I was surprised to see that the modest expectations for returns from equities (“real returns from stocks can be expected to be in the neighbourhood of 4% to 5%”) assumed in the post on Smith Manoeuvre earlier this week came in for some criticism. Fortunately for me, among the “experts” counselling investors to temper their expectations are John Bogle and Warren Buffett.

John Bogle makes a persuasive case for modest returns from stocks and bonds in his Little Book of Common Sense Investing (read review here). He repeated it in an interview with Fortune magazine in December 2007:

Well, the Dow is a peculiar piece of work. The Dow yield is 2.2 percent now, vs. the S&P’s 2 percent. Since I’m expecting a 6 percent to 7 percent return on stocks, the Dow ought to grow at 4 percent to 5 percent a year. So over ten years, growing 4.5 percent a year, it would grow by 55 percent and so it would be slightly over 20,000, give or take. But anybody who is expecting that ought to be prepared for a lot of bumps along the way.

Warren Buffett’s annual letter to shareholders also made the case for modest equity returns in this century:

Dividends continue to run about 2%. Even if stocks were to average the 5.3% annual appreciation of the 1900s, the equity portion of plan assets – allowing for expenses of .5% – would produce no more than 7% or so. And .5% may well understate costs, given the presence of layers of consultants and high-priced managers (“helpers”).

Naturally, everyone expects to be above average. And those helpers – bless their hearts – will certainly encourage their clients in this belief. But, as a class, the helper-aided group must be below average. The reason is simple: 1) Investors, overall, will necessarily earn an average return, minus costs they incur; 2) Passive and index investors, through their very inactivity, will earn that average minus costs that are very low; 3) With that group earning average returns, so must the remaining group – the active investors. But this group will incur high transaction, management, and advisory costs. Therefore, the active investors will have their returns diminished by a far greater percentage than will their inactive brethren. That means that the passive group – the “know-nothings” – must win.

I should mention that people who expect to earn 10% annually from equities during this century – envisioning that 2% of that will come from dividends and 8% from price appreciation – are implicitly forecasting a level of about 24,000,000 on the Dow by 2100. If your adviser talks to you about double-digit returns from equities, explain this math to him – not that it will faze him. Many helpers are apparently direct descendants of the queen in Alice in Wonderland, who said: “Why, sometimes I’ve believed as many as six impossible things before breakfast.” Beware the glib helper who fills your head with fantasies while he fills his pockets with fees.

While anything can happen in the markets, it is more likely that Mr. Bogle and Mr. Buffett are right and it is prudent to have modest return expectations from equities.