Can efficient markets and behavioral finance both be right, and when does market efficiency break down?
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Rational and behavioral finance reconciled
State when rational finance applies and when behavioral anomalies arise, and how the adaptive markets hypothesis combines the two, with autumn 2008 as the example of extreme stress.
Heuristics formed by feedback
Compute the 2,000,000 outfits and 23.1 days for the wardrobe, then record the Superman jacket as a rule of thumb set by negative feedback and the movie star as context dependence.
Implications for risk premia and strategies
List the implications: an unstable, nonlinear risk–reward relation, time-varying risk premia, arbitrage opportunities that come and go, strategies that wax and wane, and theory covering perhaps 80% to 90% of markets.