To: Dan Duchardt who wrote (16248 ) 2/10/2003 10:29:32 PM From: macavity Respond to of 19219 From Fleck@RealMoneythestreet.com Brit-Lambasted Bull: Meantime, the mania's aftermath has seen no shortage of investing myths masquerading as truths. But a study by three academics from the London Business School, which is reported in a great story (buried on the last page) in today's Wall Street Journal titled "Long-Term Risk Is Underestimated," goes a long way toward debunking these myths. To begin with, Professors Elroy Dimson, Paul Marsh and Mike Staunton dispel the buy-and-hold notion by observing that "not only can markets take a long time to recover, but also investors generally underestimate what the safe long-run period is to hold stocks." ......... .......That's pretty staggering. Most people feel it's a slam-dunk that they're going to win over 20 years. Of course, that presupposes they won't fall prey to another problem, which is survivor bias. It's quite possible that even if the market worked out over 20 years, the handful of stocks they picked might not, as most people who bought Internet stocks can now see clearly. Chiseled-in-Stone-Cold Comfort: The professors then highlight the myth and risk of "basing expectations on past returns." They point out that "historical analysis can never reveal the full range of century-long returns that might have been experienced by investors [the emphasis is mine] . An individual country confronts many possible futures but can report only one past." So, this should be food for thought for most people, who automatically assume that things will work out over time. Further, it should alter the fundamental notion of risk -- from the "risk" that the market will take off without you, to the risk that you will make an investment and then be forced to sell at a price considerably less than what you paid for it. The article also explodes one of the present-day myths that I refer to as arm-waving. You know, the market's been down three years in a row, and therefore it can't decline for a fourth, as posited by so many pundits. The professors' response to that: "The history of stock market performance shows that across 16 markets, the probability of a fourth down year is 40%. That also happens to be the probability of any other year being a down year." ....................... Just like a coin toss, the odds have not really changed due to the past 3 years ..............So, falling rates don't guarantee higher prices. Three down years don't guarantee an up year this year. The Fed cutting rates doesn't guarantee that things will get better. There are no absolutes in investing. All one can do is to try to assess the probabilities of what the potential outcomes might be, and incorporate those probabilities, as best the circumstances permit, into managing risk (defined as the chance that you will lose meaningful amounts of money) and reward. We're all going to be wrong in our investments from time to time. The trick is to not get carried out when you make your mistakes. thestreet.com © 1996-2003 TheStreet.com, Inc. All rights reserved. -macavity