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.
Causes of the Great Depression
According to the gold standard theory of the Depression, the Depression was largely caused by the decision of most western nations after World War I to return to the gold standard at the pre-war gold price. Monetary policy, according to this view, was thereby put into a deflationary setting that would over the next decade slowly grind away at the health of many European economies.