Investors Are Doing Something We've Never Seen Before. Here's Warren Buffett's Best Advice for the Situation.

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The stock market has been on an incredible run since the S&P 500 (SNPINDEX: ^GSPC) hit the bottom of the prior bear market in Oct. 2022. Since then, the index has increased about 70% as of this writing. Many stocks have seen even greater returns in that 26-month period.

Most people think those returns are just the start of a strong bull market. In fact, 56.4% of consumers expect stock prices to increase over the next year, according to the most recent U.S. Consumer Confidence report from The Conference Board. While that might not sound like an overwhelming share of the population, it's a record high number since the survey started gathering this data 37 years ago.

Stock values are influenced by two major factors -- financial results and investor sentiment -- and many companies driving the bull market have produced incredible financial results over the last two years. But smart investors can't ignore that more people are optimistic about the future returns of the stock market than ever, which has driven prices higher.

Warren Buffett has some apt advice for the situation.

A close up of Warren Buffett.
Image source: The Motley Fool.

Applying the same advice to three different markets

In Oct. 2008, the S&P 500 had already fallen 40% from its 2007 peak, and many investors thought things could only get worse. In an op-ed for The New York Times, Buffett wrote, "Fear is now widespread, gripping even seasoned investors." Indeed, U.S. consumers had never been more pessimistic about the future of the stock market, according to The Conference Board's survey.

Buffett was compelled to remind readers of the simple rule he laid out in Berkshire Hathaway's (NYSE: BRK.A) (NYSE: BRK.B) 1986 letter to shareholders. "We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful."

When Buffett wrote those words in 1987 (to recap Berkshire's 1986 financial results), he noted, "Little fear is visible in Wall Street." At the time, investors had bid up stock prices, and as a result, he couldn't find any suitable equity investments for Berkshire's portfolio. Instead, he piled about $700 million of Berkshire's cash into Treasury bonds.

He wasn't particularly thrilled about it, either. "At best, the bonds are mediocre investments," he said. "They simply seemed the least objectionable alternative at the time."

In 2008, he applied the same exact idea to the market with opposite results. He moved his personal portfolio from 100% government bonds to 100% U.S. equities. It proved an extremely fortuitous move for the Oracle of Omaha. The S&P 500 hit its bottom a few months after Buffett published his op-ed and went on to produce incredible returns over the next 15 years.