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

Achim Ahrens, Alessandra Stampi-Bombelli, Selina Kurer and Dominik Hangartner

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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 1,717 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 to assigning the same letter to everyone.

Date: 2023-04, Revised 2024-02
New Economics Papers: this item is included in nep-exp and nep-mig
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Journal Article: Optimal multi‐action treatment allocation: A two‐phase field experiment to boost immigrant naturalization (2024)
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