Identification and Estimation in Discrete Choice Demand Models when Endogenous Variables Interact with the Error

Amit Gandhi, Kyoo il Kim () and Amil Petrin

No 16894, NBER Working Papers from National Bureau of Economic Research, Inc

Abstract: We develop an estimator for the parameters of a utility function that has interactions between the unobserved demand error and observed factors including price. We show that the Berry (1994)/Berry, Levinsohn, and Pakes (1995) inversion and contraction can still be used to recover the mean utility term that now contains both the demand error and the interactions with the error. However, the instrumental variable (IV) solution is no longer consistent because the price interaction term is correlated with the instrumented price. We show that the standard conditional moment restrictions (CMRs) do not generally suffice for identification. We supplement the standard CMRs with new moments that we call "generalized" control function moments and we show together they are sufficient for identification of all of the demand parameters. A major advantage of our setup is that it requires little more than the existence of the same instruments used in this standard IV setting. We run several monte carlos that show our approach works when the standard IV approaches fail because of non-separability. We also test and reject additive separability in the original Berry, Levinsohn, and Pakes (1995) automobile data, and we show that demand becomes significantly more elastic when the correction is applied

JEL-codes: C25 L0 (search for similar items in EconPapers)
Date: 2011-03
Note: IO TWP
References: View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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