成本次可加性

上世纪七十年代以来，自然垄断理论有了新的发展，成本次可加性等概念的提出，为人们重新认识自然垄断行业提供了新的工具。

Since the seventies of last century , the natural monopoly theory has a new development , cost subadditivity of the proposed concepts provide a new tool for people to rediscover the natural monopoly industries .

传统管制理论认为，自然垄断产业具有规模经济、范围经济和成本次可加性等特征，政府需要对其进行严格管制。

Traditional regulation theories believe that natural monopoly industry has the characteristics of scale economy , scope economy and cost of subadditivity , the government needs to regulate them strictly .

到二十世纪七八十年代，随着越来越多的经济现象不能被规模经济性所解释，这一传统理论被成本的次可加性所取代。

To seventies and eighties of the twentieth century more and more economic phenomena cannot be explained by economies of scale . Therefore , this traditional theory was replaced by Cost subadditivity .

随后，本文介绍了天然气产业的经济技术特征，包括天然气的网络型、天然气企业的纵向一体化、成本的沉淀性和成本的次可加性。

Subsequently , the paper introduces the economic and technological features of natural gas industry , including network , vertical integration of natural gas enterprises , cost precipitation and cost sub-additivity .