The possibility of a convex industry demand function's leading to two local profit maxima for a monopolist supplier is found to extend to a model of monopolistic competition where two classes of consumers are distinguished by their relative demand for the industry's products. A long-run,...

An informal club has members who contribute to the production of a public good to achieve status. Contributions are either in the form of money or work. A signaling equilibrium is found where full separation occurs and efficient choices are made whether to contribute in terms of work or money....