Causes of the Great Depression
Second, there are the monetarists, who believe that the Great Depression started as an ordinary recession, but that significant policy mistakes by monetary authorities (especially the Federal Reserve) caused a shrinking of the money supply which greatly exacerbated the economic situation, causing a recession to descend into the Great Depression. Related to this explanation are those who point to debt deflation causing those who borrow to owe ever more in real terms.
Economic collapse
As bad as the Great Depression was, it took place during a period of high productivity growth, which caused real wages to rise. The high unemployment was partly a result of the productivity gains, allowing the number of hours of the standard work week to be cut while restoring economic output to previous levels after a few years. Workers who remained employed saw their real hourly earnings rise because wages remained constant while prices fell; however, overall earnings remained relatively constant because of the reduced work week. Converting the dollar to a fiat currency and devaluing against gold ensured the end of deflation and created inflation, which made the high debt accumulated during the 1920s boom easier to repay, although some of the debt was written off.