Abstract: Summarises some of the successes of behavioural finance and shows how this field can inform the analysis of broader questions in economics. It begins with some of the open issues in security valuation. It then moves to the study of real consequences of financial markets on corporate finance and real investment, and evaluates the role of public policies. It concludes by enumerating 20 broad problems in behavioural finance.

Keywords: behavioural finance, corporate finance, finance, financial markets, investment, public policy, security prices,