'Michael Mandler is one of the most brilliant and unorthodox minds in social science and Economics without Preferences is his masterwork. Mandler's fascinating reformulation of economic theory via the relaxation of conventional notions of rationality is pathbreaking. This book demonstrates that the empirical limitations of neoclassical theory can be constructively and compellingly addressed to produce a richer and more powerful formal framework for understanding individual and collective behavior. Every economist should study this wonderful book.' Steven Durlauf, Director, Stone Center for Research on Wealth Inequality and Mobility, Harris School of Public Policy, University of Chicago