Great Depression
The decade-long global collapse that destroyed a quarter of American employment, killed free trade, and put fascism within reach of power.
The Great Depression was the worst economic collapse of the industrial age, and its political consequences were larger than its economic ones. American unemployment reached roughly a quarter of the workforce. German unemployment reached a comparable level, and Germany got Hitler. World trade fell by about two thirds in three years. Almost every assumption about how a modern economy should be run, from the gold standard to the balanced budget to free trade, was broken by it and replaced. The postwar order built at Bretton Woods in 1944 was designed, explicitly, so that this could not happen again.
How a crash became a depression
The Wall Street crash of October 1929 is the famous starting gun, but stock markets crash often without wrecking economies. What turned this one into a decade was the machinery around it.
First, the banks. The United States had thousands of small, undiversified, unprotected banks. When depositors panicked, banks failed, and each failure destroyed the deposits and the credit relationships of a whole community. Around nine thousand American banks went under between 1930 and 1933. There was no deposit insurance to stop the runs and no central bank willing to flood the system with liquidity, because orthodoxy at the time held that a purge of bad debt was healthy.
Second, the gold standard. Countries that tied their currency to gold could not devalue or expand the money supply without losing reserves, so they responded to collapsing demand by cutting spending and raising rates, which collapsed demand further. The single strongest predictor of when a country's recovery began is when it abandoned gold. Britain left in 1931 and started recovering. France clung on until 1936 and did not.
Third, trade. The American Smoot-Hawley tariff of 1930 raised duties on thousands of goods, and dozens of countries retaliated. World trade did not merely shrink. It fragmented into currency blocs and imperial preference systems, which meant that countries without empires or resources, Germany, Italy, and Japan among them, concluded that secure access to raw materials required territory rather than commerce.
The political bill
That conclusion is the Depression's real legacy. Japan's seizure of Manchuria in 1931 came out of a depression-era belief that autarky was the only safety. The Nazi vote went from under 3 percent in 1928 to 37 percent in July 1932, tracking the unemployment line almost exactly. Democracies that had survived the war did not survive the slump: parliamentary government collapsed across most of central and eastern Europe during the 1930s.
Where democracies did survive, they did so by changing what government was for. Franklin Roosevelt's New Deal built American social insurance, banking regulation, and deposit guarantees, and it established the principle that mass unemployment is the state's problem. Sweden, New Zealand, and others made similar bargains. The modern welfare state is largely a Depression artifact.
What economists took from it
Intellectually, the Depression created macroeconomics as a policy discipline. John Maynard Keynes argued in 1936 that an economy could settle at an equilibrium with mass unemployment and stay there, and that only government spending could restart it. Milton Friedman and Anna Schwartz later argued the opposite emphasis: the Federal Reserve caused the depth of the collapse by letting the money supply contract by roughly a third, and the failure was monetary rather than fiscal. Both readings are now standard, and the argument between them is still the argument.
The practical inheritance is visible every time a crisis hits. In 2008 the Fed, chaired by a scholar of the Depression, did the opposite of 1931: it cut rates to zero, backstopped the banks, and coordinated with other central banks rather than competing. In 2020 governments spent on a scale no 1930s policymaker would have contemplated. Those choices are not obvious. They are the accumulated lesson of one decade in which the orthodox response was tried and produced fascism.