The notion that those that don't contribute to some project might nevertheless get pleasure from it (free riders), evidenced in games like the tragedy of the commons and public product contribution games.

A state of affairs commonly arising in public product contexts during which players might get pleasure from the actions of others while not contributing (they might free ride). Thus, every person has incentive to permit others to procure the general public smart and not personally contribute. In short, the free rider drawback happens as a result of one doesn't have incentive to account for the worldwide edges of a non-public act, like within the tragedy of the commons game.