1. Entry and exit, product variety and the business cycle;Chatterjee,1993
2. Monopolistic competition and optimum product diversity;Dixit,1975
3. Monopolistic competition and optimum product diversity;Dixit;American Economic Review,1977
4. Innovation and growth in the global economy;Grossman,1991
5. Increasing returns, imperfect markets and trade theory;Helpman,1984