A general notion of market perfect contestability is introduced. It coincides with the definition given by Baumol et al. under Bertrand competition, but is compatible with other forms of competition : Cournot competition as well as monopolistic competition. Using this notion, we illustrate the...

It is the study of the trade cycle during the thirties that made imperfectly competitive output markets a major theme in macroeconomics, principally under the lead of Harrod. Both him and Keynes were referring at the same time to a supposed feature of business cycles, namely the counter...

We study an endogenous business cycle model with Cournotian monopolistic competition and an endogenous number of firms in each sector. Our model is a simple general equilibrium macroeconomic model introducing overlapping generations both of consumers and firms. Firms strategically decide on...