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Optimal multi‐action treatment allocation: A two‐phase field experiment to boost immigrant naturalization

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  • Achim Ahrens
  • Alessandra Stampi‐Bombelli
  • Selina Kurer
  • Dominik Hangartner

Abstract

Research underscores the role of naturalization in enhancing immigrants' socio‐economic integration, yet application rates remain low. We estimate a policy rule for a letter‐based information campaign encouraging newly eligible immigrants in Zurich, Switzerland, to naturalize. The policy rule assigns one out of three treatment letters to each individual, based on their observed characteristics. We field the policy rule to one‐half of 1717 immigrants, while sending random treatment letters to the other half. Despite only moderate treatment effect heterogeneity, the policy tree yields a larger, albeit insignificant, increase in application rates compared with assigning the same letter to everyone.

Suggested Citation

  • Achim Ahrens & Alessandra Stampi‐Bombelli & Selina Kurer & Dominik Hangartner, 2024. "Optimal multi‐action treatment allocation: A two‐phase field experiment to boost immigrant naturalization," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 39(7), pages 1379-1395, November.
    • Handle: RePEc:wly:japmet:v:39:y:2024:i:7:p:1379-1395
    DOI: 10.1002/jae.3092
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