New Book Shines Light On Momentum

Momentum is the tendency for assets that have performed well (poorly) in the recent past to continue to perform well (poorly) in the future, at least for a short period of time.

This is a big problem for the efficient markets hypothesis, as there’s no coherent risk-based explanation for momentum’s performance. Not only has there been a sizable momentum premium in stocks (larger even than the market beta premium), but its Sharpe ratio has been higher.

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