What I really love about Siegel is his intent: he wants to educate the average investor and he is not dogmatic. I understand that a handful of negative reviews arise from a credible concern that the stock market could be a lot more hazardous in the future than in the past, but Siegel is not blindly extrapolating into the future. It is pretty unfair to call this "naïve empiricism," by the way. His conclusion is more specific and relative: he believes stocks should outperform bonds, but they will downshift from the long-run historical pattern to outperform bonds by about 2%, give or take.
He reaches this conclusion by showing how the stock market has historically averaged roughly 7% percent in real returns over any long-run stretch. He then presents various alternative valuation models and shares his carefully qualified conclusion: that economic factors justify an modest upward revision in the price-earnings ratio (P-E ratio) to the low 20s, and from that starting point, we might look forward to real equity returns of "4 to 5 percent." Granted, he then goes on to discuss some factors that could well propel returns even higher, and one big unfavorable factor that could send them lower (i.e., the demographic problem of fewer investors in the developed world). But you get to see how his model works, and he serves up each assumption logically and in balanced form so that you can consider the conclusion for yourself. In this vein and offered as a minor critique at the margin, I happen to question his assumption that higher equity valuations per se lead to increased earnings (via cheaper stock offerings and hence cheaper investment capital) because I do not think you can necessarily assume that more capital leads to better investments. Also, he does not address or incorporate the dilution effects of employee stock options.
Similarly, his case for "buy and hold" is balanced. The data in the Chapter on "Stocks and the Business Cycle" could in fact be used to advocate market timing. Siegel shows that successful timing (or more specifically, buying near the bottom) produces impressive returns. He just thinks it is really hard to predict business cycles.
This is the bible of traditional classes, and so I would note that there is no discussion of so-called alternative investments (e.g., hedge fund, private equity, real estates). Also, I missed the lack of an explicit discussion of asset allocation; can we maybe get that in the next edition?
Spend less, save more, and put your savings where they have the best chance to grow.
"Stocks for the Long Run" is Siegel's seminal work (now in its third edition), an excellent introduction to investing for the average investor looking to save for retirement. If the SEC were to choose one book to force people to read before they were allowed to invest their money in the stock market, this book would be it. In fact, the people who lost their retirement money because it was all invested in one stock such as Enron or Worldcom (or a bunch of dot-coms), or who lost a fortune day trading when the market tanked, would have been so much better off if they had just read this book and applied its lessons. They would be better off, the market would be much less volatile, the allocation of capital would be more efficient, the economy would be stronger, and the world would be a better place, if only more people would read this book.
"Stocks for the Long Run" gives you all the knowledge you need to implement a solid investment strategy. Siegel educates and informs (this book will teach you all the basics you need to know to watch CNBC and to understand the market), and he packs his book with as much long-term data and supporting evidence as possible. He is a firm believer in the scientific method and data; he does not posit recommendations unless they are firmly supported by historical evidence.
The good news in the third edition (post 1990s/2000 bubble) is that the case for investing in stocks is still a strong one. Siegel presents extremely persuasive arguments why, long term, stocks hold their value and gain value better than any other type of investment (fundamentally, we must never lose sight of the fact that stocks are claims on real assets and the cash flows generated by enterprises). Surprisingly, stocks are lower risk, long-term, than bonds. Siegel presents some good arguments why stocks now deserve a higher-than-long-term-average P/E, but also shows how index investing (which he still heartily recommends) is distorting the market, and how our expectations for returns from stocks need to come down slightly. He correctly identifies TIPS as the best investment for those seeking short-term safety.
Siegel's main argument is that investors should get into stocks in such a way as to match the overall return of the market, which will provide them with a healthy long-term return on investment. He does show a number of ways to improve on that return and beat the market, such as by recognizing when the market is under and overvalued, thereby buying low and selling high. Thus, I would recommend that a new investor first read, study and apply "Stocks in the Long Run", and then move on to Ben Stein's "Yes You Can Time the Market" as a way to optimize the lessons from "Stocks in the Long Run".