Can entrepreneurship really be taught? The University of Arizona thinks so. It polled its Eller B-school alums to compare how graduates of the entrepreneurship program fared vs. those with a standard MBA. The E-grads were more often self-employed, had higher incomes, and were likelier to start businesses. Even entrepreneurship grads toiling at big companies earned more than other B-schoolers. Still, it could be that those who already had the right stuff chose to join the program. "It's a chicken-egg problem," concedes researcher Alberta Charney.

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