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Quantitative Marketing and Economics
This paper explores the equilibrium correspondence of a dynamic quality ladder model with entry and exit using the homotopy method. This method is ideally suited for systematically investigating the economic phenomena that arise as one moves through the parameter space and is especially useful in games that have multiple equilibria. We briefly discuss the theory of the homotopy method and its application to dynamic stochastic games. We then present three main findings: First, the more costly and/or less beneficial it is to achieve or maintain a given quality level, the more a leader invests in striving to induce the follower to give up; the more quickly the follower does so; and the more asymmetric is the industry structure that arises. Second, the possibility of entry and exit gives rise to predatory and limit investment. Third, we illustrate and discuss the multiple equilibria that arise in the quality ladder model, highlighting the presence of entry and exit as a source of multiplicity.
The final publication is available at Springer via http://dx.doi.org/10.1007/s11129-011-9113-4
quality ladder model, dynamic oligopoly, homotopy method
Borkovsky, R. N., Doraszelski, U., & Kryukov, Y. (2012). A Dynamic Quality Ladder Model With Entry and Exit: Exploring the Equilibrium Correspondence Using the Homotopy Method. Quantitative Marketing and Economics, 10 (2), 197-229. http://dx.doi.org/10.1007/s11129-011-9113-4
Date Posted: 27 November 2017
This document has been peer reviewed.