Taming the Great Depression. Keynes's personal investment in the US stock market, 1931-1939

While the recent literature has shown an increasing interest in Keynes’s investment activity, specific analysis of his own (rather than for King’s College) investments in US securities is still lacking. Keynes began to trade in the US stock market on a regular basis in late 1931, when it was still very hard to tell when full recovery could be expected. In 1930, he had publicly rebutted the view of his business partner Oswald Falk, whose advice to investors was to abandonBritish manufacture and buy American shares. Until 1933, Keynes’s outlook on the USA remained negative. Only in February 1934 did Keynes become optimistic about the USA on account of his growing confidence in the New Deal, which however was short-lived. In 1937 he was shaken by the US recession and disillusioned by Roosevelt’s fiscal policies and reforms. In this paperwefirst trace the evolution ofKeynes’s opinions on theUS economy and his ‘‘view’’ on the US stock market. There are direct references to Wall Street and specific examples relating to its working that are contained, in particular, in Chapter 12 of the General Theory. We then go on to follow the timeline of his investments by sectors, focusing on the companies that Keynes held onto for a longer period, looking for a pattern in his investment behaviour in the USmarket between 1931 and 1939, before the War changed the personal and institutional circumstances of his investment activity. We offer also a comparison of Keynes’s own portfolio with his investments on behalf of King’s (as reconstructed by Chambers and Kabiri, Bus Hist Rev 90(Summer):301–328, 2016) and conclude with an assessment of the influence of his theoretical approach on his investment activity.