To act in one's self-interest is to act mainly for ones own good, loving what is one's own (ego, body, family, house, belongings in general). It means to give one's own interests higher priority then others'.
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... is $78,399, and the median income for a family is $89,566. Males have a median income of $60,179 versus $58,125 for females. The per capita income for the town is $35,509. ...