Perhaps the biggest negative impact of immigration restrictions is the enormous economic cost. Restrictions prevent millions of people from freely seeking employment and other opportunities. Economists estimate that abolishing migration restrictions around the world ...So his idea of "economic cost" means immigrants suffering the cost of not being able to steal your job.
Immigration restrictions also threaten the liberty and property rights of Americans. Most obviously, they curtail American citizens' freedom to associate with immigrants. Jim Crow segregation laws restricted the freedom of association of whites as well as African-Americans.This is a odd view. If freedom of association is what is most important, then you should be all in favor of whites-only country clubs, and the ability to keep Syrian refugees to move into your neighborhood.
In 2014, the Department of Homeland Security concluded that immigration enforcement requires large-scale use of racial profiling in areas where some two-thirds of the U.S. population lives.Put another way, failing to enforce immigration law will result in a non-white invasion of much of the nation.
Somin makes it clear that he does not believe in nations, and favor open borders regardless of the effects on crime, social cohesion, and the quality of life.