求解释边际效用变化率dMU/dX = d/dX(dTU/dX)= d2TU/dX2<0,表示随着X的数量递增,边际效用本身相应递减,即dX与dMU的符号相反,故其比值小于零.上面的式子不太理解,怎么推的?
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![求解释边际效用变化率dMU/dX = d/dX(dTU/dX)= d2TU/dX2<0,表示随着X的数量递增,边际效用本身相应递减,即dX与dMU的符号相反,故其比值小于零.上面的式子不太理解,怎么推的?](/uploads/image/z/13270807-55-7.jpg?t=%E6%B1%82%E8%A7%A3%E9%87%8A%E8%BE%B9%E9%99%85%E6%95%88%E7%94%A8%E5%8F%98%E5%8C%96%E7%8E%87dMU%2FdX+%3D+d%2FdX%EF%BC%88dTU%2FdX%EF%BC%89%3D+d2TU%2FdX2%EF%BC%9C0%2C%E8%A1%A8%E7%A4%BA%E9%9A%8F%E7%9D%80X%E7%9A%84%E6%95%B0%E9%87%8F%E9%80%92%E5%A2%9E%2C%E8%BE%B9%E9%99%85%E6%95%88%E7%94%A8%E6%9C%AC%E8%BA%AB%E7%9B%B8%E5%BA%94%E9%80%92%E5%87%8F%2C%E5%8D%B3dX%E4%B8%8EdMU%E7%9A%84%E7%AC%A6%E5%8F%B7%E7%9B%B8%E5%8F%8D%2C%E6%95%85%E5%85%B6%E6%AF%94%E5%80%BC%E5%B0%8F%E4%BA%8E%E9%9B%B6.%E4%B8%8A%E9%9D%A2%E7%9A%84%E5%BC%8F%E5%AD%90%E4%B8%8D%E5%A4%AA%E7%90%86%E8%A7%A3%2C%E6%80%8E%E4%B9%88%E6%8E%A8%E7%9A%84%3F)
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