We provide a theoretical justification for bi-sourcing, which refers to thesituation where a final goods producer buys an input from an outside supplier and alsoproduces it in-house. Bi-sourcing occurs if the marginal cost of producing the input inhouseis higher than the marginal cost of outside...

Common wisdom suggests that entry reduces profits of the incumbentfirms. On the contrary, we show that if the incumbents differ in marginal costs and theentrants behave like Stackelberg followers, entry may benefit the incumbents who arerelatively cost efficient while it always hurts the cost...

This paper re-considers the comparison of Bertrand and Cournot equilibria in a differentiatedduopoly with linear demand and cost functions. It focuses on the case of substitutegoods, and allows for cost asymmetries between firms. The main finding is that, when thedegree of cost asymmetry is...