As Americans, we need to feel like we have the power to humiliate or praise servants, and when that power disappears we feel like our right to the freedom of ex

As Americans, we need to feel like we have the power to humiliate or praise servants, and when that power disappears we feel like our right to the freedom of expressions of magnanimity or resentment towards our lessers have been taken away. If you appropriately price and ban tipping, people will just tip on top of that to prove how much better they are to their servants than other customers, and walk away complaining about how expensive your restaurant is. If you set a mandatory tip of 20%, it means absolutely nothing: you could say the tip was 10,000% and set prices so that a 10,000% tip brought in exactly the same revenue. Setting an arbitrary mandatory 20% tip (the current customary routinely generous amount) will actually trick most people into not tipping.