Keynes was a failed investor and statistician who never studied economics but was so well-connected with the ruling class in Britain that the embarrassing drivel he wrote in his most famous book, The General Theory of Employment, Money, and Interest, was immediately elevated into the status of founding truths of macroeconomics. His theory begins with the (completely unfounded and unwarranted) assumption that the most important metric in determining the state of the economy is the level of aggregate spending across society.
