Everyday financial decisions are the product of diverse factors, including instinct, habit, emotion, reason, and social interaction. Psychologists have long aspired to unravel the determinants of intuitive judgment and choice. Slowly but surely, they have identified various psychological mechanisms that cause predictable decision biases. This survey puts special emphasis on behavioral research in finance that investigates information overload, emotion, social influence, and ambiguity aversion. It also discusses selected cognitive models that attempt to integrate the way individuals interpret and act upon information. In general, behavioral research casts serious doubt on the validity of some of the key insights of mainstream finance such as portfolio theory, the positive risk-return trade-off, and efficient markets.
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