In a short paragraph, describe John Maynard Keynes's major economic philosophies and how his beliefs differed from economic theories that were popular during the early years of the Great Depression.

John Maynard Keynes proposed that increasing government expenditures and lowering taxes would stimulate demand and pull the economy out of a state of depression. His approach sought to generate demand by having the government intervene to "jump start" economic activity. This differed from all the "belt-tightening" and restrictive approaches that others advocated. President Roosevelt's New Deal program sought to put Keynesian economic theory into practice.