I give the author credit for pointing out what should be obvious to investors over the past decade - that the old-school approach of simply building a diversified portfolio, with periodic rebalancing (the buy-and-hold approach) carries high risks. The question then becomes, is there a way to get decent returns with less risk? Those who believe there is generally rely on one of two methods - trying to time the market, and trying to pick winners. The author goes for timing the market.
Extensive studies have shown that timing the market is possible, but only if proven, mechanical methods are used. (See below for books and websites that show you the right way to do this). The success rate drops precipitously as soon as an investor introduces vague or subjective strategies for moving into and out of the market. So the first rule is avoid any timing method that depends on subjective evaluation. The second is to pick a mechanical method that has a record proven with sound statistical methods. The record should tell the investor what annual returns to expect, what volatility to expect, and what maximum draw downs of his portfolio to exepct. THE PERFECT PORTFOLIO approach does none of this. The author tells you his approach is good, but without any proof, and without any statistics on what kinds of risks and rewards you can expect if you try to use his system.
In a nutshell, here is the approach advocated by the author, followed by my issues with it:
Invest a portion of your portfolio in a core buy-and-hold allocation to cash, bonds, US stocks, and Foreign stocks. Then allocation another portion of your portfolio based on timing the market in each of the five asset classes of Gold, Real Estate, Energy, Emerging Markets, and Agriculture. These last five did fairly well in recent years, though with wild volatility in 2007-2009, suffering 50%-60% losses. And if inflation takes off, are likely to be good inflation hedges.
Here are the problems: If buy-and-hold is not a good thing, why use buy and hold on ANY part of the portfolio, including a core position? US Stocks and Foreign stocks in the core position are just as subject to major volatility and losses as are any of the asset classes in the timed part of the portfolio. Even bonds are subject to significant losses if interest rates start to rise. Secondly, the timed portion of the portfolio relies the subjective use of various technical indicators, which are notoriously difficult to use effectively. See the book Evidence Based Technical Analysis by Aronson for a severe critique on the hazards, failures, and weak evidence in support of timing the market with the kinds of technical indicator approaches that the author recommends.
I've read perhaps 40 books an the use of such indicators, and spent several years trying to make money with them. A rare few traders with exceptional discipline and skill (and yes, luck) have been known to do this effectively, and even they have bad stretches. The average investor doesn't stand a chance of making consistent gains this way.
So, where does that leave the investor looking for a safer way to invest than the old-school approach? Fortunately there are some excellent web sites and books which have used the discipline of extensive testing and sound statistical methods to figure out what works, and with what degree of success. The following list should be a good starting point:
The recently published book, The Ivy Portfolio, by Mebane Faber, gets it exactly right. He shows you proven methods for increasing returns and reducing risk, and backs up all his approaches with sound statistical evidence and lots of historical data on the risks and returns you can expect with the several approaches he demonstrates. Faber also has a free paper you can download that will give you a proven and easy-to-follow method for safe investing. The method has averaged gains of about 11.5% a year since 1973, with only one losing year in 2008, and even that losing year had a grand total loss of less than 1 percent. Search for the paper titled A Quantitative Approach to Tactical Asset Allocation. Mebane Faber has a free copy available on his website MebaneFaber. There are no guaranteed, fail-proof ways to invest, but the strategy outlined in this paper comes pretty close.
Another book by an author who has done his homework, and provides a full accounting of risks and rewards and a tested mechanical approach is - Beating The Market, 3 Months At a Time by Gerald Appel. This books would be better for investors who don't wish to invest more than once per three months, and wish to stay in their mutual funds rather than trade through a brokerage account. However, the approach in the book is also well suited to the use of ETFs.
The Decision Moose website offers a free [Update 08-31-11: there is now a modest subscription fee] weekly trading strategy with over ten years of steady, positive returns. He updates his website each Sunday night with witty commentary on the economy and various asset classes. Read his FAQ section to get a quick and clear explanation of how he does it. His exact methods are proprietary, but his general approach is outlined. All you do is put your money where the Decision Moose tells you to each week. He does all the work. This is not to say you trade every week. On average, you only trade once every few months.
Fund manager Ulli Niemann runs a free weekly investment strategy which uses sound, mechanical methods published on his web side Successful Investment. His strategy is detailed on the web site, and uses sound methods for avoiding bear market losses. You can sign up for a free weekly email which keeps you in the loop on when to be in and out of the market, how to hedge (protect) yourself from downside risk, what the best funds to invest are, and so forth. My only reservation with Ulli Niemann's approach is that despite its avoidance of Bear Market down turns, it still relies a bit on subjective market timing. But the wiggle-factor is kept to a minimum, and overall the approach is based on proven methods.
The CXOAdvisory website is THE BEST free [Update 08-30-2011: Many articles now require you to join by paying a modest membership fee.] go-to resource for extensive academic researh on what works and what doesn't in the investing world. The site is updated at least once daily with a new research topic - all very concise, very objective, unbiased, and useful. Especially read his essay titled What Works Best for a summary of academic research on the most effective investment techniques.