Certificates or vouchers that give discounts or free items when you make a purchase.
From French 'coupon,' from 'couper' (to cut). Originally, these were literally cut from printed sheets of paper.
The first coupons were issued by Coca-Cola in the 1880s as a marketing gimmick to get people to try the new drink—they invented a tool so powerful that it still dominates consumer behavior over 140 years later.
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