The political economy of migration enforcement : domestic versus border control

We study migration policy enforcement by an elected government. The policymaker faces uncertainty on the supply of migrants, but has more information than the public on its preferences and the extent and effectiveness of its enforcement activities. We show that a utilitarian government preferring more migrants than the majority may find it optimal to set a restrictive target to please the median voter, while relaxing its enforcement to admit more foreigners in a concealed way. Lax enforcement may be achieved either by deploying inadequate resources on cost-effective activities (domestic enforcement) or by allocating a larger budget on less effective tools (border enforcement). The attractiveness of one instrument over the other depends on the size of the immigrant flow: if the supply is large, border enforcement might be preferred because, although more costly, it brings the number of migrants closer to the utilitarian optimum. Hence, re-election concerns might provide a rationale for the widespread use of less effective enforcement tool, such as border control.