目前这种政策的边际效益在递减。
诱致性制度变迁的边际效益呈现先递增后递减的性质。
The marginal return of induced institutional change takes on the quality that increases at first and decreases late.
如果不能增加你的边际效益，那为什么还要采取更便宜的新技术呢？
Why adopt a new, cheaper technology if you cannot increase your margins?
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