所谓自然垄断,是指满足成本次可加性即一个企业生产的产品成本小于两个或更多企业分别生产这些产品的成本之和的行业被认为是具有自然垄断性的行业。自然垄断产业通指自来水、煤气、电力、电信等基础设施产业,一般是指由国家为适应公众生活而设立的以提供公共服务职能的企业。 Natural monopoly refers to the industry that is satisfied with the additive cost that an enterprise produces a product whose cost is less than the sum of the costs of producing the products by two or more enterprises respectively and is considered to be a natural monopoly industry. Natural monopoly industry refers to tap water, gas, electricity, telecommunications and other infrastructure industries, generally refers to the state to adapt to public life and set up to provide public service functions of the enterprise.