“During the 19th century, tariffs and other barriers restricted international trade in goods and services. However, for the most part, labor was free to enter or leave the United States. Following World War I, the federal government enacted a series of laws restricting immigration. The interwar years also witnessed significant restrictions on trade in goods and services. Market forces are necessary to coordinate the international labor market as well. Increasing the number of H-1B visa’s or temporary work permits is a small step in the right direction but governments can no better plan the international labor market than the Soviets could plan their markets.”
http://www.huffingtonpost.com/ben-powell/immigration-reform-the-ti_1_b_3451173.html
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