Edward Quince’s Wisdom Bites: The Six-Foot Man Who Drowned in a Five-Foot Stream

In investing, you don't get extra credit for complexity. In fact, it often just gets you drowned. But there's a simple, two-edged sword that can make or break your entire financial life: leverage.

Leverage is the ultimate double-edged sword in finance—it doesn't add value, but it magnifies both good and bad outcomes. Legendary investor Howard Marks captures this perfectly with a stark warning: "never forget the six-foot-tall person who drowned crossing the stream that was five feet deep on average". To survive, you must get through the low points, and the more leverage you carry, the less likely you are to do so.

This isn't just theory; it's a lesson written in the ruins of financial disasters. Take Long-Term Capital Management (LTCM), which spectacularly collapsed in 1998. Their enormous, leveraged positions in seemingly clever trades, like swap spreads, were so large they couldn't be quickly liquidated when markets turned against them. Similarly, AIG's financial products unit took on massive, concentrated bets by selling credit default swaps—effectively owning hundreds of billions in bonds with borrowed money—which led to staggering losses when the tide went out. As Marks notes, "It’s the presence of debt that creates the possibility of default, foreclosure, and bankruptcy".

The "Idiot Lender Chronicles" offer a modern, satirical take on this same folly: a debt fund CEO advising clients to "underwrit[e] a reduction in rates in two years" to make today's deals work. This is precisely the kind of thinking that ignores the fundamental risk of leverage. As your debt increases, you narrow the range of outcomes you can endure.

The Takeaway: Your goal as an investor isn't just to grow, but to survive. As Warren Buffett advises, "Never risk permanent loss of capital". This means understanding that the real cost of leverage isn't just interest—it's the risk of ruin. Whether you're a hedge fund titan or a personal investor, remember Marks' simple but profound calculus: risk no more than you can afford to lose, and risk enough so that a win is meaningful. If there is no such amount, don't play.