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Policy-relevant causal effect estimation using instrumental variables with interference

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  • Didier Nibbering
  • Matthijs Oosterveen

Abstract

Many policy evaluations using instrumental variable (IV) methods include individuals who interact with each other, potentially violating the standard IV assumptions. This paper defines and partially identifies direct and spillover effects with a clear policy-relevant interpretation under relatively mild assumptions on interference. Our framework accommodates both spillovers from the instrument to treatment and from treatment to outcomes and allows for multiple peers. By generalizing monotone treatment response and selection assumptions, we derive informative bounds on policy-relevant effects without restricting the type or direction of interference. The results extend IV estimation to more realistic social contexts, informing program evaluation and treatment scaling when interference is present.

Suggested Citation

  • Didier Nibbering & Matthijs Oosterveen, 2025. "Policy-relevant causal effect estimation using instrumental variables with interference," Papers 2509.12538, arXiv.org.
    • Handle: RePEc:arx:papers:2509.12538
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    File URL: http://arxiv.org/pdf/2509.12538
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