2023-07-18-IMF-迁移_搜索和技能异质性_41页_2mb

Migration, Search and Skill Heterogeneity Summary

This paper examines the impact of cross-border migration on the business cycle stability of origin countries, with particular attention to the skill composition of migrating labor. The paper argues that migration can have unintended consequences for business cycle stability if concentrated in skilled workers, as it may lead to "brain drain" effects that reduce supply capacity in the origin country despite relieving unemployment pressures.

The analysis employs a small open economy Dynamic Stochastic General Equilibrium (DSGE) model that incorporates endogenous migration flows, search and matching frictions, trade linkages, and skill heterogeneity. This framework is applied to the case of Greek emigration during the European Debt Crisis. The findings demonstrate that migration flows exacerbated the recession rather than stabilizing it. A key result is that emigration led to a more than 15 percentage point drop in investment, deepening and prolonging the recession due to negative compositional effects and skill imbalances.

Migration's amplifying effect stems from two main mechanisms: capital–skill complementarities, which reduce the productivity of capital when skilled labor is scarce, and search frictions, which amplify the reduction in vacancies for skilled workers. These factors interact to magnify the adverse impact on investment and output.

The paper concludes that migration is an incomplete adjustment mechanism depending on the skill composition of migrants, and policymakers should consider the skill-specific effects of migration in their models of macroeconomic adjustment.