Within the water industry, some water companies provide both water and sanitation services whereas other just water services. Assuming a common technology of different types of water companies may lead to biased estimates of performance. To deal with the problem of incomparability of...

This article has examined the operating cost inefficiencies and economies of scale of Tunisian public water services. We have examined the stochastic frontier model and the fixed effects model. Thus, as formulated, the inefficiency term remains in the model and the fixed effect is intended only...