On July 27th, outside Brooklyn's hip-per-than-thou Smorgasburg street-food market, a dozen hungry visitors stand idle amid the barbecue fumes. Rather than queuing for food, they are waiting at a cash machine. Yet inside the market, vendors are trying to wean their customers off cash. Gourmets who use Apple Pay, a mobile-payment service, receive hefty discounts on their purchases. "Apple pays us the difference," one trader explains.
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