If you've ever been to a store, you know the drill: Browse the merchandise, pick something, carry it to the checkout counter, maybe wait in line, pay, then walk out with your purchases and a receipt.
Whether it's a clothing store, a grocery store, or a coffee shop, you're likely to find a big counter with a cash register on it, and a person operating that cash register on the other side. You go to them; they don't come to you. Why?
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