If porous boundaries and an abundance of weak ties make for a productive industrial cluster, what created these conditions in the Valley? There are two familiar answers. First, California law prevents employers from tying up employees in non-compete agreements; talent is free to go where it pleases, unlike in most states, including Massachusetts. Second, Stanford has been generous in allowing professors to take sabbaticals to work on startups, and this permissiveness has fostered ties between academia and business; in contrast, MIT professors have risked losing tenure if they spent too much
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