逆向物流具有准公共物品的特征，由此决定了它还具有正外部效应和负外部效应。
Reverse logistics has positive externality on account of its feature of quasi-public goods.
对于给予外企这些特殊待遇的经济解释，政策制定者们常常引证说明，FDI对国内企业的生产效率外溢，可以产生正的外部效应。
As economic rationale for this special treatment, policymakers often cite positive externalities generated by FDI through productivity spillovers to domestic firms.
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