2SLS with multiple treatments

Manudeep Bhuller and Henrik Sigstad

Journal of Econometrics, 2024, vol. 242, issue 1

Abstract: We study what two-stage least squares (2SLS) identifies in models with multiple treatments under treatment effect heterogeneity. Two conditions are shown to be necessary and sufficient for the 2SLS to identify positively weighted sums of agent-specific effects of each treatment: average conditional monotonicity and no cross effects. Our identification analysis allows for any number of treatments, any number of continuous or discrete instruments, and the inclusion of covariates. We provide testable implications and present characterizations of choice behavior implied by our identification conditions.

Keywords: Multiple treatments; Monotonicity; Instrumental variables; Two-stage least squares (search for similar items in EconPapers)
JEL-codes: C36 (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:econom:v:242:y:2024:i:1:s0304407624001313

DOI: 10.1016/j.jeconom.2024.105785

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