The Most Important Thing: Uncommon Sense for the Thoughtful Investor (Columbia Business School Publishing)

by Howard Marks

Extreme volatility and loss surface only infrequently. And as time passes without that happening, it appears more and more likely that it’ll never happen—that assumptions regarding risk were too conservative. Thus, it becomes tempting to relax rules and increase leverage. And often this is done just before the risk finally rears its head. As Nassim Nicholas Taleb wrote in Fooled by Randomness: Reality is far more vicious than Russian roulette. First, it delivers the fatal bullet rather infrequently, like a revolver that would have hundreds, even thousands of chambers instead of six. After a few dozen tries, one forgets about the existence of a bullet, under a numbing false sense of security. . . . Second, unlike a well-defined precise game like Russian roulette, where the risks are visible to anyone capable of multiplying and dividing by six, one does not observe the barrel of reality. . . . One is thus capable of unwittingly playing Russian roulette—and calling it by some alternative “low risk ” name.