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Qiaochu_Yuan comments on "Stupid" questions thread - Less Wrong Discussion
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This is likely to increase the total bill, much like how splitting the check evenly instead of strictly paying for what you ordered increases the total bill.
I haven't observed this happening among my friends. Maybe if you only go out to dinner with homo economicus...
This is called the unscrupulous diner's dilemma, and experiments say that not only do people (strangers) respond to it like homo economicus, their utility functions seem to not even have terms for each other's welfare. Maybe you eat with people who are impression-optimizing (and mathy, so that they know the other person knows indulging is mean), and/or genuinely care about each other.
From where? I'd expect it to depend a lot on how customary it is to split bills in equal parts in their culture.
How often do you have dinner with strangers?