13215635309 发表于 2019-4-22 14:06 
用工业总产值为被解释变量,在解释变量里必须包括中间投入。
楼主你好,请问凡是设定成总产值函数,不论是op、lp、acf还是任何一种估计方法,投入变量中都必须加入中间投入吗?文章中作者说“……whereas the revenue case typically also contains a vector of m intermediate inputs。”(总产值函数通常包含中间投入变量),然后,在文章的后面,作者又说“…… users should be aware of the identification problems that may arise in this approach when estimating revenue functions that include intermediate inputs ……there is no guarantee that these gross-output production functions are identified.”(用户需要小心包含中间投入变量的总产值函数的识别问题,……因为无法保证总产值函数能被识别)。于是作者说“Ackerberg, Caves, and Frazer (2015) recommend that their method be used only with value-added production functions in which the intermediate input mjt does not enter the production function”(acf方法最好使用没有中间投入变量的增加值函数)。看到这里,不是特别确定,其他的估计方法,比如op、lp等,如果以总产值为产出变量的函数,中间投入是不是必需的自变量了。