Availability of bilateral data on migratory flows has
renewed interest in using gravity models to identify migration determinants
Gravity models have long been popular for analyzing
economic phenomena related to the movement of goods and services, capital, or even
people; however, data limitations regarding migration flows have hindered their use in
this context. With access to improved bilateral (country to country) data, researchers
can now use gravity models to better assess the impacts of migration policy, for
instance, the effects of visa restriction policies on migration flows. The
specification, estimation, and interpretation of gravity models are illustrated in
different contexts and limitations of current practices are described to enable
policymakers to make better informed decisions.
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