This paper investigates the economic consequences of illegal migration in the Ramsey-type dynamic optimizing context. In contrast to the conclusions of an article of Hazari and Sgro (2003), we show that with a Cobb-Douglas production function illegal migration unambiguously reduces the per-capita domestic consumption growth, whereas necessarily raises the long-run per-capita consumption of domestic residents when production is “sufficiently” reactive to capital changes. Our findings are consistent with several empirical studies and simulation analyses, suggesting that changes in technological adjustment in response to migrants inflows may take some years to translate into productivity, generating some crowding out effects. The gains for natives are likely to materialize in the long run when the specialization of natives adjusts, firms invest in capital and adopt appropriate technologies.
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