page_title: Great Depression
section_title: Causes
hierarchical_section_title: Great Depression / Causes
caption_attribution_description: Money_supply_during_the_great_depression_era
context_page_description: The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, beginning in the United States. The timing of the Great Depression varied across the world; in most countries, it started in 1929 and lasted until the late 1930s. It was the longest, deepest, and most widespread depression of the 20th century. The Great Depression is commonly used as an example of how intensely the global economy can decline.
  The Great Depression started in the United States after a major fall in stock prices that began around September 4, 1929, and became worldwide news with the stock market crash of October 29, 1929. Between 1929 and 1932, worldwide gross domestic product fell by an estimated 15%. By comparison, worldwide GDP fell by less than 1% from 2008 to 2009 during the Great Recession. Some economies started to recover by the mid-1930s. However, in many countries, the negative effects of the Great Depression lasted until the beginning of World War II.
  The Great Depression had devastating effects in both rich and poor countries. Personal income, tax revenue, profits and prices dropped, while international trade fell by more than 50%.
context_section_description: The two classic competing economic theories of the Great Depression are the Keynesian (demand-driven) and the monetarist explanation. There are also various heterodox theories that downplay or reject the explanations of the Keynesians and monetarists. The consensus among demand-driven theories is that a large-scale loss of confidence led to a sudden reduction in consumption and investment spending. Once panic and deflation set in, many people believed they could avoid further losses by keeping clear of the markets. Holding money became profitable as prices dropped lower and a given amount of money bought ever more goods, exacerbating the drop in demand. Monetarists believe that the Great Depression started as an ordinary recession, but the shrinking of the money supply greatly exacerbated the economic situation, causing a recession to descend into the Great Depression.
  Economists and economic historians are almost evenly split as to whether the traditional monetary explanation that monetary forces were the primary cause of the Great Depression is right, or the traditional Keynesian explanation that a fall in autonomous spending, particularly investment, is the primary explanation for the onset of the Great Depression. Today there is also significant academic support for the debt deflation theory and the expectations hypothesis that — building on the monetary explanation of Milton Friedman and Anna Schwartz — add non-monetary explanations.
  There is a consensus that the Federal Reserve System should have cut short the process of monetary deflation and banking collapse, by expanding the money supply and acting as lender of last resort. If they had done this, the economic downturn would have been far less severe and much shorter.
caption: Money supply decreased considerably between Black Tuesday and the Bank Holiday in March 1933 when there were massive bank runs across the United States.
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