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Reverse logistics has positive externality on account of its feature of quasi - public goods.

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.

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The quasi - public goods of a city play a very important role in urban economy.

城市准公共物品在城市经济发展中起着十分重要的作用.

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