"The authors discuss in a clear and motivated way some essential problems such as incompleteness, market viability or dissemination of information. Graduate students in economics will find this textbook a valuable supplement to the extensive literature on financial engineering." Christian Gourieroux, Center of Research in Economics and Statistics in France"Given the explosive growth of the finance literature, even well-trained microeconomists may feel left behind. They should be grateful to Demange and Laroque for giving them such a clear and unified picture of how financial instruments allocate risk in the economy." Bernard Salanie, Columbia University