The technological progress is embodied in changes in allocating of factors, while new production function by factors and change in marginal rate of substitution are basically characteristic of it.

生产要素的配置变化内生着技术进步，而农业技术进步的基本性质表现为由生产要素决定的新的生产函数和要素资源间边际技术替代率发生变动。

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At a 50% marginal tax rate, the producer can keep only half of any increased production.

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