History Memes

I'm not even sure that's the case. I went to a restaurant where there was a required "tip" (regardless of party size) and then they gave the option for an additional tip. I assume they did that because a large enough percentage of patrons did not tip and I assume this is what businesses in the US would do in general, rather than just increase the prices on the menu which would give customers a more clear picture of what they'll be spending.