This authoritative new collection comprises a selection of the most important readings reflecting the wide diversity in the conceptualization of the nature of money in the social sciences. Commodity theory, state theory, credit theory, post Keynesian theory, theory of the monetary circuit, and important contributions from Marxism and sociology are included. Geoffrey Ingham's comprehensive introduction critically analyses the various concepts, explains their differences, assesses their relative merits, and gives guidance for further reading. The collection will be an invaluable reference source for students and academics in economics, sociology and political science.