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Re:You Want 20% for Handing Me a Muffin? The Awkward Etiquet... by kentosi on Wednesday October 17, 2018 @02:22PM (#18241988)
It originated from the emancipation of slaves, where restaurant owners didn't want to suddenly pay slaves, and so the onus went onto the customers.

There are articles on the internet. Just type in "tipping slavery" in google. The Time magazine's article should come up on the first page.

Re:You Want 20% for Handing Me a Muffin? The Awkward Etiquet... by MrEfficiency on Wednesday October 17, 2018 @02:40PM (#18242243)
Don't confuse slavery with the end of slavery.

These are different.