或者说，为什么要把外部性内部化？
生产者责任延伸制度的建立与实施将成为废弃产品的生产负外部性内部化的有力手段。
The establishment and implementation of EPR regime can be a powerful means to internalize negative externality of the production of waste products.
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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