THE HETEROGENEITY OF IMMIGRANTS,HOST COUNTRIES' INCOME AND PRODUCTIVITY: A CHANNEL ACCOUNTING APPROACH

This article exploits changes in the distribution of immigrants across 20 Organization for Economic Co‐operation and Development countries from 1960 to 2005 in order to assess their contribution to income of destination countries. The non‐random sorting of immigrants across countries is addressed by using an instrumental variable strategy. The instrument is built by estimating a bilateral migration model incorporating exogenous origin country determinants of migration. Aggregate results reveal that immigrants have a positive effect on income that works primarily through total factor productivity (TFP). We further construct a novel dataset from censuses and labor force surveys to explore the information on the age of immigrants. Contrasting income effects are found across age groups: a higher share of immigrants among the youth has a negative impact on aggregate income, while a higher share of immigrants among prime‐aged workers has a positive effect. We interpret this disparity as short‐term versus medium‐term effects. Adjustments over time involve changes in TFP but also in the human capital of the native‐born. (JEL F22, J24, J31, O31)