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The Index Fund "Tipping Point" (EP.225)

The Rational Reminder Podcast

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Market Efficiency Improves if Informed Active Investors Switch to Indexing

In equilibrium, investors combine what they deem to be the tangency portfolio with risk free borrowing or lending. The paper shows that if misinformed and uninformed active investors who make prices less efficient by trading, switch to market cap indexing, market efficiency actually improves. If you've got a bunch of misinformed active managers, there's a pretty good chance the market portfolio is actually sub optimal.

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