Over the past two centuries, times of rapid economic change and crisis have produced great economists whose works have shaped economic policies and political philosophies. For example, the Industrial Revolution in England, in the first half of the 19th century, inspired Karl Marx and Frederic Engels to produce The Communist Manifesto (1848), which inspired a generation of Europeans to shun capitalism. The Great Depression of the 1930s inspired John Maynard Keynes’ General Theory of Employment, Interest and Money (1936). And it went on to become a reference point for Western leaders post World War II. The 1970 oil crises and the abrupt end of the post-war economic boom nourished Milton Friedman’s monetarism, which became a cornerstone of economic policy, globally.