We analyse the incidence of ad valorem and unit excise taxes in an oligopolistic industry with diffentiated products and price-setting (Bertrand) firms.

This paper considers the relative efficiency of ad valorem and unit selective sales taxes in imperfectly competitive market. We provide a simple proof of the proposition that ad valorem taxes are welfare-superior to unit taxes in the short run whenproduction costs are identical across firms.

Les quelques remarques presentees ici veulent attirer l'attention sur certains effets remarquables des styles de decision lorsque la decision est elle-meme un processus collectif, qui prend place dans un paysage reconnaissable a certaines caracteristiques specifiques. Le texte donne quelques...

Cet article presente un modele visant a mesurer l'impact de l'accessibilite dans un systeme de transport. Le modele propose integre deux elements majeurs: le prix des biens et le cout de transport. L'impact de ces deux variables a ete explore sous diverses directions: variation d'accessibilite,...

We consider a market in which a public firm completes against private ones, and ask what happens when the public firms is privatized. In the short run, privatization is harmful because prices rise: the disciplinary role of the public firm is lost. In the long run, privatization, leads to further...

A model is presented to describe the dynamics of transportation mode choice in which the interaction between transportation users and a public transportation authority results in self-organization. The model illustrates that a sufficient number of connections between a central city and its...

This paper presents new models and methodologies for the assessment of innovative urban transport systems and policies options. The dynamic traffic model METROPOLIS (used here in the framework of the EC project AIUTO) estimates the impact of a set of transport demand management measures on the...