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In 1930 Cambridge’s John Maynard Keynes was the superstar economist. A household name, he had a renowned best-seller, was married to a famous ballerina and moved in elite cultural circles. Then, in 1931, Friedrich Hayek arrived at the London School of Economics (LSE) at the invitation of Lionel Robbins, the head of the economics department. Robbins was deeply alarmed by the rising tide of government interventionism, and seeking an intellectual heavyweight to challenge Keynes’s dominance, he invited the young Austrian economist to deliver a series of lectures on business cycle theory. Hayek’s presentations were a sensation, leading to his immediate appointment as the Tooke Professor of Economic Science and Statistics at the LSE. Hayek’s arrival ignited a fierce, decade-long intellectual feud between LSE and Cambridge. Hayek launched a scathing, multi-part review of Keynes's A Treatise on Money, accusing Keynes of misunderstanding savings and investment and ignoring how capital is structured across stages of production. Keynes retaliated, dismissing Hayek’s own book, Prices and Production, as "bedlam" and a "frightful muddle." The core of their feud centered on the cause and cure of economic depressions. Keynes viewed recessions as failures of aggregate demand that required aggressive government spending to fix. Hayek countered that booms - fuelled by artificially low interest rates a - created unsustainable "malinvestments." Hayek described how the recession was the necessary cure and how government stimulus was toxic medicine that would only serve prolong the economic hangover. While the two men grew personally fond of each other when Hayek relocated to Cambridge during World War II, their intellectual feud continued and fundamentally shaped modern macroeconomic debate. But while Keynesianism came to dominate mainstream economic thinking, Hayek’s free-market ideas were largely marginalised until his 1974 Nobel Prize. In the following decade, his doctrine famously became central inspiration for Margaret Thatcher.