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Consider the Brain Drain argument that is used to explain why poorer countries have a hard time catching and keeping up with already-developed countries. It's

• conanbatt 9y ago
  But someone that could provide enormous value in the future, might not qualify today. It is also a harm in the terms of brain drain. There should be very little doubt on the fact that any restriction will harm everyone in that 'ladder of skill'. It particularly harms those who would acquire those skills later on and dont have them today.