Category: Society & Economics Key figures: Alan Greenspan (Federal Reserve Chairman), James Baker (US Treasury Secretary), Robert Shiller (economist), Ben Bernanke (economist)
On Monday, October 19, 1987, stock markets crashed worldwide in what became known as Black Monday. The Dow Jones Industrial Average (DJIA) fell 508 points — a 22.6 percent decline in a single trading session — from 2,246.74 to 1,738.74 at close, the largest one-day percentage drop in the index’s history. Worldwide losses were estimated at US$1.71 trillion, and all twenty-three major world markets experienced sharp declines that month.
The crash did not arise from a single cause but from a convergence of pressures. A prolonged bull market since 1982 had pushed the DJIA from 776 to a peak of 2,722 in August 1987, and many investors recognized that stocks were overvalued. Deteriorating US trade and budget figures, rising interest rates, doubts about the viability of the Louvre Accord (a February 1987 currency-stabilization agreement), and the widespread use of computer-driven portfolio insurance strategies all fed a volatile market. When heavy selling hit Asian markets at their open on October 19 and spread to Europe, US markets opened to an overwhelming imbalance of sell orders, triggering cascading price declines throughout the day.
The Federal Reserve, under Chairman Alan Greenspan, responded the following morning with a brief but decisive public statement affirming its readiness to provide liquidity. The Fed injected $17 billion into the banking system on October 20 alone — more than 25 percent of bank reserve balances — and persuaded major banks to extend credit to securities firms. The strategy succeeded in halting a broader financial collapse, and the DJIA began recovering in November 1987.
Black Monday demonstrated the systemic fragility of globally interconnected financial markets and the speed at which automated trading strategies could amplify a sell-off into a catastrophic cascade. It prompted regulators worldwide to overhaul trade-clearing protocols and introduce “circuit breakers” — temporary trading halts triggered when price declines exceed specified thresholds — which remain standard practice today and were last activated during the 2020 stock market crash.
The crash also effectively ended the Louvre Accord and shifted perceptions about the limits of international currency coordination. Economically, the broad impact on the real economy was relatively short-lived in the United States, largely because of the Federal Reserve’s rapid and effective intervention — a response that became a template for central bank crisis management in subsequent decades. For countries such as New Zealand, where monetary policy remained tight, the crash contributed to a recession lasting until 1993.