George Borjas, a Harvard professor, decided to revisit David Card's Mariel boatlift study in 2015.
Borjas focused specifically on high school dropouts, a group Card had not isolated in his analysis.
His findings contradicted Card's, showing a significant 10-30% wage drop for high school dropouts in Miami.
Borjas's study suggested that the influx of immigrants did negatively impact the wages of the lowest-skilled workers.
This research overturned Card's pro-immigration findings and sparked controversy both within and outside the field of economics.
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Transcript
Episode notes
We wade into the heated debate over immigrants' impact on the labor market. When the number of workers in a city increases, does that take away jobs from the people who already live and work there? Does a surge of immigration hurt their wages?
The debate within the field of economics often centers on Nobel-prize winner David Card's ground-breaking paper, "The Impact of the Mariel Boatlift on the Miami Labor Market." Today on the show: the fight over that paper, and what it tells us about the debate over immigration.
This episode was hosted by Amanda Aronczyk and Jeff Guo. It was produced by Willa Rubin, edited by Annie Brown, and engineered by Valentina Rodríguez Sánchez. Fact-checking by Sierra Juarez. Alex Goldmark is Planet Money's executive producer.