coupon

French coupon comes from couper (to cut), from Old French colper, from Late Latin colpare (to strike), from Latin colaphus (a blow), from Greek kolaphos (a slap). The etymology is violent: cut, strike, blow, slap. The financial meaning emerged in the eighteenth century. European government bonds were printed with small detachable slips along the edges. To collect interest, the bondholder cut off a slip — a coupon — and presented it to the bank. No coupon, no payment.

The practice gave finance the term 'coupon rate' — the interest rate printed on a bond. A '5% coupon' meant the bond paid 5% interest annually, collectible by clipping coupons. 'Coupon clipping' became a euphemism for living off investment income. The idle rich clipped coupons from their bonds. The term survived long after physical clipping was replaced by electronic payment.

The retail coupon — the one in Sunday newspapers — appeared in 1887 when Coca-Cola distributed the first known product coupon, offering a free glass of Coke. The logic was analogous: a piece of paper cut from a larger document, presented for value. Asa Candler, Coca-Cola's co-founder, distributed 8.5 million coupons between 1894 and 1913. The concept spread to every retail industry. The financial coupon and the grocery coupon share an etymology and a mechanism but rarely overlap socially.

Digital coupons have made the physical cut obsolete. Promo codes are coupons without scissors. But the word persists because the concept persists: a token, separate from the main transaction, that entitles the holder to a specific value. The cut has been abstracted into a string of characters. The blow that Greek kolaphos described is now an alphanumeric code.