Keeping migration low is the best way to raise Americans’ prosperity, says a study funded by the leading lobby group for investors who want mass migration.

“At medium and low immigration levels, labor-based [skilled professional] immigration, characterized by fewer but more skilled population, produces higher GDP [Gross Domestic Product] per capita [emphasis added] growth,” compared to mass inflow of migrants and their extended families, says the September study by Springer, titled “Demographic and Economic Implications of Alternative U.S. Immigration Policies.”

The 2021 report’s promise of a 3 percent per-capita gain over 30 years “is a tiny…

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