- A large body of literature holds that the equity market premium is countercyclical and, using valuation ratios, is predictable.
- The investor return gap persists, despite strong evidence that factor performance is mean reverting, because investors use the manager selection process for alpha timing.
- Contrarian strategies enable stalwart investors to overcome the institutionalized behavioral biases that depress long-term returns.
Substantial evidence supports factor return predictability, yet evidence also indicates that investors are not reaping, to the greatest extent possible, the excess returns commensurate with such knowledge. A significant contributing factor to suboptimal investment results is the institutionalization of individual investor behavioral biases related to the confusion of short-term performance and manager skill as well as misplaced blame for poor outcomes. The good news for individual investors is—being free to act outside of institutional decision-making processes—they are more apt to make decisions that allow them to benefit from long-term mean reversion in factor returns.
Are Factor Premiums Mean Reverting?
Increasingly, researchers are finding evidence that factor performance is mean reverting. A large body of literature argues that the equity market premium is countercyclical and predictable, using valuation ratios. The empirical literature shows that dividend yield and CAPE (cyclically adjusted PE) can predict future equity market returns.1 Put simply, when the equity market rallies for an extended period of time, its CAPE ratio becomes meaningfully higher than the historical average. A common interpretation of a high CAPE is that the market is expensive. When a high CAPE mean reverts toward the historical norm, the resulting forward return for the equity market falls meaningfully below average.2
Evidence is also mounting that other factor premia, such as value and low beta, are also time varying and predictable.3 Table 1 reports for a number of popular factors the one-year-ahead predictive regression using the valuation spread as the predictive variable. The t-stat and the R2 support the claim of predictability based on mean reversion. For example, when value stocks are substantially cheaper than growth stocks—meaning the spreads in valuation ratios are abnormally wide—a reversion toward the norm would result in above-average value stock outperformance.
[drizzle]These empirical observations have obvious implications for investors allocating to factor exposures and the smart beta products that house them. It suggests that successful market timing could be possible! First, however, it is useful to understand the source of this return predictability. As it turns out, timing is possible, in part, because most of us time very poorly, and there are attributes, baked into our institutions, which ensure we will continue to time poorly!
Why Is Next-Period Factor Return Related to Current Valuation?
Short-term momentum and long-term mean reversion are features of almost all return data examined by researchers. Behavioral explanations help paint a compelling and intuitive narrative for the existence of these features. Overextrapolation of past performance combined with herding results in short-term momentum in securities prices. The eventual overshooting in prices then gives way to long-run mean reversion.
The same occurs for the various investment styles captured in factor portfolios and smart beta strategies. In the context of the modern investment mandate process, we can easily understand this boom-and-bust cycle for factor premiums. Most investors adopt a process for evaluating managers and investment strategies based on the past two to three years of relative performance versus a capitalization-weighted market benchmark.4 Strong past performance attracts strong inflows, and weak performance leads to outflows. For example, in the years since the global financial crisis and subsequent European debt crisis, quality and low beta have outperformed as investment styles.
Managers and smart beta strategies with these style biases have outperformed and attracted flows. These flows have, in turn, led to additional price appreciation for low-beta and high-quality stocks as the outperforming managers plow subscription funds into the stocks that they currently own. On the flip side, strategies with a value bias have underperformed and suffered outflows. Redemptions then necessitate the selling of value stocks, which further depresses prices. Figures 1 and 2 show how the valuation (price-to-book) ratio for low-beta and value stocks fluctuates over time, with low-beta stocks trading at the top of the valuation range and value stocks trading near its bottom.
The procyclical or trend-chasing allocation accentuates the underlying economic shocks to various investment styles as flows push valuations. In the short run, this results in self-fulfilling prophecy and momentum. In the long run, it becomes self-defeating and gives rise to mean reversion. This investor pattern contributes to a predictive relationship between the valuation multiple and future return. Frazzini and Lamont (2008) and Hsu, Myers, and Whitby (2015) find evidence that mutual fund flows predict negative future fund performance. Figure 3 shows that mutual funds with high inflows have low next-period relative performance. Figure 4 shows that the investor return gap, which is driven by the negative correlation between flows and subsequent returns, is large across all fund categories. This pattern is observed for pensions as well, although to a smaller degree.
Alpha Is Zero-Sum and So Are Flows!
It is important to remember that flows are zero-sum, meaning that for every seller of a cheap value stock a buyer must exist on the other side of the trade. It is thus important to be clear about the investor cohorts being examined in the research. Most studies are based on mutual fund investor flows, with a few studies examining pensions and their allocations to institutional asset managers. The emerging evidence is that this particular investor cohort has earned negative dollar-weighted alphas on a gross-of-fee basis, as indicated by their large negative return gaps versus a buy-and-hold strategy. These negative return gaps are driven primarily by trend-chasing allocation decisions, which have largely been institutionalized by the investment industry through its hiring and firing decisions, the majority of which are based on recent performance. Given the poor performance of the adopters of modern investment selection practice, it is not unreasonable to label mutual fund investors and pensions as naïve flows, which are supplying dollar alphas to others.5
Ironically, the pursuit of positive alpha, which leads to the regular switching of investment strategies and managers, is the very reason why mutual fund investors and pensions have earned negative alpha. Investors should realize that the widely followed selection practice is technically an attempt to time manager alpha. Figure 5, using institutional manager data from eVestment, shows that managers who underperformed in the previous five years tend to outperform in the next five years, while the outperformer tends to then underperform. As manager styles come in and out of favor, the hiring and firing of managers is akin to timing the returns of style factors. That procyclical timers, such as mutual fund investors and pensions, do poorly is the very reason why countercyclical factor returns persist.
Delegation of Investment Decisions Results in Massive Failures
Individual investors delegate investment decision making to mutual fund managers. Pensions delegate investment decisions to institutional asset managers. Delegation is supposed to prevent less sophisticated investors from being the proverbial pig, slaughtered by better-informed bulls and bears. Putting aside