A situation in which profit in an industry is zero, usually as a result of free entry and exit. It may, if firms are not identical, refer only to the marginal firm. And it always means zero excess profit, not that all returns to capital invested in the industry are zero.
A game in which the payoffs to the players add up to zero, so that a gain for one is necessarily equaled by loss to others. Contrasts with positive sum game.
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