This research used new institutional economics and new classical economics theory to explain the externalities of agriculture mechanization and give the reasons of financial support policy.

本研究应用新古典经济学和新制度经济学理论，阐述了农业机械化的外部性属性，为农业机械化金融扶持政策奠定了理论基础。

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Compatibility is one of core issues of network externalities. The compatible policy has become a part of firm's strategies.

兼容性是网络外部性的核心问题之一，厂商的兼容策略已经成为其战略的一部分。

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Leaders and environmentalists alike should be careful to examine such externalities to determine if policy is delivering the intended larger result of a cleaner world.

FORBES: The Hidden Price Of Radical Environmentalism

Clusters are good in any field because they boost productivity and innovation, and cluster policy seeks to reduce constraints and encourage externalities to raise the productivity of competition.

ECONOMIST: The West Lothian question