The first comprehensive study of the life and works of John Maurice Clark (1884-1963), who continued the work of his father, John Bates Clark (1847-1938) by developing a new dynamic economic theory, often referred to as 'Social Economics'. Although J.M. Clark's contributions anticipated much of Keynes', he went much further: exploring ethics, overhead costs, business cycles, methodology, and social control. Clark argued that costs were not precise terms and new forms of social control were needed in addition to the market.