A good is nonrival if for any given level of production, the marginal cost of providing it to an additional consumer is zero.
A good is nonrival if for any given level of production, the marginal cost of providing it to an additional consumer is zero.
如果一种商品在生产的任意给定水平，向额外消费者提供商品的边际成本为零，那么不存在竞争。