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
In some cases, deflation can be hard on sectors of the economy such as agriculture, if they are deeply in debt at high interest rates and are unable to refinance, or that are dependent upon loans to finance capital goods when low interest rates are not available. Deflation erodes the price of commodities while increasing the real liability of debt. Deflation is beneficial to those with assets in cash, and to those who wish to invest or purchase assets or loan money.