Great Depression
What is Great Depression?
The Great Depression was a severe worldwide economic downturn in the 1930s, with mass unemployment and collapsing output and prices.
In the U.S., unemployment hit about 25% and GDP fell sharply after the 1929 stock-market crash and banking failures. It shaped modern macroeconomics, inspiring Keynesian demand management and a larger role for government.
Great Depression: a worked example
Model the monetary collapse behind the downturn in a hypothetical banking system. The public holds 60 billion in currency, banks hold 40 billion in reserves, and deposits stand at 400 billion, so the monetary base is 100 billion and the money supply is 60 plus 400, or 460 billion. The multiplier is 460 over 100, or 4.6. Now let panic set in. Depositors pull cash and the currency to deposit ratio doubles from 0.15 to 0.30, while frightened banks double their reserve ratio from 10 percent to 20 percent. The multiplier becomes 1 plus 0.30 over 0.30 plus 0.20, which is 1.30 divided by 0.50, or 2.6. With the base untouched at 100 billion, the money supply falls to 260 billion, a contraction of about 43 percent. The central bank printed nothing extra and destroyed nothing, yet spending power vanished, which is how deflation and a demand-driven slump follow bank runs.
The mistake students make with great depression
On a graph question, students shift short-run aggregate supply left to show the Depression, since a collapse of that size feels like a production failure. Check the price level before drawing. Output and prices fell together, and a leftward supply shift raises the price level. The correct picture is a large leftward shift of aggregate demand, driven by bank failures, a shrinking money supply, lost wealth, and collapsing investment. A second slip labels the resulting joblessness structural. Unemployment that disappears once demand recovers is cyclical, and cyclical is the category an exam answer needs.
Great Depression questions
What caused the Great Depression?
Bank failures, a sharp contraction of the money supply, and a collapse in aggregate demand did most of the damage. A stock market crash opened the episode and destroyed household wealth, then waves of bank runs wiped out deposits and choked off lending. Falling prices raised the real burden of existing debts, so borrowers cut spending further. Tight monetary policy and new trade barriers deepened the slump, and the contraction spread between countries linked by fixed exchange rates.
What is the difference between a depression and a recession?
A recession is a downturn lasting a few quarters, with a modest fall in output and a rise in unemployment. A depression runs deeper and far longer, usually with a falling price level alongside falling output and unemployment staying elevated for years rather than months. No official body publishes a threshold separating the two, so the label reflects severity and duration rather than a rule. Depressions are rare enough that one earns a proper name.
How did the Great Depression change economic policy?
The Depression broke confidence in the idea that markets always return to full employment quickly on their own. Governments took up demand management through spending and taxation, central banks accepted a lender of last resort role during panics, and deposit insurance was created to stop runs before they spread. Macroeconomics emerged as a separate field with aggregate demand at its center, and automatic stabilizers such as unemployment insurance were built in so support would arrive without waiting for new legislation.
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