I won’t repeat comments from my first review.  I’ll stick to material that either I chose not to comment on earlier, or is new in this edition.

Bonds and Inflation

“Yale economist Irving Fisher” has had a “long-held belief that bonds were overrated as safe investments in a world with uncertain inflation.”  Investors learned this lesson the hard way recently as interest rates spiked at a time when long-term bonds paid ultra-low returns.  This created double-digit losses in bond investments, despite the perception that bonds are safe.  Siegel adds “because of the uncertainty of inflation, bonds can be quite risky for long-term investors.”

The lesson here is that inflation-protected bonds offer lower risk, and long-term bonds are riskier than short-term bonds.

Mean Reversion

While stock returns look like a random walk in the short term, Figure 3.2 in the book shows that the long-term volatility of stocks and bonds refutes the random-walk hypothesis.  Over two or three decades, stocks are less risky than the random walk hypothesis would predict, and bonds are riskier.

Professors Robert Stombaugh and Luboš Pástor disagree with this conclusion, claiming that factors such as parameter and model uncertainty make stocks look riskier a priori than they look ex post.  Siegel disagrees with “their analysis because they assume there is a certain, after inflation (i.e., real) risk-free financial instrument that investors can buy to guarantee purchasing power for any date in the future.”  Siegel says that existing securities based on the Consumer Price Index (CPI) have flaws.  CPI is an imperfect measure of inflation, and there is the possibility that future governments will manipulate CPI. Continue Reading…