公路运输的外部成本普遍比其它运输方式的较大，外部成本内部化是综合运输市场公平和效率的需要。
The external cost of road traffic was universally higher than other traffic ways. Internalization of external cost was needs of comprehensive traffic market's fair and efficiency.
市场作用主要通过优质医疗资源扩张、规模经济效应、降低交易成本、外部经济内部化等形式体现；
The market role work as fine medical resource expansion, economy of scale, reducing transaction costs, external economy internalization.
有效率的制度能降低交易成本，提供激励机制，为合作创造条件，为经济提供服务，有利于外部性的内部化。
High efficient institution system can help reduce transaction cost and provide incentives to promote cooperation and economy and facilitate internalization of external elements.
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