Why does a zero-beta stock earn only the risk-free rate however much it swings, and a negative-beta stock even less?
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Capital market line versus security market line
Name both lines and record which assets each one prices, using IBM as an inefficient asset still worth owning and pricing by the beta from the previous video.
Betas of one and zero
Substitute and into the security market line, and record that a zero-beta asset earns while still fluctuating, unlike the risk-free asset.
Negative beta and a return below
Write the hedging argument giving when , note that shorting creates negative beta with negative expected return, and record typical betas of 0.5 to 1.5 and gold miners near zero.