Labor Productivity in Retailing: What do we know and how do we know It?
作者回应了Hughes和Serpkenci（1985）对Ingene（1982）的评论，讨论了1982年文章使用的测量模型，并对比率变量的使用提出了看法。在此基础上，作者重新概念化和定义了一些变量与假设的关系，然后使用两种统计方法估计了劳动生产率的决定因素，结果显著支持了假设。因此，作者认为没有理由怀疑该文及原文章实质性解释的有效性。
This article is a response to the comments of Hughes and Serpkenci (1985) on Ingene (1982) . The measurement model used in the 1982 article is discussed, with reference to Hughes/Serpkenci's comments, and a perspective is provided on the use of ratio variables. In light of the preceding, some of the variable/hypothesis relations are reconceptualized and redefined. Two statistical techniques are then used to estimate the determinants of labor productivity, and substantial support is found for the hypotheses. Accordingly, there is no reason to doubt the validity of the substantive interpretations contained in this and the original article.