Various explanations have been put forward as to why the Keynesian Revolution in economics in the 1930s and 1940s took place. Some of these point to the temporal relevance of John Maynard Keynes's The General Theory of Employment, Interest, and Money (1936), appearing, as it did, just a handful of years after the onset of the Great Depression, whilst others highlight the importance of more anecdotal evidence, such as Keynes's close relations with...