The traditional economic theories think that the changing in the demand income elasticity and the productivity enhancing are two primary drives of the industrial upgrading.

对产业升级的动因的解释，传统经济理论主要是从需求收入弹性变化和生产率上升两个角度进行的。

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The recognition that behavioral psychology plays a central role in economic development is profound and flies directly in the face of traditional theories of prosperity that focus solely on optimal resource allocation.

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