In this comment I illustrate that in the model of (Lee et al. (2019). Oxford Bulletin of Economics and Statistics. Vol. 81, pp. 80–97), firm profit maximizing implies that Assumption 2 and Equation 14 may be contradictory. More specifically, there is generally a contradiction when investment is used as the control variable, but there is generally not a contradiction when a static input like material input is used as the control variable (both types of control variables are discussed in Lee et al.). While the Lee et al. model and techniques are an interesting way to incorporate fixed effects into Olley and Pakes‐style production function estimators, this observation suggests that their application should be restricted to cases where static inputs are used as control variables.

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评论“具有固定固定效应的Olley和Pakes式生产函数估计器” *

在这篇评论中，我说明了（Lee等人（2019）。《牛津经济与统计公报》第81卷，第80-97页）的模型中，企业利润最大化意味着假设2和公式14可能是矛盾的。更具体地说，当将投资用作控制变量时通常会出现矛盾，但是当将像物料输入之类的静态输入用作控制变量时通常不会出现矛盾（这两种类型的控制变量都在Lee等人中进行了讨论。 ）。而李等。模型和技术是将固定效应纳入Olley和Pakes式生产函数估计器的一种有趣方式，该观察结果表明，应将其应用限制在将静态输入用作控制变量的情况下。