Bull and Bear Markets Explained: Definitions and Drivers

A bull market is a sustained period in which stock prices rise broadly, usually alongside improving confidence. A bear market is the opposite: a sustained, broad decline. Bull and bear markets are the shorthand investors use to describe the direction and mood of equity prices, and they frame most conversations about the stock market outlook. Neither label is a legal term, and no regulator assigns them, so the definitions below are conventions rather than rules.

In brief

• A bull market is a prolonged rise in prices; a bear market is a prolonged fall.
• A widely used convention treats a decline of about one-fifth or more from a recent peak as a bear market, and a similar rise from a low as a bull market. These are Wall Street conventions, not official definitions.
• A correction is a smaller decline, conventionally about one-tenth, and is not the same as a bear market.
• Drivers include earnings, interest rates, economic growth, liquidity and investor sentiment.
• Past patterns describe what has happened. They do not predict when a phase will begin or end.

Where the terms come from

The words are old market slang. The common explanation is that a bull thrusts its horns upward and a bear swipes its paws downward, though the exact origin is debated. What matters is the usage. When commentators say the market is “in a bull market,” they mean that a major index, most often the S&P 500, has been climbing for an extended time. When they say it has “entered a bear market,” they usually mean that the index has fallen by a conventional threshold from its most recent high.

Because there is no official body that declares these phases, you will see different definitions in different outlets. Some use closing prices and some use intraday prices. Some apply the threshold to the S&P 500, the Dow Jones Industrial Average or the Nasdaq Composite, and the three do not always agree. A reader should always check which index, which price series and which threshold is in use.

The conventions in plain terms

Correction. A decline of roughly ten percent from a recent peak. Corrections are common during bull markets and often recover within months.

Bear market. A decline of roughly twenty percent or more from a peak. Some analysts also require that the decline last for a minimum period.

Bull market. A rise of roughly twenty percent or more from a trough. Some definitions also wait for a confirmation period to separate it from a short rally.

Rally. A temporary rise. Bear markets include rallies, sometimes large ones, which is why they can be hard to identify in real time.

Drawdown. The percentage fall from a peak to a subsequent low. Drawdown is a neutral term that avoids the label question.

Secular versus cyclical. Cyclical describes shorter swings that last months or a few years. Secular describes multi-year or multi-decade trends. A secular bull can contain cyclical bears.

What drives each phase

No single cause explains bull and bear markets, and the interplay changes with each cycle. Common factors include:

• Corporate earnings. Stock prices reflect expectations about the profits companies will make. Rising profits and upward revisions tend to support rising prices; falling profits tend to do the opposite.
• Interest rates and monetary policy. The Federal Reserve sets the federal funds rate target and influences financial conditions through its policy decisions. Lower rates reduce the return on alternatives such as bonds and lower the rate at which future earnings are discounted, which has historically supported valuations. Higher rates have the opposite effect. The Fed explains its framework on federalreserve.gov.
• Economic growth and recessions. Many, though not all, bear markets overlap with recessions. The National Bureau of Economic Research, a private research group, dates US recessions, and its dating is separate from stock-market labels.
• Valuations. When prices rise much faster than earnings, a market becomes more sensitive to disappointment. Valuation alone does not time a turn, though.
• Liquidity and credit conditions. Easy credit and abundant cash can lift prices. Tight credit can force selling.
• Sentiment and positioning. Optimism can feed on itself in the late stage of a bull market, and fear can feed on itself during a sell-off.
• External shocks. Geopolitical events, pandemics, financial crises or sudden policy changes can start a decline or alter its course.

Phases of a typical cycle

Analysts often describe four stages, with the caveat that real markets do not follow a script.

1. Accumulation. After a decline, prices stabilize and the most informed or contrarian buyers return while sentiment is still poor.
2. Markup. Earnings improve, prices rise and a wider range of participants joins.
3. Distribution. Prices plateau or rise unevenly. Enthusiasm is high, and early buyers reduce positions.
4. Markdown. Prices fall, sentiment sours and selling accelerates until valuations or conditions attract buyers again.

This pattern is a teaching framework. It is clear in hindsight and difficult to apply in the moment, because each phase can last far longer or shorter than expected.

A worked example of the arithmetic

Percentages in bear markets are asymmetric, which surprises many investors. Take a hypothetical index at 1,000 points.

• A fall of 20 percent takes it to 800.
• To get back to 1,000 from 800, it must rise by 25 percent, since 200 is a quarter of 800.
• A fall of 50 percent takes it to 500, and a gain of 100 percent is needed to recover.

The figures are illustrative, not a forecast. The arithmetic explains why large drawdowns weigh heavily on long-term results and why recovery time is a standard measure of how painful a bear market was.

How regulators and exchanges treat sharp declines

Exchanges and the Securities and Exchange Commission (SEC) maintain rules designed to keep trading orderly during severe stress. Market-wide circuit breakers, for example, pause trading across US stock exchanges if the S&P 500 falls by specified percentages in a single day. The thresholds and the length of the pauses are set in exchange rules approved by the SEC, and the SEC’s Investor.gov glossary explains them. Individual stocks also have limit up-limit down bands that restrict extreme price swings. These tools slow trading but do not stop a bear market and do not guarantee prices.

Common misconceptions

“A bear market means a recession.” The two often coincide, but not always. Equity markets can fall without a recession, and a recession can occur while stocks hold up, because prices look ahead.

“Bear markets last for years, bull markets for decades.” Durations vary widely. Some declines are short and sharp; some last longer. Nobody can say in advance.

“You can tell when the bottom has arrived.” The bottom is clear only in hindsight. Rallies inside bear markets are common.

“The market moves as one.” Sectors, sizes and styles often diverge. A bull market in one group of stocks can coincide with a decline in another.

“Selling before a bear market and buying after is simple.” It requires two correct timing decisions in a row. The SEC’s Investor.gov site stresses diversification and a long-term plan rather than market timing.

How investors commonly think about the cycle

Without recommending any course, it is useful to know what investment education bodies discuss. Investor.gov emphasizes that all investing carries risk, including the loss of principal, and that time horizon and risk tolerance should guide an allocation. Diversification across asset classes, periodic rebalancing, and regular contributions are common themes. Investors with long horizons often treat declines differently than those who need money soon. This guide is educational and does not constitute advice about any security or strategy.

Reading market commentary critically

When a headline announces a bull or bear market, ask:

• Which index and which price series are used?
• What is the starting date for the peak or trough?
• Is the claim based on closing or intraday values?
• Does the comparison include dividends, as total return does, or only price?
• Is the article describing a milestone or predicting a direction?

These checks take a minute and prevent most confusion.

FAQ

What is the official definition of a bear market?

There isn’t one. A decline of about twenty percent from a recent high is the common convention, but no regulator or exchange sets it.

How is a bear market different from a correction?

A correction is a smaller decline, commonly around ten percent. A correction can end quickly, can deepen into a bear market, or can be followed by a new high.

Do bull markets always follow bear markets?

Historically, US stock indexes have recovered from declines, but the timing has varied widely, and past performance does not guarantee future results.

Can individual stocks be in a bull or bear market?

The terms apply to any asset or group of assets, including sectors, bonds, currencies and commodities. Commentators often use them loosely.

What does the Federal Reserve have to do with it?

The Fed influences interest rates and financial conditions, which affect valuations and credit. It does not target stock prices.

Where can I learn more from official sources?

Investor.gov, run by the SEC’s Office of Investor Education and Advocacy, publishes plain-language material on market risk, diversification and investing basics. The Federal Reserve site covers monetary policy.