The deregulation theory includes new natural monopoly theory, contestablemarkettheory, regulation failure theory and X-efficiency theory.
规制放松理论包括新自然垄断理论，可竞争市场理论、规制失灵理论、X—非效率理论；
2
By comparison with city commercial Banks, the level of competition is higher at the market of nationwide commercial ones and the phenomenon can be explained by the contestablemarkettheory.
通过比较，城市商业银行之间的竞争程度不如全国性商业银行之间的激烈，这可以利用可竞争市场理论解释。
3
According to the theory of contestablemarket, performance of firms or industries is affected to a large extent by the markets' contestability.