We investigate a desirable role of public enterprise in mixed oligopoly in free-entry markets. We compare the following three cases: (i) a public firm produces before private firms (public leadership), (ii) all firms produce simultaneously (Cournot), (iii) a public firm produces after private...

We investigate, considering disposal and recycling activities after the consumption of products, the models that explicitly incorporate both the product market and the recycling market. In the field, the deposit-refund (D-R) policy has been discussed as an ideal policy to internalize disposal...

We investigate the relationship between the Herfindahl-Hirschman Index (HHI) and welfare. First, we discuss the model wherein m leaders and N - m followers compete. Daughety (1990) finds that under linear demand and constant marginal cost, the Stackelberg model yields larger welfare and HHI than...

I investigate the optimal environmental tax under a policy based on extended producer responsibility (EPR) in oligopoly markets. I introduce the recycling market and explicitly consider how these policies affect the incentive for recycling. I derive the optimal tax rule, which depends on the...