.S. household survey, we measure ambiguity aversion using custom- designed questions based on Ellsberg urns. As theory predicts …

.S. household survey, we measure ambiguity aversion using custom- designed questions based on Ellsberg urns. As theory predicts …

We develop a normative theory for constructing mean-variance portfolios robust to model misspecification. We identify … and a "beta'' portfolio that depends on factor risk premia, which when combined give mean-variance efficient portfolios …

overconfident about the signal. We find that, because overconfident traders introduce an additional source of risk, rational … bonds are an essential accompaniment of equity investment, as they serve to hedge this sentiment risk …