This note corrects some oversights in Dong and Yuan (2010). We show, in particular, that their condition for intra-industry trade to reduce global welfare can never be satisfied. Using a new example, we demonstrate that, nevertheless, their fundamental insight remains correct: Under Cournot...

The paper first demonstrates that in a simple asymmetric n-country world with Cournot competition, constant returns and linear demand, free trade can reduce world welfare as well as total output and consumer surplus. We then derive precise conditions for free trade to raise a country's welfare,...

The paper investigates prices and the deadweight loss in multi-product monopoly (MPM) with linear demand and constant marginal costs. We examine MPM with three commonly used demand structures: standard heterogeneous products, vertically (quality) and horizontally (spatially) differentiated...

This paper investigates the pass-through of an excise tax imposed on a monopoly firm with constant marginal cost. The optimal price increases as tax increases for any demand function. Tax pass-through is globally under or in excess of 100% according as the direct demand function is log-concave...

Recent U.S. legislation (Gramm-Leach-Bliley Act) allows commercial banks to enter merchant banking, i.e. hold equity in non-financial firms. A stylised auction-theoretic model is developed to investigate the effects of bank equity stakes in firms on the competition in bank loans. The main...

The paper derives clear-cut and robust conclusions on the effects of sharing firm-specific information in general linear oligopoly. In Cournot (Bertrand) oligopoly, revealing (concealing) firm-specific cost information is the dominant strategy for each firm. In both competition modes firms have...