A monopolist producing vertically differentiated durable goods can offer in each period a sequence of price-quality menus to segment the market. We show that, contrary Coase conjecture for homogeneous good monopoly, thanks ability produce goods, all Markov-Perfect Equilibria, profit that cannot commit future is bounded below by strictly positive value independent discount factor.

Abstract In the theory of orthogonal polynomials, as well in its intersection with harmonic analysis, it is an important problem to decide whether a given polynomial sequence $$(P_n(x))_{n\in \mathbb {N}_0}$$ ( P n x ) <...