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It's generally better for your whole country if your citizens are employed doing high wage, productive labor rather than having their jobs poached by foreigners who get paid very little send much of their wealth back to their home country. This in practice benefits a very small minority of very wealthy people and doesn't do much for your overall country. It is also better on a state level as well, to (for example) keep Apple in California rather than have them and their jobs leave for Texas, as well as the highly educated citizens you have leaving California for jobs in Texas.