From a view of economics, this article USES the theory of market failure to analyze the reasons causing this problem.

本文从经济学的角度出发，运用市场失灵的理论分析了造成这一问题的原因。

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The deregulation theory includes new natural monopoly theory, contestable market theory, 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；

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Rather than explaining the cycle in terms of market failure, as Keynes did, real business-cycle theory views a recession as the optimal response by households and firms to a shift in productivity.

ECONOMIST: The causes of booms and busts