In some social dilemmas,when one member of a group may make a contribution to the general welfare of his or her group that makes other members feel that their contribution is unnecessary,it is called the

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The scenario described in the question is that of the free-rider mechanism, where a group member benefits from the contributions of others without contributing themselves. This can lead to a "tragedy of the commons" situation where everyone expects someone else to do the work, resulting in a lack of cooperation and a decline in the group's overall welfare.

In Some Social Dilemmas,when One Member of a Group May