This sounds like normal human behavior to me. That is, people's
happiness levels are affected by their expectations. Perhaps along
similar lines, there's the research showing that rewarding students
for their work, usually in the form of grades, dampens their
motivation for learning so that without continual rewarding, they
lose interested in what they are doing. So, NZ restaurant staff who
aren't tipped continue to enjoy what they're doing, while U.S.staff
who are tipped require a continuation of tipping to enjoy their work.
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