SIMPLYSTATED
April 2015
Calling the Turns:
Why Market Timing Is So Hard
by Philip Lawton, Ph.D., CFA
The stock market is cyclical, and any investor who
market may have mispriced it. Similarly, by comparing
could call the turns—buying when prices are lowest
the market’s current cap-weighted price/earnings to
and selling when they are highest—would make a
the long-term average, analysts can judge whether,
fortune. But only a fortuneteller would say, “The peak
and by how much, the market as a whole is misvalued.
will arrive next Tuesday morning,” and like the rest of
us, she’d be guessing (and almost certainly guessing
But DCF analysis, P/E multiples, and other theoretically
wrong). The facts are clear—most actively managed
sound valuation measures cannot tell us how much
equity mutual funds underperform the market.
Even
more misvalued the market will get nor can they
worse, most individual investors underperform the
explain the wild swings we’ve experienced in the two
funds they invest in: their money-weighted returns—
equity market cycles in the last 15 years.4 As Figure 1
the rates of return they actually earn—are
illustrates, the stock market seems to go too far in
preponderantly lower than the time-weighted returns
both directions—up and down—and the amplitude of
that the funds report (Hsu and Viswanathan, 2015).
these movements cannot be satisfactorily explained
1
within the cool analytical framework of the standard
Investment managers’ underperformance relative to
model.
their benchmark generally results from unfortunate
decisions in one or more of three areas: market timing,
Empirical research has established that sooner or later
sector weighting or factor exposures, and stock
stock prices revert toward their long-term averages.
selection.2 The practical reality is that timing is
There is also strong evidence that the value premium
integral to all aspects of investment decision making.
is mean reverting (Hsu, 2014). If the market rises or
Allocating funds across sectors, setting factor
falls to an extreme level despite a natural tendency to
exposure targets, and identifying attractively priced
self-correct, then countervailing forces must be at
stocks all have an element of market timing. Mutual
work.
fund investors’ underperformance relative to the active
funds they hold is simply the result of their own
One hypothesis is that many market participants view
inopportune purchases and redemptions.
mental effort as an avoidable transaction cost.
Disinclined to gather and analyze solid information
If it’s all in the timing, why is it so hard to get the timing
about the stocks that interest them, they are carried
right?
along by the crowd, trading on momentum and noise.
The Market in Theory
In addition to this kind of indolence or inertia, Daniel
The standard model of investment management
Kahneman (2011) and others have described a number
equips portfolio managers and traders reasonably well
of cognitive biases and patterns of emotionally
to determine if an individual stock is fairly valued.
charged behavior that affect individuals’ choices under
Most investment professionals use discounted cash
uncertainty—the selling and buying of securities being
flow (DCF) analysis to estimate a stock’s inherent
an excellent example of such an activity.
They include
worth, and so to judge whether it is mispriced. With
overconfidence and the illusion of control,5 mental
a handle on a stock’s true value, an investment
accounts, availability cascades, loss aversion,
professional can also observe the extent to which the
overreacting to news, and herding, among others.
3
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Figure 1. S&P 500 Index Monthly Price Levels (January 2000–March 2015)
2100
S&P 500 Index Closing Price
1800
1500
1200
900
600
S&P 500 Closing Price
Average
Source: Research Affiliates using data from FactSet.
The field of neuroeconomics has also contributed much
“Predominantly,” Smith (2009, p. 157) writes, “both
to our understanding of the autonomous brain, the old
economists and psychologists are reluctant to allow
lizard brain, which leaps to conclusions while our
that naïve and unsophisticated agents can achieve
conscious minds are still deliberating. The process of
socially optimal ends without a comprehensive
reasoning, it appears, is often rationalizing choices we
understanding of the whole, as well as their individual
may not know we’ve already made (Zweig, 2007).
The
parts, implemented by deliberate action.” But in Smith’s
insights into decision making that we’ve gained from
account, personal exchanges gave rise to impersonal
behavioral finance and neuroeconomics go a long way
markets which serve to facilitate the specialization that
toward explaining investors’ actions and reactions when
creates wealth. Smith demonstrates that in a diverse
the outcome is in doubt.
set of circumstances, such as the airlines’ response to
Beyond Behavioral Finance
Given the behavioral view of investors’ practical
decision-making processes, two promising ways of
thinking about how markets really work are Vernon
Smith’s concept of ecological rationality and Andrew
Lo’s adaptive markets hypothesis.
trust games, the interaction of individuals with partial
Smith, the experimental economist who shared the
2002 Nobel Prize in Economic Science with Kahneman,
distinguishes between constructivist and ecological
rationality. The former involves the intentional use of
reason to analyze the given and to advocate a course
of action.
(The standard model of investment
management is a sterling product of constructivist
rationality.) Ecological rationality, in contrast, emerges
in institutions, such as markets, through human
interaction rather than by human design.
© Research Affiliates, LLC
deregulation, FCC spectrum auctions, and a variety of
knowledge leads in due time to near-equilibrium
solutions.
Lo (2004, 2005) invokes pertinent findings of
behavioral finance and neuroeconomics in his effort to
develop a more realistic framework than the standard
model. He also introduces key concepts from
evolutionary psychology—competition, adaptation, and
natural selection—and reintroduces the classic notion
of bounded or approximate rationality proposed by
Herbert Simon. Simon’s idea crucially takes into account
“the simplifications the choosing organism may
deliberately introduce into its model of the situation in
order to bring the model within the range of its
computing capacity” (Simon, 1955, p.
100). For example,
attempting to maximize the expected payoff from an
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SIMPLYSTATED
action is a computationally intensive exercise. One of
the simplifications Simon describes is “satisficing,”
more modestly requiring only that the benefit exceed
some threshold.
Thanks to Kahneman, Smith, Lo, and many others, our
understanding of the ways investors think and markets
function is richer and more sensible than it was when
the best minds of the time constructed the standard
investment model. But these theoretical advances still
don’t solve the active investor’s conundrum: when to
buy and sell in strongly trending markets.
Blue Sky Solutions
So, where will the solution come from? Let’s think blue
sky.
Among the unfettered solutions that come to mind,
one approach might be modeling the actions and
reactions of distinct groups (Lo’s “species”) whose
members generally employ specifiable decision rules,
but are subject to social influences and cognitive biases.
Alternately, the industry might train its immense
technological firepower on the markets themselves in
a search for deep structures or path-dependent vectors
that signal a change in direction: technical analysis with
Cray supercomputers.
In either case, the analytical techniques that ultimately
crack the code of market timing may originate in fields
far removed from finance and economics—information
theory, for example, or the study of complex networks.
Recall that “Brownian Motion in the Stock Market,” an
article written by the physicist M.F.M. Osborne (1959)
and published in a nonfinancial journal, contributed to
Endnotes
1. According to the SPIVA Scorecard compiled by S&P
Dow Jones Indices, for periods ended December 31,
2014, 76.25% of actively managed U.S.
large-cap equity
funds underperformed the S&P 500 for 3 years, 88.65%
for 5 years, and 82.07% for 10 years.
2. For an approach to performance attribution analysis that
isolates the impact of tactical asset allocation in factor
investing (i.e., timing the cyclicality of risk premiums),
see Hsu, Kalesnik, and Myers (2010) and Hsu and Shakernia (2013).
3. Cornell and Hsu (2015) hold that the investment professionals to whom end investors delegate decisionmaking authority use DCF analysis so prevalently that
their discount models are likely both to drive prices and
to determine the cross-section of expected returns.
© Research Affiliates, LLC
the random walk theory of prices (Bernstein 2005, p.
103, and Fox, 2009, pp. 64–67).
And Back to Earth
The stock market’s turning points, as well as the
valuation peaks and troughs of individual stocks,
increasingly appear to be driven more by mass
psychology than by sober professional judgment based
on disciplined valuation techniques. In fact, the active
investor’s conundrum is such a challenge that many
investors have chosen passive investing—simply
removing timing decisions from their purview.
But there
is strong evidence that the popularity of passive
investing tied to prominent cap-weighted indices is
actually associated with higher return correlations
among stocks and, therefore, higher systematic equity
market risk (Sullivan and Xiong, 2012).
At this juncture, we must acknowledge that financial
theory does not provide clear and timely trading signals.
Calling the turns is hard because we don’t have a
mechanics of mean reversion. Our best theories—
including behavioral finance, neuroeconomics,
experimental economics, and evolutionary psychology—
do not enable us to foresee the sudden exogenous shock
that will trigger a reversal, or to sense when a gradual
change in investors’ attitudes will reach the tipping
point. Not even the most skilled and experienced asset
allocators can pinpoint in advance the onset of a
reversal.
Most of us are well advised not to attempt
market timing. The soundest plan is to choose a strategy
that suits our investment objectives and risk tolerance—
potentially including a disciplined smart beta strategy
that systematically rebalances over time—and to stick
with that choice for the long term.
4.
5.
6.
Nor does the standard model account for the sheer
volume of non-algorithmic stock market trades.
The novelist Italo Svevo satirized the illusion of control
when he described a fictional character’s apparently
successful effort to regulate the stock exchange on
behalf of a late friend’s family: “I don’t know anyone who
has ever been able to tolerate similar exertion for fifty
hours. Every shift in price I recorded, brooded over, and
then (why not say it?) mentally urged shares forward,
or held them back, as best suited me, or rather my poor
friend.
Even my nights were sleepless.” (Svevo 2003, p.
388.)
Lo (2004) gives examples of “species” in the economy,
including pension funds, retail investors, market makers,
and hedge fund managers.
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References
Bernstein, Peter L. 2005. Capital Ideas: The Improbable Origins
of Modern Wall Street. Hoboken, NJ: John Wiley & Sons.
Lo, Andrew.
2004. “The Adaptive Markets Hypothesis:
Market Efficiency from an Evolutionary Perspective.” Journal of
Portfolio Management, vol. 30, no.
5 (30th Anniversary):15–29.
Cornell, Bradford, and Jason Hsu. 2015. “The Self-Fulfilling
Prophecy of Popular Asset Pricing Models,” Journal of
Investment Management (forthcoming).
———.
2005. “Reconciling Efficient Markets with Behavioral
Finance: The Adaptive Markets Hypothesis.” Journal of
Investment Consulting, vol. 7, no.
2:21–44.
Fox, Justin. 2009. The Myth of the Rational Market: A History
of Risk, Reward, and Delusion on Wall Street.
New York:
HarperCollins.
Osborne, M.F.M. 1959. “Brownian Motion in the Stock
Market.” Operations Research, vol.
7, no. 2 (March/
April):145–173.
Hsu, Jason. 2014.
“Value Investing: Smart Beta versus
Style Indexes,” Journal of Index Investing, vol. 5, no. 1
(Summer):127-135.
Simon, Herbert.
1955. “A Behavioral Model of Rational
Choice.” Quarterly Journal of Economics, vol. 69, no.
1
(February):99–118.
Hsu, Jason C., Vitali Kalesnik, and Brett W. Myers. 2010.
“Performance Attribution: Measuring Dynamic Asset
Allocation Skill.” Financial Analysts Journal, vol.
66, no. 6
(November/December):17–26.
Smith, Vernon L. 2009.
Rationality in Economics: Constructivist
and Ecological Forms. Cambridge: Cambridge University Press.
Hsu, Jason C., and Omid Shakernia. 2013.
“A Framework for
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vol. 3, no. 4 (Spring):64–72.
Hsu, Jason, and Vivek Viswanathan.
2015. “Woe Betide the
Value Investor.” Research Affiliates (February).
Kahneman, Daniel. 2011.
Thinking, Fast and Slow. New York:
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Sullivan, Rodney N., and James X. Xiong.
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Trading Increases Market Vulnerability.” Financial Analysts
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2 (March/April):70–84.
Svevo, Italo. 2003. Zeno’s Conscience.
Translated by William
Weaver. New York: Vintage Books.
Zweig, Jason. 2007.
Your Money and Your Brain: How the New
Science of Neuroeconomics Can Help Make You Rich. New York:
Simon & Schuster.
ABOUT THE AUTHOR
Philip Lawton is responsible for content marketing. Earlier in his career he was head of the Certificate In Investment Performance
Measurement (CIPM®) program at CFA Institute; a vice president at State Street Investment Analytics, where he managed client
service for the Independent Consultants Cooperative; a vice president at Citibank, where he was responsible for providing performance
measurement reports to U.S.
master trust and custody clients; a second vice president and fixed income portfolio manager at The
Travelers; and director of cash flow forecasting and liquidity management at Aetna Life & Casualty.
Philip earned his bachelor’s, licentiate, and Ph.D. in philosophy in the French-speaking section of the Catholic University of Louvain,
Belgium, and an MBA degree at Northeastern University.
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