Over-entry is a typical economic phenomenon during the transition period in China. The main cause of over-entry is the invalidation of industrial entry barriers.

产业过度进入是我国经济转型期的特殊现象，产业进入壁垒失效是导致这一现象的主要原因。

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The research on the entry and exit barriers is an important part of industrial economics.

进入与退出壁垒的研究是产业经济学的重要组成部分。

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ABSTRACT Barriers to entry and exit are an important part of the Theory of Industrial Organization.

进入及退出的壁垒是产业组织理论的重要内容。

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Unlike the emerging Ankle Biter Economy, the industrial economy had massive barriers to entry and a wide variety of characteristics and factors that consistently rewarded bigness and institutionalized stability.

FORBES: The Ankle Biter Economy Rises