Students are introduced to a quantitative approach to evaluating the decisions of firms and individuals. ¿ Stress is placed on logic and analytical approaches to problems such as portfolio choice or capital structure. ¿Students learn both to draw inferences from the prices observed in markets and also to apply the normative standards of present value rules, diversification, and asset pricing theories. ¿The role of reputation and ethics in the development of trustworthy markets is also studied.