Border Migration Analysis

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We examine illegal immigration in the United States from Mexico over the period 1976-1995. One challenge is that we do not observe the number of individuals that attempt to enter the United States illegally; we only observe the number of individuals apprehended attempting to cross the U.S.-Mexico border illegally. Based on a simple migration model, we postulate the existence of an apprehensions function, which expresses apprehensions at the border as a function of illegal attempts to cross the border and U.S. border-enforcement effort. We estimate a reduced-form apprehensions function using monthly data on apprehensions at the U.S.-Mexico border, person hours the U.S. Border Patrol spends policing the border, and wages in the United States

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