We consider a dynamic voluntary advertising model with a duopoly. Firms can use advertising and price as competitive tools where product quality is a given and the market is not fully covered by consumers. Advertising also plays a role as a public good. In this situation, we investigate how...

Using a differential game, we analyze a multiple agent economy in which there are common and private capital stocks. Each interest group can access the common capital and its own private capital stocks but not anyone else's private capital stocks. Considering the situation in which each interest...