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Outcome-Driven dynamic Refugee assignment with Allocation Balancing

OPERATIONS RESEARCH 2024年第6期72卷 2375-2390页

作者： Bansak, Kirk Paulson, Elisabeth Univ Calif Berkeley Dept Polit Sci Berkeley CA 94720 USA Harvard Sch Business Technol & Operat Management Unit Boston MA 02163 USA

This study proposes two new dynamic assignment algorithms to match refugees and asylum seekers to geographic localities within a host country. The first, currently implemented in a multiyear randomized control trial in Switzerland, seeks to maximize the average predicted employment level (or any measured outcome of interest) of refugees through a minimum-discord online assignment algorithm. The performance of this algorithm is tested on real refugee resettlement data from both the United States and Switzerland, where we find that it is able to achieve near-optimal expected employment, compared with the hindsight-optimal solution, and is able to improve upon the status quo procedure by 40%-50%. However, pure outcome maximization can result in a periodically imbalanced allocation to the localities over time, leading to implementation difficulties and an undesirable workflow for resettlement resources and agents. To address these problems, the second algorithm balances the goal of improving refugee outcomes with the desire for an even allocation over time. We find that this algorithm can achieve near-perfect balance over time with only a small loss in expected employment compared with the employment-maximizing algorithm. In addition, the allocation balancing algorithm offers a number of ancillary benefits compared with pure outcome maximization, including robustness to unknown arrival flows and greater exploration.

关键词： dynamic assignment algorithms stochastic programming load balancing refugee matching machine learning

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