The policy prescriptions are just as familiar as the villains' names: Raise wages at the bottom. Raise taxes at the top. To those old debates, Alan Greenspan offers up a provocative new idea: Let firms recruit as many brainy foreign employees to American soil as they want. In other words, instead of raising the cap on specialty green cards and H-1B visas, as the Senate-passed immigration bill does, drop the limits altogether.
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