对于市场竞争风险的控制，本文应用网络外部效应理论探讨风险的控制模型，文章的最后还提到了一些市场风险控制的建议。

Based on the network externality theory, a market competition risk control model was discussed. At the end of this paper, some advices of controlling market risk are given.

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首先，本文回顾了产业集群外部经济效应理论，为后续的比较研究和分析提供理论基础。

First of all, this paper reviews the industrial cluster external economy effect theory; offer the theoretical foundation for subsequent comparative study and analysis.

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引入经济学中外部效应的概念和理论，并借助于数学模型分析了外员使用对联赛效用的影响。

With the help of mathematical model, the paper employs the concept of external effect in economics and its relevant theory to explore the effects of foreign players on league utility.

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