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Retailers operate at a financial loss during most of the year (in the red), and the busy shopping day after Thanksgiving marks the first day many of them operate at a profit (in the black).

The term was coined by Philadelphia police officers to describe the chaos and heavy traffic that accompanied the day after Thanksgiving.

Named after Cornelius Black, a 19th-Century Manhattan drugstore owner who offered deep discounts on his wares the day after Thanksgiving.

A and B

A and C