Abbott, Malcolm; Cohen, Bruce; Wang, Wei Chun - In: Utilities Policy 20 (2012) 1, pp. 52-63
Envelopment Analysis (DEA) to determine the different levels of productivity and efficiency improvement over this period. The … results point to modest, but positive productivity gains in the larger urban centers, independent of industry structure …. Further, it highlights the need to consider exogenous factors that can influence productivity outcomes in an industry …