The writer is himself an immigrant.
From the International Monetary Fund's Finance & Development symposium, "Rethinking Economics" March 24:
....I used to subscribe to the near consensus among economists that immigration to the US was a good thing, with great benefits to the migrants and little or no cost to domestic low-skilled workers. I no longer think so. Economists’ beliefs are not unanimous on this but are shaped by econometric designs that may be credible but often rest on short-term outcomes. Longer-term analysis over the past century and a half tells a different story. Inequality was high when America was open, was much lower when the borders were closed, and rose again post Hart-Celler (the Immigration and Nationality Act of 1965) as the fraction of foreign-born people rose back to its levels in the Gilded Age. It has also been plausibly argued that the Great Migration of millions of African Americans from the rural South to the factories in the North would not have happened if factory owners had been able to hire the European migrants they preferred....
....MUCH MORE on various other topics.