This paper enhances the defender model by explicitly modeling the cost associated with quality attributes. It considers two firms and two quality attributes which cause fixed and variable cost, respectively, together with the price attribute. Hence, firms compete in three dimensions. The optimal...

Based on historical data from 1980 to 2004 the paper analyzes the main drivers of mail demand and the impact of e-substitution by using time-series techniques. We find strong evidence for e-substitution. In the second part of the paper we provide forecasts for future mail volumes.

Distortions under the value-added tax (VAT) arise mainly from the exemption of specific services and sectors. This paper develops an analytical model that is applicable to any sector characterized by asymmetric VAT exemptions of services and activities or differentiated VAT rates. We analyze the...

This paper presents a game-theoretic model of a liberalized railway market, in which train operation and ownership of infrastructure are vertically separated. We analyze how the regulatory agency will optimally set the charges that operators have to pay to the infrastructure manager for access...

The focus of our paper is on the competitive effects of the proposed VAT regime relative to selected alternatives. We also highlight the welfare effects of various VAT scenarios. While an exempt operator cannot reclaim VAT paid on inputs (relevant for non-labor inputs only) and therefore faces...

The paper analyzes the impact of different regulatory models on competition and welfare in the Swiss letter market. We conclude that the US system worksharing yields the best results.

The paper first analyzes if there is a need to develop universal postal services in developing countries. We conclude that postal services serve vital functions in economies now and for the foreseeable future. We then discuss regulatory remedies that will foster the evolution of universal postal...