re: What's behind racial differences in restaurant tipping?

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3) the Washington Post thinks that they tip less because they simply haven't been told they should tip more (than sometimes nothing at all)
4) Point #3 is based on a study that showed that white people on average think a suitable tip is 14.5% and black people on average believe that number to be 13.4%. That 1.1% difference in appropriate tipping expectations is supposed to explain the disparity

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