What Warren Buffett’s Right-Hand Man Can Teach You About Success (and Avoiding Costly Mistakes)

While Warren Buffett is well-known for making significant investments that have paid off in multiples, his business partner at Berkshire Hathaway Inc. (BRK.A, BRK.B) and right-hand man, Charlie Munger, took a more subdued approach.

Instead of swinging for the fences, Munger advocated for a bit of caution: avoid those big mistakes that can wipe you out entirely. As he famously quipped, “Avoiding stupidity is better than seeking brilliance.”

The Core Philosophy: Avoid Catastrophic Losses

While some investors chase headlines for the next big thing, Munger, who passed away in 2023 at the age of 99, consistently advocated for maintaining a margin of safety. Indeed, while “don’t lose money” seems like a banal lesson taught to new investors, Munger has raised it to an art form.

The insight is deceptively simple: wealth compounds over time, but only if you protect your capital from permanent impairment. Just one catastrophic loss could wipe out years, or even decades, of investment gains. Think of long-term shareholders of Enron or Lehman Brothers before they spectacularly imploded.

Simple math reveals why loss avoidance is preferred over gain-seeking. If your portfolio drops 50%, you need 100% returns just to break even. A 75% drawdown requires 300% gains for recovery.

The Psychology Behind It: Inversion

How to achieve this? Munger pioneered the mental model that has come to be known as “inversion.” “Instead of looking for success, make a list of how to fail instead,” Munger remarked. For stocks, this means identifying the risks and red flags of a company, and thinking through worst-case scenarios. What can go wrong—and is it insurmountable? In this way, minimizing potential losses should be the core focus of investors.

This model, however, derives its name from how it overturns the way human beings usually process information and make judgments. Our brains are wired for storytelling, making us vulnerable to narratives about revolutionary companies and susceptible to hype and fear of missing out. This natural human tendency can lead investors to chase high prices, ignore fundamentals, tap into leverage, and get in way over their heads—exposing them to increased risk of catastrophic loss.

Invest in What You Know

At the same time, you need to develop the knowledge and competence to make good evaluations. Munger always advised to “invest in what you know,” meaning that you should avoid pouring money into companies, projects, or assets where you don’t really understand how the investment will ultimately pay off.

Surround yourself with experts and expand your “circle of competence.” “When a person with money meets a person with experience, the one with experience ends up with the money and the one with money leaves with experience,” as Buffett put it in a 2016 shareholder letter.

Be humble enough to know when you’ve reached the limits of your own knowledge or skill, and then tap into this circle.

Avoiding Mistakes in Action

Take the example of the dotcom bubble of the late 1990s. While many investors bought into hot internet stocks, Munger and Buffett publicly avoided jumping into tech companies whose value proposition and business models they did not understand. This allowed them to emerge unscathed from the 2001 crash.

The same discipline bore fruit again in 2008, as Berkshire avoided the toxic securities that decimated Bear Stearns and Lehman Brothers. While competitors chased yield in complex instruments they didn’t fully understand, Munger and Buffett stuck to simple businesses with durable competitive advantages.

Today, the same doctrine may yet again yield results: AI stock hype, crypto surges, and meme stocks continue to make headlines, driving prices in the market to high levels above fundamentals. If you don’t “get it,” according to Munger, you should probably sit some of these out.

How To Put This in Practice

To follow Munger’s rule is to avoid catastrophic losses from which it would be difficult or even impossible to recover. Some practical investor insights:

• Focus on the margin of safety. Be sure you have enough liquidity to weather short-term losses.
• Invest in what you understand. If you can’t explain in plain language the value proposition of a business or asset, stay away.
• Think in decades, not quarters. The power of compounding rewards long-term investors who can take advantage of occasional pullbacks to accumulate positions when they are “on sale.”
• Embrace boredom and discipline. Staying cautious and ignoring the hype can go against our natural tendencies. This means stick to the plan, even if it may seem a bit boring. If your portfolio feels exciting, perhaps you’re taking on more risk than you realize.