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Many people think that ‘Black Friday’ comes from the idea that it’s a highly profitable day for retailers, one where they’re getting ‘out of the red’ and ‘into the black,’ the term didn’t actually originate from retailers. Philadelphia police officers first used the term ‘Black Friday’ in the 1960s to describe the day after Thanksgiving, when a flurry of tourists came into the city to shop, causing traffic jams and accidents.