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Brad DeLong 🖖🏻 @delong
, 5 tweets, 3 min read Read on Twitter
@Noahpinion @BCAppelbaum EMH is a reasonable theory of short run _returns_. It is a lousy theory of values. And it is an even lousy her theory of price movements. Fans and co’s inability to distinguish between those three at all eas what convinced me they were morons... 1/
@Noahpinion @BCAppelbaum Also Merton, Scholes, and Fama’s is pretending that there was an EMH explanation for black Monday in 1987 2/
@Noahpinion @BCAppelbaum Also their trying to do macro 3/END
@Noahpinion @BCAppelbaum Perhaps this is best explained by resorting to Isaiah Berlin’s metaphor of hedgehogs and foxes. Foxes are useful and valuable to listen to because they know a lot about a complicated world. Hedgehogs know one thing and have negative knowledge of the rest of the world. 1/
@Noahpinion @BCAppelbaum Hedgehogs are poisonous morons to corrupt your mind. Hedgehogs can be useful in the information ecology if the one thing they know is underweighted In the intellectual portfolio. But that they can be useful does not make them smart, & definitely does not make them wise 2/END
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