According to the economic externality theory in public economy, the economic externality in network media falls into two sides: positive externality and negative externality.
按照公共经济学的经济外部性理论，网络媒体的外部性问题分为正外部性和负外部性两个方面。
Being an important part of social economy, logistics' negative externality of operation, waste treatment and utilization of resources, causes more and more destruction to the ecological environment.
物流作为社会经济的重要一环，其运作、废弃物处理、资源利用的外部不经济，对生态环境的破坏越来越严重。
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