Forty-six years ago, Dade County, home to Miami, recorded an increase of 80,500 residents between April 1 and July 1, 1980, coinciding with the large-scale arrival of Cuban immigrants during the Mariel Boatlift. This migration wave was one of the largest sudden population inflows into a U.S. city and expanded Miami’s labor force by approximately 7% in just a few months, making it an exceptional case study for economists and social scientists.
In a landmark paper published in 1990, economist David Card examined how this sudden influx affected Miami’s labor market. Comparing Miami with several similar U.S. cities, he found that despite the sharp increase in labor supply—particularly in lower-skilled occupations—there was no significant decline in wages or increase in unemployment among less-skilled native workers. Even among Cuban immigrants who had settled in Miami before the Mariel Boatlift, he found little evidence of a substantial deterioration in labor market outcomes.
The study suggests that Miami’s labor market was able to absorb the new arrivals rapidly thanks to a combination of factors: an economy that had been shaped by decades of immigration, a productive structure with labor-intensive industries, and the adaptability of both firms and workers. Card also cautioned that Miami represented a unique case and that its findings should not be automatically generalized to other settings. Nevertheless, the study remains one of the strongest pieces of empirical evidence on the labor market effects of a sudden immigration shock.
Research of this kind helps counter the common fear, often heightened during periods of large-scale immigration, that the arrival of new workers will inevitably lead to job losses or lower wages for the native-born population. In reality, labor market outcomes are shaped by many factors—including the business cycle, the structure of the economy, workers’ skills, and the labor market’s capacity to adapt. For this reason, sound public policy should be informed by lessons from past experiences and by the best available scientific evidence on social impacts, rather than relying solely on prejudice or intuition.
Primary Education Teacher.
Currently working on his doctoral thesis at the Universitat Rovira i Virgili (URV).