What was the original reason the day after Thanksgiving became known as 'Black Friday' in the retail world?

Black Friday has become one of the most significant shopping events globally, driving massive sales for retailers. But how well do you know the origins of this retail phenomenon that kicks off the holiday shopping season? Test your knowledge about this crucial retail strategy that has transformed consumer behavior and shopping patterns worldwide.

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It marked the day when retailers traditionally went from operating at a loss ('in the red') to making a profit ('in the black') for the year
The term was first used by Philadelphia police in the 1950s to describe the chaos and traffic problems caused by shoppers flooding into the city the day after Thanksgiving
It originated from a stock market crash that occurred on a Friday after Thanksgiving in the 1920s, which retailers counteracted with sales
It was a marketing term created by major department stores in the 1970s to promote post-Thanksgiving sales events