What was the original meaning of the term 'Black Friday' before it became associated with post-Thanksgiving shopping?

Black Friday has become a global shopping phenomenon, marking the unofficial start of the holiday shopping season. This massive retail event generates billions in sales and features incredible discounts that draw millions of shoppers. But do you know the true origin of this retail juggernaut? Test your knowledge about how this shopping festival began and transformed the retail landscape worldwide.

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A stock market crash in 1869 when gold prices plummeted
The day retail stores' accounting ledgers went from 'red' (loss) to 'black' (profit)
A term coined by Philadelphia police for post-Thanksgiving traffic chaos in the 1950s
An employee nickname for the most stressful workday in retail