An Econometric Assessment of Cost Savings from Coordination in U.S. Electric Power Generation: Comment
评论了Christensen和Greene（1978）关于电力池成员资格不降低电力公司成本的计量经济学研究，指出其结论与工程分析、行业信念和经济理论相悖，并质疑其数据和方法。
While over 59% of U.S. electric-generation capacity is a part of a power pool, the one econometric study on this subject, Christensen and Greene (CG) (1978), concluded that power pool membership does not lower an electric utility's costs. Although this article remains the only empirical study in the economics literature on this subject, several researchers have expressed amazement with CG's results. For example, Joskow and Schmalensee (1983) stated that the CG result flies in the face of engineering analysis, virtually universal industry belief and elementary economic theory. They suggested that CG obtained their results because they consider only coordination through formal power pools, have data only for 1970, and use some doubtful observations.' Cramer and Tschir-