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John Cochrane: Modern Modern Portfolio Theory (EP.169)

The Rational Reminder Podcast

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Return Predictability Does Not Prove Markets Are Inefficient

The expected return on stocks, there ist premium, can vary overtime. Return predictability does not prove markets are inefficient nor do it prove that markets are efficient. It peeks in over business cycle and longer horizons. Stocks are are cheap, high expected returns in bad times. They are expensive, low expected returns in good times. So just th i think we're way to focused on inefficiencies as the only reason for investing.

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