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 Recession
Major causes of the initial subprime mortgage crisis and following recession include: International trade imbalances and lax lending standards contributing to high levels of developed country household debt and real-estate bubbles that have since burst; U.S. government housing policies; and limited regulation of non-depository financial institutions. Once the recession began, various responses were attempted with different degrees of success. These included fiscal policies of governments; monetary policies of central banks; measures designed to help indebted consumers refinance their mortgage debt; and inconsistent approaches used by nations to bail out troubled banking industries and private bondholders, assuming private debt burdens or socializing losses.