A simulated portfolio deliberately based on stale price data — a Rip Van Winkle index fund — has both substantially higher performance and lower volatility than a portfolio that uses up-to-date cap weights. This holds true over the past 67 years in the United States and over shorter...

Factor returns, net of changes in valuation levels, are much lower than recent performance suggests. Value-add can be structural, and thus reliably repeatable, or situational—a product of rising valuations—likely neither sustainable nor repeatable. Many investors are performance chasers who...

In our paper — “How Can ‘Smart Beta' Go Horribly Wrong?” — we show, using U.S. data, that the relative valuation of a strategy (in comparison with its own historical norms) is correlated with the strategy's subsequent return at a five-year horizon. The high past performance of many of...

In a provocative paper, Santa-Clara and Valkanov (2003) present evidence that stock market returns are much higher under Democratic presidents than Republican presidents. Their work was updated by Pastor and Veronesi (2017), who find that the effect is even stronger when the data are extended...

Factor investing has failed to live up to its many promises. Its success is compromised by three problems that are often underappreciated by investors. First, many investors develop exaggerated expectations about factor performance as a result of data mining, crowding, unrealistic trading cost...