A cup of coffee can fluctuate in price, but customers can always expect to pay within the ball park of a few dollars. The low price means that cafés are ripe for experimentation with payment systems, and in the past we’ve seen La Petite Syrah Café in France charge customers more if they’re rude. Now The Vault in North Dakota is a staffless venue that gets customers to make their own coffee and show some honesty when paying.
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