I derive the term structure of short selling costs using the put-call parity relationship. The shape is determined by informed investors' beliefs of when negative information will enter the market and correct the overpricing. I show that forward costs predict future costs and stock returns,...

We examine the profitability of hedge fund equity short sales. We identify opening and closing trades by combining data on funds' transactions and holdings. Short sales covered within five trading days are highly profitable, but those kept open longer are not. Some of the profitability is due to...

We construct mean-variance optimized currency portfolios and analyze the time- series variation of the conditional Sharpe ratio. Returns, volatility and skewness are predictable. Market timing – i.e., trading more (less) aggressively when the conditional risk-return trade-off is more (less)...

Individual investors often invest actively and lose thereby. Social interaction seems to exacerbate this tendency. In our model, senders' propensity to discuss their strategies' returns, and receivers' propensity to be converted, are increasing in sender return. A distinctive implication is that...