Semiparametric Instrumental Variables Estimation and Its Application to Dynamic Oligopoly
This paper considers a semiparametric regression model in which the error term is correlated with the nonparametric part. An example of this regression model can be found in structural models of dynamic oligopoly. Dynamic oligopoly is a situation in which firms' price-settings (or quantity-settings) are strategically interdependent and have durable effects on the stream of their profits. Dynamic oligopoly fits many industries characterized by the significance of network externalities, learning-by-doing, and informational product differentiation. For a dynamic structural model of the representative agent, the Euler-equation-based estimation technique is usually employed. However, the Euler equations cannot be generally obtained in dynamic oligopoly. As an alternative, we can consider an estimation procedure as follows. Under some regularity conditions, a firm's optimal pricing (or quantity-setting) in dynamic oligopoly can be formulated as a continuous Markov decision problem (MDP). Then we may apply an estimation procedure similar to the nested fixed point algorithm: using ad hoc assumptions for stochastic specification of the evolution of state variables, we may calculate each firm's value functions in equilibrium for each candidate value of the parameter vector and then search for the value of the parameter vector that maximizes the (log) likelihood function or minimizes some distance. It is, however, impractical to implement this estimation procedure in the case of dynamic oligopoly. Most of all, it will result in a prohibitive computational burden. It is well known that continuous MDPs have the problem of Bellman's curse of dimensionality. Even with some simple discretization assumptions and a stochastic algorithm to break the curse of dimensionality, the computational burden to calculate the equilibrium value functions for just one candidate value of the parameter vector is usually huge. In addition, the complexity of the estimation problem usually makes it difficult to determine the robustness of the conclusions to the ad hoc stochastic assumptions. Furthermore, if the stochastic process is misspecified, the estimator for the parameter vector is generally inconsistent. The estimation procedure suggested in this paper, however, enables us to semiparametrically estimate a class of structural models of dynamic oligopoly. It will be shown that first-order profit maximization conditions of dynamic oligopoly may lead to our generic semiparametric regression model. A technical difficulty of this semiparametric regression model, however, is that we can not eliminate the nonparametric part in the two-step estimation procedure of a typical semiparametric regression model. Yet, we can still obtain a semiparametric estimator, called a semiparametric instrumental variables (SIV) estimator, with consistency and asymptotic normality if there exist two sets of instrumental variables (IVs) satisfying both an identification condition and an orthogonality condition. Our estimation plan is as follows. In order to eliminate the nonparametric part, we first filter the nonparametric part by the first set of IVs. For identification, we need the second set of IVs which is not a function of the first set of IVs and must be orthogonal to the filtering error. The paper provides two generic examples in which we can construct these two sets of IVs and then discusses an empirical example of the application of the SIV estimation procedure to estimate network effects in the U.S. home VCR market during the years 1981 - 1988.
|Date of creation:||01 Aug 2000|
|Contact details of provider:|| Phone: 1 212 998 3820|
Fax: 1 212 995 4487
Web page: http://www.econometricsociety.org/pastmeetings.asp
More information through EDIRC
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Ariel Pakes, 1991. "Dynamic Structural Models: Problems and Prospects. Mixed Continuous Discrete Controls and Market Interactions," Cowles Foundation Discussion Papers 984, Cowles Foundation for Research in Economics, Yale University.
- Whitney K. Newey & James L. Powell & Francis Vella, 1999.
"Nonparametric Estimation of Triangular Simultaneous Equations Models,"
Econometric Society, vol. 67(3), pages 565-604, May.
- Whitney K. Newey & James L. Powell & Francis Vella, 1998. "Nonparametric Estimation of Triangular Simultaneous Equations Models," Working papers 98-6, Massachusetts Institute of Technology (MIT), Department of Economics.
- Whitney Newey & James Powell & Francis Vella, 1998. "Nonparametric Estimation of Triangular Simultaneous Equations Models," Working papers 98-16, Massachusetts Institute of Technology (MIT), Department of Economics.
- Pakes, Ariel & Pollard, David, 1989. "Simulation and the Asymptotics of Optimization Estimators," Econometrica, Econometric Society, vol. 57(5), pages 1027-1057, September.
- Ariel Pakes & Paul McGuire, 1997. "Stochastic Algorithms for Dynamic Models: Markov Perfect Equilibrium, and the 'Curse' of Dimensionality," Cowles Foundation Discussion Papers 1144, Cowles Foundation for Research in Economics, Yale University.
- Chunrong Ai, 1997. "A Semiparametric Maximum Likelihood Estimator," Econometrica, Econometric Society, vol. 65(4), pages 933-964, July.
- Berry, Steven & Levinsohn, James & Pakes, Ariel, 1995. "Automobile Prices in Market Equilibrium," Econometrica, Econometric Society, vol. 63(4), pages 841-890, July.
- Schmalensee, Richard, 1982.
"Product Differentiation Advantages of Pioneering Brands,"
American Economic Review,
American Economic Association, vol. 72(3), pages 349-365, June.
- Schmalensee, Richard., 1980. "Product differentiation advantages of pioneering brands," Working papers 1140-80., Massachusetts Institute of Technology (MIT), Sloan School of Management.
- Pakes, Ariel & Olley, Steven, 1995.
"A limit theorem for a smooth class of semiparametric estimators,"
Journal of Econometrics,
Elsevier, vol. 65(1), pages 295-332, January.
- Ariel Pakes & Steven Olley, 1994. "A Limit Theorem for a Smooth Class of Semiparametric Estimators," Cowles Foundation Discussion Papers 1066, Cowles Foundation for Research in Economics, Yale University.
- Chamberlain, Gary, 1992. "Efficiency Bounds for Semiparametric Regression," Econometrica, Econometric Society, vol. 60(3), pages 567-596, May.
- Hansen, Lars Peter & Singleton, Kenneth J, 1982. "Generalized Instrumental Variables Estimation of Nonlinear Rational Expectations Models," Econometrica, Econometric Society, vol. 50(5), pages 1269-1286, September.
- Donald W.K. Andrews, 1988.
"Asymptotic Normality of Series Estimators for Nonparametric and Semiparametric Regression Models,"
Cowles Foundation Discussion Papers
874R, Cowles Foundation for Research in Economics, Yale University, revised May 1989.
- Andrews, Donald W K, 1991. "Asymptotic Normality of Series Estimators for Nonparametric and Semiparametric Regression Models," Econometrica, Econometric Society, vol. 59(2), pages 307-345, March.
- Steven T. Berry, 1994. "Estimating Discrete-Choice Models of Product Differentiation," RAND Journal of Economics, The RAND Corporation, vol. 25(2), pages 242-262, Summer.
- Hansen, Lars Peter, 1982. "Large Sample Properties of Generalized Method of Moments Estimators," Econometrica, Econometric Society, vol. 50(4), pages 1029-1054, July.
- Richard Ericson & Ariel Pakes, 1995. "Markov-Perfect Industry Dynamics: A Framework for Empirical Work," Review of Economic Studies, Oxford University Press, vol. 62(1), pages 53-82.
When requesting a correction, please mention this item's handle: RePEc:ecm:wc2000:0432. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Christopher F. Baum)
If references are entirely missing, you can add them using this form.