Knowledge beliefs and economics pt. 1. Knowledge and beliefs in the history of economic analysis : Marshallians Austrians and Walrasians pt. 2. Knowledge and beliefs in game theory pt. 3. Beliefs and decision theory pt. 4. Knowledge beliefs and cognitive economics pt. 5. Agents communities and collective beliefs This book surveys how economists engage with knowledge and beliefs in various fields of economic analysis such as general equilibrium theory decision theory game theory experimental economics evolutionary theory of the firm financial markets and the history of economic thought