Why can three stocks give a frontier northwest of every one of them, and what happens if everybody invests this way?
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A 15–20 year horizon: Buffett's Goldman trade
Record Buffett's September 2008 Goldman Sachs investment as the example of a long horizon, and note how other variables can be built into the framework.
Three-asset portfolio: GM, IBM and Motorola
Write and with all six terms from the covariance matrix, and state where the resulting bullet lies relative to the three stocks.
Equilibrium when everyone follows the theory
State the objection that universal use would break the analysis, the answer that it leads to the Capital Asset Pricing Model, and the role ahead for the tangency portfolio.