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:it means market efficiency can only be jointly tested what a given model of equilibrium expected returns.

-This means that we can't ever be sure what the correct model of expected returns is.

-In other words, we can only decide if markets are efficient if we assume that we know what risks investors care about, and how they are priced.

-There are lots of models of expected returns, and we don't know which one is correct. Ex. CAPM, fAMA French, Liquidity, Macro risk, Beta.

-We can only say that he market is or isn't efficient with respect to that model, but we can't say overall whether the market efficiency is independently true

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13y ago
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Q: What is joint hypothesis problem?
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