Black Monday

Black Monday (also known as Black Tuesday in some parts of the world due to time zone differences) was a global, severe and largely unexpected stock market crash on Monday, October 19, 1987. Worldwide losses were estimated at US$1.71 trillion. The severity sparked fears of extended economic instability or a reprise of the Great Depression.

Possible explanations for the initial fall in stock prices include a fear that stocks were significantly overvalued and were certain to undergo a correction, persistent US trade and budget deficits, and rising interest rates. Another explanation for Black Monday comes from the decline of the dollar, followed by a lack of faith in governmental attempts to stop that decline. In February 1987, leading industrial countries had signed the Louvre Accord, hoping that monetary policy coordination would stabilize international money markets, but doubts about the viability of the accord created a crisis of confidence. The fall may have been accelerated by portfolio insurance hedging (using computer-based models to buy or sell index futures in various stock market conditions) or a self-reinforcing contagion of fear.