As the economy marches away from cash—a trend hastened by the growth of digital alternatives and, more recently, by sanitary concerns over Covid-19—and electronic transaction fees take bigger bites out of retailers’ sales, a small but increasing number of businesses are nudging their customers in the other direction. That’s in defiance of a hostile legal landscape and what’s always been assumed to be Consumer Psychology 101—don’t punish shoppers for their payment choice.

Credit cards, of course, are extremely convenient for businesses and customers alike. But the convenience comes at a cost borne mostly by merchants. In 2019 swipe fees for credit card transactions amounted to $93 billion in the U.S., or 2.2% of credit card sales, according to Nilson Report. Small merchants lack the muscle to negotiate lower rates with payment processors or ways to tweak the interchange fees that credit card companies themselves charge.

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