:36:59.180 |
each other, not fully because that can't work, but partially hedge each other. 00:37:03.460 |
I just think is what's going on with value and momentum, and I think it's quite intuitive. 00:37:08.300 |
All is equal if the price goes up, the momentum gets better and the value gets worse. 00:37:18.020 |
They first screen for their value stocks, the stocks they want to buy based on their 00:37:24.240 |
value screens, and then they buy the ones that have good momentum. 00:37:30.640 |
So in other words, value first, and then momentum. 00:37:36.200 |
You know, I mean, I have great respect, of course, for the guys at Dimensional, Fama 00:37:40.680 |
and French still do a ton with them, and there's nobody in the industry I respect more. 00:37:48.020 |
Like I said, people of basically the same religion with small differences. 00:37:53.040 |
You get your 30 Years War, you get your Shia-Sunni kind of thing, where essentially we agree 00:37:59.840 |
on almost everything, but we disagree about this small point. 00:38:07.120 |
I am fond of saying momentum is very hard to reconcile with efficient markets. 00:38:14.760 |
My DFA using it as a screen, in my view, is very close to just using less of it than we 00:38:21.080 |
You're giving it a say over when you trade, but that's it. 00:38:23.920 |
You're not giving it any kind of equal status. 00:38:26.480 |
So I think it's just a point on the spectrum. 00:38:28.800 |
I think their philosophy started out more value-based. 00:38:31.960 |
I think they recognize that momentum has been a real phenomenon, and they don't want to 00:38:37.160 |
We want it to actively contribute, not to dominate value, but to actively contribute. 00:38:42.480 |
And you know, people who agree on a lot, who even like each other's processes and think 00:38:47.080 |
each are good, can differ with where on the spectrum you would be. 00:38:51.600 |
You know, if you and I both designed a process with similar data and similar empirical results, 00:38:56.000 |
we wouldn't necessarily come out with the same weights. 00:38:57.840 |
A screen is not technically the same thing, but I think it's pretty close to thinking 00:39:02.400 |
of it as them believing in momentum, but less than we do. 00:39:07.720 |
And I will say if they ever, you know, say something negative about momentum, I do make 00:39:14.040 |
You've already showed you believe in it, you just believe in it less than we do. 00:39:18.440 |
So I think we're more similar than we are different on this. 00:39:23.320 |
But yes, clearly we would give momentum closer, not necessarily precisely equal. 00:39:29.240 |
We don't have to weight these 50/50, but we would give momentum more weight than they 00:39:35.600 |
Well, we sort of got off track a little bit because we're actually... 00:39:42.440 |
But we haven't even gotten out of college yet. 00:39:45.000 |
I mean, you obviously got your PhD, so they accepted your dissertation. 00:39:50.240 |
Well, I'm more comfortable with the geek stuff than with the autobiography. 00:39:57.720 |
I started a dissertation on momentum when I got an offer from friends who were at Goldman 00:40:04.080 |
Sachs Asset Management starting up a... taking over. 00:40:08.360 |
It was close to a startup, but taking over a fixed income area. 00:40:12.600 |
Initially, I went for a summer, which was great. 00:40:15.840 |
They then said, "Why don't you come for a year and see if you like this as compared 00:40:22.600 |
And I still thought I wanted to be a professor at that point, but I did recognize that free 00:40:32.280 |
I ended up being there about a year and a half, was working on my dissertation at night. 00:40:38.040 |
That was an odd experience to be a portfolio manager, a trader, and a modeler in fixed 00:40:43.160 |
income during the day and go home and work on quant equity at night. 00:40:47.480 |
I was getting closer to... very close to being done. 00:40:50.720 |
Fam and friends were great about doing my dissertation from afar. 00:40:58.320 |
They wanted me to go on the academic job market. 00:41:03.440 |
PIMCO, the West Coast Asset Manager, wanted to start a quant research group. 00:41:11.480 |
It was still a relatively new thing, believe it or not, back then. 00:41:18.280 |
As an aside, the guy who took me out to lunch asked if sushi was okay. 00:41:23.520 |
And I had never had sushi and hardly ever had fish at that point in my life. 00:41:27.800 |
And being a cowardly 24-year-old, or whatever I was, something 24, 25, I said, "Yeah, sure. 00:41:36.160 |
And one point when he wasn't looking, I did spit my food into a napkin. 00:41:42.440 |
But I went to Goldman and said, "I'm thinking of doing this. 00:41:47.240 |
I'm trying to decide between academia and being a practitioner, and this seems to be 00:41:54.520 |
And to be brutally honest, and I feel bad, it was kind of PIMCO's idea, and we ran with 00:41:59.680 |
But Goldman swore to God they were looking to start the same group, and they were thinking 00:42:03.800 |
Again, I made the odd life decision not to live, first not to live in Palo Alto, and 00:42:12.120 |
I have managed to avoid good weather rather consistently in my career. 00:42:28.080 |
And I hired three people that gave me a budget for a four-person group. 00:42:32.000 |
Two were fellow PhD students at the University of Chicago. 00:42:41.320 |
We ended up both building direct quantitative processes to run client money. 00:42:49.700 |
Over the course of the next three years, we ended up running probably just about $7 billion, 00:42:56.000 |
about $6 billion in traditional kind of beat-the-benchmark, no leverage, no shorting, just regular stock 00:43:02.880 |
picking, though in a quantitative manner, and about $1 billion in long, short, more 00:43:10.880 |
To be honest, the hedge fund work, being less constrained, we think is a more pure version 00:43:19.080 |
When our factors beat the benchmark, we tend to get positive return in a similar based 00:43:29.040 |
This group, though, had much broader responsibilities than running money. 00:43:33.680 |
We were also in charge of pretty much anything quantitative. 00:43:39.880 |
Especially before we were running money, we were desperate for someone to give us a task. 00:43:44.160 |
So we were doing asset liability analysis, running efficient frontiers for their marketers, 00:43:50.400 |
and while there's absolutely nothing wrong with that, it was good stuff, it was really 00:43:54.520 |
awkward to be running a group that was running billions of dollars and growing and doing 00:43:58.300 |
well and be in charge of the graphics for the marketing people for other people's products. 00:44:04.680 |
Sometime, I think it was '96, I had one of my other partners, still to today, a guy named 00:44:11.120 |
David Cabellar, started working on me, particularly on the hedge fund side, saying, "You know, 00:44:18.400 |
You guys are at Goldman Sachs, but you buy all outside data. 00:44:22.380 |
You don't trade off Goldman Sachs as strategists. 00:44:26.800 |
And there'd been various hedge funds, booms and busts, but that was a boom time, and he 00:44:33.080 |
And I spent the better part of '96 doing my Hamlet imitation, "Should I do this? 00:44:41.800 |
Mid '96, I went to Goldman and actually said, "I'm thinking about doing this." 00:44:47.280 |
It was very straightforward, thinking of going off on my own. 00:44:50.960 |
They said, "What would it take to keep you and the whole team, not just me?" 00:44:54.560 |
I said, "Well, certainly money is part of it, and I won't pretend it wasn't. 00:45:00.240 |
We didn't even propose a deal where we'd make anything like if we ran our own successful 00:45:07.480 |
But we proposed something in the middle, some kind of sharing arrangement." 00:45:11.800 |
What was really odd was they certainly didn't jump at our first offer, but they met us a 00:45:16.880 |
decent part of the way on the more crass issue just of money. 00:45:21.820 |
But they were very insistent that we kept doing the support work. 00:45:25.480 |
I ended up saying, "Yes, Goldman Sachs does many things well, but retaining employees 00:45:30.840 |
they want to retain is something they are excellent at. 00:45:34.080 |
Certainly you are sitting with John Corzine, then president of Goldman Sachs, multiple 00:45:38.840 |
times being told how much they want to keep you." 00:45:47.660 |
I ended up, along with the rest of the group, deciding to stay. 00:45:51.280 |
Rick, do you ever have one of these giant decisions that as soon as you finally make 00:45:57.520 |
the decision, after agonizing, you get a wave of relief, partly just because it's over, 00:46:07.400 |
What was not obvious when you were agonizing seems obvious after the fact. 00:46:11.040 |
You're like, "Well, yeah, I don't know what I was agonizing about." 00:46:18.080 |
About a month later I was still going, "We should be doing this on our own." 00:46:24.280 |
David again, he was the Mephistopheles, the tempter in this story. 00:46:29.720 |
About a month into it, he and I were talking and I said, "Is that still an option?" 00:46:39.960 |
I gave away the whole ballgame at that point. 00:46:42.960 |
We agonized for a few more months, but at the end of the year we did decide to go and 00:46:48.800 |
The first time you try to leave when you're someone they want to keep, you get a full 00:46:57.480 |
The second time you do not get the charm offensive. 00:47:00.500 |
You get quite the opposite, largely because when you come back the second time, they know 00:47:07.480 |
The partner I reported to was not happy with me. 00:47:13.880 |
One of the scariest things in my life was telling him I was resigning. 00:47:21.400 |
I played psych-up music on my Sony cassette Walkman in my office before I went down to 00:47:34.400 |
You ended up creating an incredible powerhouse, AQR. 00:47:40.240 |
By the end of last year, you had $186 billion in assets under management. 00:47:48.280 |
Clearly you made the right decision, and of course to be congratulated. 00:48:00.560 |
I have just a couple more questions from the Bogleheads, and I've asked you some already, 00:48:06.320 |
This has to do with things that you've wrote about over the years. 00:48:09.480 |
One of the things you wrote about was the 60/40 portfolio, and is it a good solution 00:48:17.200 |
Just realize that a lot of investors invest along the 60/40. 00:48:26.560 |
Well, first of all, pretty much ever since we and others have been saying that 60/40 00:48:31.880 |
just chugs along, some wild volatility at times. 00:48:35.800 |
Mid-March this year, it didn't seem like it was chugging along, but on net, it's continued 00:48:42.480 |
My issues with 60/40, there are two, a long-term one and a conditional one on where we are 00:48:50.960 |
The long-term one is there's nothing wrong with it. 00:48:53.560 |
I think it's great to have that as a core of your portfolio. 00:48:56.720 |
There's no magic to the particular weights of 60/40. 00:49:01.360 |
Of course, like everything else, we pick kind of a benchmark, and then it gets holy over 00:49:07.120 |
I don't think 65/35 or 55/45 is going to be any great sin, but the general idea of being 00:49:15.000 |
diversified across stocks and bonds as a core is great. 00:49:19.400 |
We do think you could do better, both in a traditional sense, you know, all the classic 00:49:23.640 |
things we talk about, being global, at least to some extent, you can still have a home 00:49:28.080 |
bias, but 60/40 is often thought of as the domestic U.S. portfolio. 00:49:34.800 |
There are other ways to make it better, but if you believe that there is a value premium, 00:49:40.080 |
there is a momentum premium, then you can just view that as another investment that's 00:49:47.120 |
We do think long-term you can at least somewhat improve the risk-adjusted return or the total 00:49:53.040 |
return if you choose to take enough risk of 60/40. 00:50:04.000 |
We always, thank God, we caution, don't use this to time the market, don't use this to 00:50:08.520 |
make a one-year forecast, but stocks, you know, pick your favorite measure. 00:50:13.640 |
I remember when the Shiller CAPE was a brand-new baby in 1996, but it's become kind of the 00:50:18.760 |
lingua franca in talking about how expensive the stock market, just like any valuation 00:50:23.680 |
measure, it's not the only one by any means, there are a whole set of them. 00:50:27.380 |
The Shiller CAPE, I think last time I looked, just a few days ago, it was about 32, it hit 00:50:37.040 |
So if you graph it back, you know, 100 years, the only way it looks reasonable is if you 00:50:47.800 |
If you compare it to the whole series, it's somewhere in the, again, don't hold me to 00:50:52.120 |
the precise number, the 92nd percentile expensive versus history. 00:50:57.200 |
And statistically, it's actually hard to say strong things about long-term returns because 00:51:02.200 |
you don't get to observe enough, let's call it 10-year or longer periods. 00:51:07.900 |
But what we do get to observe seems to fit with intuition. 00:51:12.680 |
When you buy stocks more expensive, the average return is lower going forward and vice versa. 00:51:18.680 |
So therefore, we'd expect positive returns out of stocks. 00:51:21.440 |
We're not people who are forecasting giant mean reversion and a crash, but we do forecast 00:51:26.240 |
a lower risk premium for long-term investors from here. 00:51:30.360 |
And this is even easier because it fits intuition even more so. 00:51:36.560 |
When bonds are selling for near zero real yield against economists' forecast of long-term 00:51:41.680 |
inflation, not many of us need great convincing that they're probably, probably from here 00:51:48.440 |
in the next, call it 10 years, going to make less on their bonds than history in a real 00:51:56.640 |
If stocks are less than normal and bonds are less than normal, then you could do some very 00:52:02.200 |
complicated math, this is stochastic calculus. 00:52:05.440 |
You take 60% of your estimate for stock returns and you add it to 40% of your estimate for 00:52:11.400 |
bond returns, and you get your estimate for 60/40. 00:52:23.680 |
And that, you know, I prefer real because it just adjusts for the environment, but, 00:52:28.960 |
you know, that comes out to about 1.5% real right now. 00:52:34.000 |
History is more like 5%, meaning if you could buy a diversified portfolio at a low transactions 00:52:41.800 |
cost and a low fee, that's a big if, because there's a long part of history where you really 00:52:47.380 |
But if you could, you got 5% real just for showing up. 00:52:52.400 |
We think you get 1.5, 2% real just for showing up today. 00:52:59.200 |
You can make it negative if you want to forecast big mean reversion, but that's market timing. 00:53:03.800 |
That's saying we know these prices are going to drop. 00:53:09.760 |
If the prices drop, it'll be even worse, but I'm negative enough at 1.5, 2%. 00:53:17.120 |
If you do have alternatives that can make a portfolio better on average, I think they're 00:53:21.720 |
more important when the core portfolio is offering you less. 00:53:25.160 |
Let me ask a question about international stocks because I look at the international 00:53:31.240 |
market and I look at the industry group weightings of ex-U.S. or international stocks versus 00:53:37.760 |
U.S. stocks, and I see very different industry groups. 00:53:49.720 |
It's like 50 years ago, we did everything in this country. 00:53:52.360 |
Now we import all our desks and computers and just about everything I'm looking at right 00:53:57.920 |
But my point is that if you look at the valuations of international stocks, just use the Vanguard 00:54:08.200 |
And I didn't know I was looking at the Vanguard Total International Index Fund. 00:54:12.520 |
All I was looking at was the price to earnings ratio, the price to book ratio, return on 00:54:18.480 |
I thought I'd be looking at a mid-cap value index. 00:54:21.920 |
And then lo and behold, you pull the cover off and it's the international market. 00:54:26.720 |
Can't people who are doing, say, a 60/40 portfolio, and to your point that a lot of people are 00:54:31.320 |
thinking about just U.S. stocks, can't they diversify or maybe get some of the value premium 00:54:37.720 |
that you're talking about as simply as adding, instead of having all U.S., having 40% U.S. 00:54:48.520 |
I would say you really don't have to choose one or the other. 00:54:55.240 |
International versus the U.S., even when international is cheap, is not highly correlated at all 00:55:00.920 |
to when value works as we do it within industries for picking individual stocks. 00:55:08.240 |
The basic math of portfolios says you should do everything you believe in that's diversifying. 00:55:13.960 |
You should just have a high standard for what you believe in. 00:55:15.880 |
So you don't end up doing a ridiculous amount. 00:55:19.000 |
But I don't think these are necessarily competitive solutions. 00:55:24.640 |
You could do half of what you would have done over each and have less risk of disaster if 00:55:32.960 |
I do think even if you adjust for the industry, a long, long time ago, we wrote a paper in 00:55:38.840 |
the mid '90s showing that cheap countries with good momentum can outperform expensive 00:55:46.080 |
countries with bad momentum if you just pretend the index is a single stock and add up the 00:55:54.560 |
But years later, we did notice exactly what you are talking about, that of course you 00:55:59.200 |
can get some very different industry components, particularly in some of the smaller countries 00:56:03.560 |
where you don't have a very large cross-section. 00:56:05.840 |
You go to Belgium and you get a ton of financials. 00:56:09.240 |
You go to Australia and you get a lot of resource stocks. 00:56:12.800 |
So this gets really geeky, and this is your fault, Rick, that I'm doing this. 00:56:19.000 |
But years ago, we modified what we do in comparing countries. 00:56:23.520 |
We still compare them straight out against each other, as you were doing, but we also 00:56:27.200 |
do something where we look at a country's industry composition. 00:56:32.020 |
We look at the global, including the U.S., total cap-weighted global industry, get its 00:56:37.160 |
valuation, forecast based only on its industry composition what we think the valuation ratio 00:56:44.840 |
of that country would be if everything was selling at an average for the industry, and 00:56:49.640 |
then call it cheap or expensive only if it's lower or higher than that forecasted price. 00:56:59.000 |
Remember earlier I said we take our value bet without taking a whole lot of industry 00:57:10.980 |
But we found that makes the country betting a little higher of a risk-adjusted return, 00:57:17.360 |
We give weight to both, and both will say, even adjusting for industries, we think the 00:57:25.780 |
Like everything else, value alone, particularly for big decisions like U.S. versus global, 00:57:36.020 |
And we do think it's a smart bet to have some outside the U.S., partly because we always 00:57:41.180 |
think that, because we like diversification, but also conditionally, as you're saying, 00:57:46.020 |
because it has more of a value tilt than it normally does right now. 00:57:49.100 |
Well, since you agreed with me on the last point and made me look very smart, I think 00:57:56.780 |
You're afraid one more question, and I'll disagree, and it'll all collapse. 00:58:02.820 |
That's George Costanza, has learned that if he ever says something smart in a meeting, 00:58:06.780 |
he excuses himself from the meeting immediately, and says thank you, and just claims victory. 00:58:13.580 |
Cliff, thank you very much for being our guest, and we really appreciate your insights. 00:58:17.620 |
It's been a real pleasure having you on the show. 00:58:24.360 |
This concludes Bogleheads on Investing, podcast number 27. 00:58:29.620 |
Join us each month to hear a new special guest. 00:58:32.940 |
In the meantime, visit bogleheads.org and the Bogleheads Wiki. 00:58:38.020 |
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