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.

This paper studies the impact of employment subsidies in a simple macroeconomic model with imperfect competition and unemployment due to wage rigidity. COmputed with a simple formula that is robust to the specification of imperfect competition and wage rigidity, subsidies can make an economy...

Cet article etudie le marche de l'assurance quant les compagnies sont mieux informees que l'agent du risque qu'il court.