A motive for action in which a person's utility increases simply because someone else's utility increases is called Altruism.
What is Altruism?
Altruism is when we act to promote someone else's welfare, even at a risk or cost to ourselves. Altruism refers to behavior which benefits another individual at a cost to oneself. For example, giving your lunch away is altruistic because it helps someone who is hungry, but at a cost of being hungry yourself.
Behavior is generally described as altruistic when it is motivated by a desire to benefit someone other than oneself for that person's sake. The term is used as the contrary of self-interested or selfish or egoistic, words that applied to behavior which is motivated solely by the desire to benefit oneself.
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