Testing Firm Conduct

Marco Duarte, Lorenzo Magnolfi, Mikkel S{\o}lvsten and Christopher Sullivan
Authors registered in the RePEc Author Service: Mikkel Sølvsten

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Abstract: Evaluating policy in imperfectly competitive markets requires understanding firm behavior. While researchers test conduct via model selection and assessment, we present advantages of Rivers and Vuong (2002) (RV) model selection under misspecification. However, degeneracy of RV invalidates inference. With a novel definition of weak instruments for testing, we connect degeneracy to instrument strength, derive weak instrument properties of RV, and provide a diagnostic for weak instruments by extending the framework of Stock and Yogo (2005) to model selection. We test vertical conduct (Villas-Boas, 2007) using common instrument sets. Some are weak, providing no power. Strong instruments support manufacturers setting retail prices.

Date: 2023-01, Revised 2024-01
New Economics Papers: this item is included in nep-ecm
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Journal Article: Testing firm conduct (2024)
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Persistent link: https://EconPapers.repec.org/RePEc:arx:papers:2301.06720

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