4

Risk and return I: Portfolios

Most investors don’t put all their money in just one asset but in a portfolio of assets. This begs the question of how to estimate the risk and return of a portfolio, as opposed to those of an individual security, which is the issue we’ll discuss in this chapter. We’ll also discuss a few related concepts, such as feasible sets, efficient sets, and the minimum variance portfolio.

Two assets: Risk and return

Let’s kick off this discussion by considering the annual returns of AT&T and Bank of ...

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