In 2015, there were 77,470,857 visits to the United States from other countries. These visitors brought tremendous benefit: not only did they each spend an average of $4,400 on US goods and services during their stay, but also they helped US firms engage with foreign markets, raise the quality of students here, and help with the diffusion of knowledge. We should want more of these tourists and businesspeople, and the above suggests a real cost to inaccurate visa screening mechanisms—of which blanket bans are a prime example.
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