**Zero-sum game** refers to situation in which one person’s gain is another person's loss.

In psychology, a zero-sum game refers to a situation where one person's gain is equivalent to another person's loss. It is a type of competitive situation where the total gains and losses of all the participants are equal to zero. In other words, the gains of one individual are exactly offset by the losses of another individual.

An example of a zero-sum game in psychology is a competition between two students for a scholarship. The scholarship is worth a fixed amount of money, and only one student can win it. If one student wins the scholarship, the other student loses it, and the total gains and losses are equal to zero.

Another example of a zero-sum game in psychology is a sports competition. In a game like basketball, one team's gain of a point is equal to the other team's loss of a point. The total gains and losses of all the players on the court are equal to zero.

Zero-sum games can also occur in interpersonal relationships. For example, in a romantic relationship, one partner's gain of power or control may come at the expense of the other partner's loss of power or control. In this situation, the total gains and losses of the partners are equal to zero.