Market Efficiency, Valuation, and Factor Models

Free CAIA Level I lesson in Introduction to Alternative Investments. 44 min read, ~6,591 words.

Market efficiency is cumulative: weak-form reflects past trading data, semi-strong all public information, strong-form all information including insider. Markets settle at an "efficiently inefficient" equilibrium where the marginal cost of skill-based trading equals its marginal revenue. Six drivers of informational efficiency: market value, trading frequency, trading frictions, regulatory constraints, information...

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