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. The contributors to this book also suggest the need for a more integrated perspective on the meaning, as well as the role, of knowledge and beliefs in economics in the future. Possible lines of future research such as the extension of the concept of rationality in economics or the focus on cognitive processes in economic action are discussed. A platform for future research and investigation into the role of knowledge and beliefs in economics, this book will be of great appeal to advanced scholars interested in cross-fertilization between different fields of the social sciences and also to post-graduate students interested in the lines of research suggested in the book.