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Chris Dillow has a fascinating post on this issue (pointer via New Economist):
Start from the premise that talent is initially unknown, and can only be revealed by working with expensive equipment. So, for example, we can only find out if a manager is any good if he's in charge of a big venture, or if an actor has box office appeal if he's in a mega-costly film. It is, therefore, very expensive to learn who's got talent and who hasn't.
What's more, people with talent cannot offer to share this cost with employers, either because of lack of cash or risk aversion: people don't pay for the chance to become bosses or film stars. In these conditions, what's scarce isn't talent, but revealed talent. There might be loads of people with the ability to be film stars or bosses, but only a handful get the chance to show what they can do.
This study by Berkeley's Marko Tervio shows why.

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