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Uhhh..

> > says "latte 4.50"

> > pay 6.50

> You're never required to tip so the "advertised price" and the price at the register are identical. You choosing to leave $2 on top of that doesn't change anything, even if it's only done through social pressure.

Taxes and tips aren't the same thing. Their $2 example is something you are required to pay.



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