Why can a small investor think in returns while a firm deciding how much to invest has to think in dollars of NPV?
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Small investors versus a firm's own projects
State the CAPM assumption that investors are small and take returns as given, and contrast a firm putting its capital into one division, whose investment changes that project's return.
The declining NPV of the marginal dollar
Record that a good-NPV project is scaled up while the NPV of each extra dollar falls, sketch total NPV against the amount invested, and cite the subprime mortgage market as the example.
Investing until marginal benefit equals marginal cost
State the economic stopping rule, contrast it with the common practice of investing until money is lost, and note that very large funds need price-impact techniques this course does not develop.