Why Those Guys Won the Economics Nobels

Harvard Business Review

Campbell’s work has also made liberal use of the analytic tools developed by Hansen. Back in the ‘60s, people developed the capital asset pricing model [CAPM] as a way to do that. And the theory that was available then was CAPM. And in those early tests, it seemed like market prices mostly obeyed both CAPM and the efficient market hypothesis. Fama and Ken French said the rewards in the market don’t just come from beta as the CAPM would have it.

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