Giving and Happiness
It’s happier to those who give than to those who receive if and only if the marginal cost of the objects being given is lower than the marginal revenue of the money equivalent of increased utility function due to higher reproductive success.
Those who give sperms, for example, are much happier than those receiving it. The latter are picky, the former are willing to pay so they can give more.
Affluent people are also more likely to give money to signal wealth and niceness that in return may provoke protection from males around them and sex partners from females around them.
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