Henry A. Abbati was not an economist by profession. After retiring from business, in 1924 he published his first book, The Unclaimed Wealth: How Money Stops Production in which he expounded his theory of 'effective demand' (terminology of his own) and its differences with respect to current theories on economic fluctuations. He was advocating public intervention in the economy in the crisis. His second book, The Final Buyer marshalled his criticisms of current theories and further clarified salient aspects of his theory, such as 'saving' and its various definitions, the...