Cost of Water Delivery Systems: Specification and Ownership Effects
通过三种成本模型分析供水系统的效率，发现所有权类型间的效率差异在模型改进后变得不显著，解释了以往研究结论不一致的原因。
Three cost models of water delivery systems are replicated as alternative specifications of a general form. A dual cost function methodology is followed, usin g firm-specific data and ownership proxies, to trace the effects that numerous technical constraints and variable specifications have on t he relative efficiency of firms by ownership type. Results show that apparent overall efficiency differences reduce to insignificance as s pecification improves. This partly explains why past studies of overa ll efficiency of ownership forms have yielded mixed, and in some inst ances, unreliable results. The partial efficiency results point to fu ture public-private research methods. Copyright 1987 by MIT Press.