Nonparametric Identification of Demand without Exogenous Product Characteristics

Fuente: arXiv
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Main Authors: Borusyak, Kirill, Chen, Jiafeng, Hull, Peter, Lei, Lihua
Format: Preprint
Published: 2025
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author Borusyak, Kirill
Chen, Jiafeng
Hull, Peter
Lei, Lihua
author_facet Borusyak, Kirill
Chen, Jiafeng
Hull, Peter
Lei, Lihua
contents We study identification of differentiated product demand from market-level data when product characteristics can be endogenous. Past work suggests nonparametric identification may be impossible: that is, in addition to standard price instruments, exogenous characteristic-based instruments are essentially necessary to identify sufficiently flexible demand models with standard index restrictions. We show, however, that price counterfactuals are nonparametrically identified using recentered instruments -- which combine exogenous price instruments with possibly endogenous product characteristics -- under a weaker index restriction and a new condition we term faithfulness. We argue that faithfulness, like the usual completeness condition for nonparametric instrumental variable identification, is best viewed as a technical requirement on the strength of identifying variation rather than a substantive economic or statistical restriction. We show the two conditions are closely related, though generally distinct. We conclude with several practical implications for the parametric estimation of demand counterfactuals.
format Preprint
id arxiv_https___arxiv_org_abs_2512_23211
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Nonparametric Identification of Demand without Exogenous Product Characteristics
Borusyak, Kirill
Chen, Jiafeng
Hull, Peter
Lei, Lihua
Econometrics
Statistics Theory
Methodology
We study identification of differentiated product demand from market-level data when product characteristics can be endogenous. Past work suggests nonparametric identification may be impossible: that is, in addition to standard price instruments, exogenous characteristic-based instruments are essentially necessary to identify sufficiently flexible demand models with standard index restrictions. We show, however, that price counterfactuals are nonparametrically identified using recentered instruments -- which combine exogenous price instruments with possibly endogenous product characteristics -- under a weaker index restriction and a new condition we term faithfulness. We argue that faithfulness, like the usual completeness condition for nonparametric instrumental variable identification, is best viewed as a technical requirement on the strength of identifying variation rather than a substantive economic or statistical restriction. We show the two conditions are closely related, though generally distinct. We conclude with several practical implications for the parametric estimation of demand counterfactuals.
title Nonparametric Identification of Demand without Exogenous Product Characteristics
topic Econometrics
Statistics Theory
Methodology
url https://arxiv.org/abs/2512.23211