How to Keep ‘Mr. Market’ from Controlling Your Investments

Buffett’s most important investment advice often involves a peculiar character investors need to understand: “Mr. Market is there to serve you, not to guide you. It is his pocketbook, not his wisdom, that you will find useful.”

“Mr. Market” is an invention of Buffett’s mentor, Benjamin Graham, who created him to explain stock market behavior. Graham, known as the father of value investing, taught Buffett at Columbia Business School and later hired him at his investment firm. His metaphorical “Mr. Market” represents the stock market’s daily mood swings—sometimes wildly optimistic, other times deeply pessimistic.

The key insight is that prices often reflect emotions more than business fundamentals, creating opportunities for disciplined investors to generate profits.

Who Is ‘Mr. Market’?

Mr. Market is a metaphorical character who offers to buy or sell shares at different prices every day based purely on emotion. Buffett explains that Mr. Market “has incurable emotional problems.” Sometimes, “he feels euphoric and can see only the favorable factors affecting the business. When in that mood, he names a very high buy-sell price because he fears that you will snap up his interest and rob him of imminent gains.”

At other times, Mr. Market gets “depressed and can see nothing but trouble ahead for both the business and the world. On these occasions he will name a very low price, since he is terrified that you will unload your interest on him.”

This metaphor captures well the emotional trading pattern of someone who simply follows the ups and downs of the market.

Buffett’s Core Advice

The key is understanding Mr. Market’s role in your investment strategy. Buffett writes that “the more manic depressive his behavior, the better for you.” Why? Because extreme mood swings create more pricing errors. When Mr. Market is euphoric, he’ll overpay for your shares. When he’s depressed, he’ll sell quality businesses at bargain prices. The wider his emotional swings, the more profit opportunities he hands you.

Buffett also notes that “declining prices for businesses benefit us, and rising prices hurt us.” He identifies the most common cause of low prices as pessimism, which is “sometimes pervasive, sometimes specific to a company or industry.” He wants to do business in such an environment, “not because we like pessimism but because we like the prices it produces.”

Practical Strategies for Investors

• Focus on business value, not daily prices: Graham’s fundamental insight was that “price is what you pay and value is what you get”—two things that are “rarely identical.” Buffett applies this by approaching stock purchases “as if we were buying into a private business. We look at the economic prospects of the business, the people in charge of running it, and the price we must pay.”
• Use market volatility to your advantage: Buffett writes that “the more manic depressive his behavior, the better for you” when referring to Mr. Market. While you don’t want to mindlessly “buy the dip,” when the market is pessimistic, you are more apt to find better values.
• Keep a long-term perspective: Buffett often quotes Graham, who said, “In the short run, the market is a voting machine but in the long run it is a weighing machine.” The market may temporarily overlook business success, but it should eventually confirm it.

Bottom Line

Instead of letting market emotions control your investment decisions, use them to your advantage. When others panic and sell quality businesses at discount prices, that’s your buying opportunity. When euphoria drives prices to irrational levels, consider taking profits.

The key is remembering that Mr. Market works for you—his job is to offer prices, not to tell you what to do. As long as you focus on the underlying value of the businesses you own rather than their daily price changes, you can profit from the crowd’s emotions instead of following them.