We show that the probability of risk parity beating any other portfolio is more than 50 percent. We also prove that if portfolio performance is measured by Sharpe ratio, risk parity is the only maximin portfolio when (1) all assets' future Sharpe ratios are greater than an unknown constant and...

We show that the profitability of time-series momentum strategies on commodity futures across their entire history is strongly sensitive to the starting day. Using daily returns with 252-day formation periods and 21-day holding periods, the Sharpe ratio depends on whether one starts on the first...

We analyze a unique, comprehensive, multi-decade dataset of all communications with clients by a boutique investment advisory and investment management firm to explore the behavior of individuals involved in financial decision making. We propose and test a theory of self-regulation to explain...

Does better performance lead to more assets? We examine nearly 30,000 mutual funds to determine the effect that a funds outperformance relative to its peers has on the funds later asset size. We find that a fund that earns ten percent more than the size-weighted average of its peers in its style...

In the current environment of financial distress, many governments are likely to soon become major holders of financial assets, but the policy debate focuses only on the likelihood and extent of short-term market stabilization. This paper shows that government intervention and propping up are...

We solve two "unsolvable" (teyku) problems from the Talmud that had remained unsolved for about one and a half thousand years. The Talmudic problems concern the implied decision-making of farmers who have left some scattered fruit behind, and the alleged impossibility of knowing whether they...

Drawing on and extending an estate allocation algorithm of 12th century philosopher Moses ben Maimon, we show how “Maimonides Risk Parity” can link together the equal weighted, market capitalization weighted, and risk parity portfolios in a unified, elegant, and concise theoretical...

How can you tell if a particular sports dataset really adds value? The method introduced in this paper provides a way for any analyst in almost any sport to determine the additional value of almost any dataset. Applying the method to NBA betting markets with a standard dataset available publicly...

We introduce a novel Skills Plus Minus (“SPM”) framework to measure on-court chemistry in basketball. First, we evaluate each player's offense and defense in the SPM framework based on three basic categories of skills: scoring, rebounding, and ball-handling. We then simulate games using the...

A multi-billion-dollar, multi-year discrepancy between two identical share classes of Hong Kong and Shanghai Banking Corporation (HSBC) did not suffer from traditional external limits to arbitrage such as transactions costs and risk measures. One possible explanation is that self-imposed limits...