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Shefrin - Behavioral & Neoclassical asset pricing theories - 2008

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Market Efficiency<br />

Sentiment Λ = 0<br />

The market is efficient when the<br />

representative trader, aggregating the<br />

beliefs of all traders, holds objective<br />

beliefs.<br />

<br />

and<br />

i.e., efficiency iff P R = Π<br />

When all investors hold objective beliefs<br />

Φ = (P R /Π) (δ R / δ R , Π ) = 1<br />

Λ = ln(Φ) = 0<br />

Copyright Hersh <strong>Shefrin</strong> <strong>2008</strong><br />

17

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