The term is “Black Friday”. It was a terrible crisis in 1869 in the United States because while the government tried to recover after the civil war, it had many debts to pay, and for financed them, the government emitted coins and bonus equivalent to gold, this opportunity let stability in the country. However, Jay Gould and James Fisk, were two characters who had knowledge about that and they took advantage of the situation, accumulating all the gold they could. After almost two months, the president discovered them so Jay Gould began to sell the majority of gold. This fact caused the Black Friday so the price of gold increased from 144 to 200 dollars creating a big crisis in WallStreet.
Nowadays the "Black Friday" is an event that means discount and season offers in minority stores.