Scale Economies and Natural Monopoly in the Postal Delivery: Comparison Between Parametric and Non Parametric Specifications.

This paper synthesize different econometric models of the postal delivery, estimated using a french data set. These models explain the demand of labor (representing the essential part of the cost) by a vector of outputs (different types of delivered objects) and by geographical characteristics of the office. The data are constructed by a cros-section sample in the set of offices in France and there is no observable variation in the sample of the price of the labor.