Key Takeaways:

  • A 16th-century proverb advises: “It’s unwise to sell a bear’s skin before catching it.”
  • It follows that a market in which securities or commodities are persistently declining in value is known as a “bear market,” like the one U.S. stocks are experiencing now.
  • But when there are big swings in the stock market, it’s hard for my students and others to resist using more emotive terms like “bulls” and “bears,” which call to mind the “animal spirits” of investing.
  • When it rises by 20% or more over two months or more, it is a bull market.
  • Not everyone strictly follows this two-month rule.
  • Some analysts estimate there have been 26 bear markets in the S&P 500 since 1928, excluding the one that began in 2022.

A 16th-century proverb advises: “It’s unwise to sell a bear’s skin before catching it.” 

That’s one of the stories used to explain why, in modern times, Wall Street types call someone who sells a stock expecting its price to drop a “bear.” It follows that a market in which securities or commodities are persistently declining in value is known as a “bear market,” like the one U.S. stocks are experiencing now

The opposite, when assets are steadily rising over a period of time, is a “bull market.”

In my money and banking classes, I teach students about the efficient market hypothesis, which states that stock prices are rational, in that they are always fairly priced based on available information. But when there are big swings in the stock market, it’s hard for my students and others to resist using more emotive terms like “bulls” and “bears,” which call to mind the “animal spirits” of investing. 

So how do you know when you’re in a bear market?

The Securities and Exchange Control Commission defines a bear market as a period of at least two months when a broad market – measured by an index such as the S&P 500 – falls by 20% or more. When it rises by 20% or more over two months or more, it is a bull market

The Standard & Poor’s 500 index, which includes most of the most well-known U.S. companies, has declined about 24% since its its peak on Jan. 3, 2022.

Not everyone strictly follows this two-month rule. For example, in March 2020, when the S&P 500 plunged 34% in a matter of weeks due to the onset of the COVID-19 pandemic, many analysts still called it a “bear market.”

A milder form of a bear market is “correction.” During a correction, prices drop by 10% to 20% from the previous peak. 

Some analysts estimate there have been 26 bear markets in the S&P 500 since 1928, excluding the one that began in 2022. The average length was 289 days, with a decline of about 36%. The longest was in 1973-74 and lasted 630 days.

There have been fewer distinct bull markets, with 24 in that period. They tend to last a lot longer, though, often for multiple years. 

Why a bear market matters

bear market may signal a recession is coming, though it’s not a perfect correlation. Since World War II, there have been three bear markets – out of a total of 12 – that didn’t precede a recession. 

A bear market is bad news for anyone with a stock investment, whether it’s a direct stake in Apple or Walmart or a 401(k). The impact is particularly hard on recent retirees, who are seeing their nest eggs shrink just as they need to start withdrawing income from them. 

In addition, entering a bear market can have a psychological impact on investors, creating a self-fulfilling cycle. Perceiving a bear market tends to prompt investors to sell even more, thus pushing prices down further and prolonging the pain.

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