Bull and bear markets, explained

Spend five minutes reading about the stock market and you will trip over two animals. The market is “bullish”. Investors have “turned bearish”. There is talk of a raging bull or a brutal bear. It sounds like a wildlife documentary, and for something so widely used, almost nobody stops to explain what the words actually mean.

The good news is that this is one of the friendliest ideas in investing. There is no maths and no jargon underneath it — just two simple moods, up and down, dressed up in animal costumes. Once you have them straight, a huge amount of market commentary suddenly makes sense.

The two words, in plain English

A bull market is a stretch of time when prices are generally rising and people feel optimistic. Confidence is high, more people want to buy than sell, and the overall direction is up. A bear market is the opposite: a stretch when prices are generally falling and the mood turns gloomy. Fear creeps in, more people want to sell than buy, and the direction is down.

The key word in both is stretch. A single good day is not a bull market and one scary afternoon is not a bear market. These terms describe the weather over weeks and months, not the temperature at lunchtime. Markets wobble up and down constantly — that is just the daily noise you can read about in how to read a share price without panicking. A bull or bear market is the bigger season those daily wobbles are happening inside.

Where the animal names come from

Nobody can prove the origin for certain, but the most-loved explanation is about how each animal fights. A bull attacks by thrusting its horns upward — a perfect picture of a rising market. A bear swipes its paws downward — a neat match for a falling one. Up-horns, down-paws. It is almost certainly a story invented after the fact, but it is so tidy that it has become the way everyone remembers which is which.

There is a second, older tale about bearskin traders who sold skins they did not yet own, betting the price would drop before they had to buy them — “selling the bear”. Whichever version you prefer, the useful part is simple: bull equals up, bear equals down. If you only take one thing from this article, take that.

How big does a move have to be?

Professionals like a rough rule so they are all talking about the same thing. The common one is the 20 per cent mark:

• When a market rises around 20 per cent or more from a recent low and keeps climbing, people start calling it a bull market.
• When a market falls around 20 per cent or more from a recent high and stays down, that is the usual threshold for a bear market.
• A smaller dip of roughly 10 per cent has its own name — a correction. It is a stumble, not a full change of season.

These numbers are guidelines, not laws written in stone. No bell rings the moment a market crosses the line, and commentators often argue about exactly when one season ended and another began. But the 20 per cent figure gives you a sensible sense of scale: a bear market is a serious, sustained fall, not an ordinary bad week.

Why markets swing between the two

Markets move between bull and bear seasons for the same reasons individual shares move — just scaled up to everyone at once. When the economy is growing, people have jobs, companies make healthy profits and investors feel confident about the future, buying tends to win and prices drift upward: a bull market. When something rattles that confidence — a recession, rising interest rates, a global shock — fear spreads, selling takes over and prices fall: a bear market.

A big part of it is simply how people feel. Markets are made of millions of human decisions, and confidence is contagious. Optimism encourages buying, which pushes prices up, which encourages more optimism. Fear works exactly the same way in reverse. That feedback loop is why moods can build up a real head of steam in either direction — and it is closely tied to how the news actually moves a share price, because a single headline can be the spark that tips the mood.

The trap: chasing the mood

Here is where beginners get caught. In a roaring bull market, when everything is going up and it feels like easy money, the temptation is to pile in at the top just before the mood turns. In a bear market, when every day is red and it feels frightening, the temptation is to sell everything at the bottom — locking in a loss right before the recovery.

Buying high on excitement and selling low on fear is one of the most common ways real investors lose money, and it happens because they are reacting to emotion instead of thinking. Understanding bull and bear markets is not about predicting them — almost nobody can reliably do that. It is about recognising the mood you are in so it does not quietly make your decisions for you. That is exactly the calm, patient mindset behind why holding beats trading for most beginners.

What this means inside the Challenge

During the Student Investor Challenge you will almost certainly live through spells that feel bullish and spells that feel bearish, even over a few short weeks. Knowing the difference changes how you read your own results. A few habits help:

1. Judge yourself against the market, not against zero. Losing less than everyone else in a falling market is genuinely a good performance, even when your total is red.
2. Do not panic-sell on a bad day. One gloomy afternoon is noise, not a bear market. Rushed selling into fear is how competitors throw away good positions.
3. Do not get greedy at the top. When everything is soaring and it feels effortless, that is exactly when to stay disciplined rather than betting the whole portfolio on the mood lasting forever.
4. Watch the whole scoreboard. A market-wide move usually shows up across the stock market index, which tells you whether your day was really about your picks or just the tide moving every boat.

Bull and bear are not predictions and they are not something to fear. They are just names for the two moods the market swings between, over and over, forever. Spot which one you are in, keep your head while others lose theirs, and you have learned something that plenty of grown-up investors still struggle with.

FAQ

What counts as a bear market?

The common rule of thumb is a fall of 20 per cent or more from a recent high, held for a sustained stretch rather than a single bad afternoon. A milder drop of around 10 per cent is usually called a correction instead.

Why are they called bull and bear markets?

The best-loved explanation is how each animal attacks — a bull thrusts its horns upward, like a rising market, while a bear swipes its paws downward, like a falling one. It is old market slang that simply stuck.

How long does a bull or bear market last?

There is no fixed length. Historically bull markets have tended to run longer than bear markets, but every cycle is different and nobody can reliably predict when one will turn into the other.

What should a beginner do in a bear market?

Usually the honest answer is stay calm and avoid panic-selling. Falling markets tempt people into rushed decisions, and reacting to every dip tends to do more harm than good over a whole competition.