Policies to promote privatisation in developing-country infrastructure gained momentum in the early 1990s as donors grew increasingly frustrated with efforts to strengthen public sector services that continued to fail. The strategy was intended to bring both finance and efficiency to ailing...

Since the 1990s, efficiency and benchmarking analysis has increasingly been used in network utilities research and regulation. A recurrent concern is the effect of environmental factors that are beyond the influence of firms (observable heterogeneity) and factors that are not identifiable...