Bull Markets vs. Bear Markets: What Every Investor Should Know
Bull and bear markets aren't just moods — they're specific, measurable moves. Here's the actual definition, and what tends to separate the two.
Where the terms actually come from
A bull attacks by thrusting its horns upward; a bear swipes downward with its claws. That's the slightly folkloric origin of two of the most common phrases in investing, and the imagery has stuck because it's genuinely useful shorthand: a bull market describes a prolonged period of rising prices, and a bear market describes a prolonged period of falling prices.
The line most people use to define them
There's no single official rulebook, but the most widely used convention defines a bear market as a decline of 20% or more from a recent high, sustained over a meaningful period, across a broad index like the S&P 500. A bull market, by the same logic, is the recovery and advance that follows — typically measured from the bear market's low point.
A drop of 10% to 20% is usually just called a "correction" — common, often over within a few months, and generally considered a normal part of investing rather than a crisis.
How often they actually happen
Bear markets are a regular feature of investing, not a rare disaster. Looking back across decades of U.S. market history, declines of 20% or more from a peak have occurred repeatedly over time, though the spacing between them is irregular — sometimes two come close together, sometimes the better part of a decade passes without one. What's more consistent is the recovery: every prior bear market in the S&P 500's history has eventually been followed by a new high.
- Bear markets have historically tended to be shorter than bull markets, often lasting months rather than years.
- Bull markets have historically tended to last considerably longer and deliver larger cumulative gains than bear markets take away.
- Recoveries are often front-loaded — a large share of a bull market's total gain can happen in its first year.
Why trying to dodge them is harder than it sounds
The logical response to "bear markets happen" seems like it should be "sell before it happens, buy back after." In practice this is extraordinarily difficult to execute, because a market's best days and worst days tend to cluster together, often within the same turbulent stretch. An investor who is out of the market on just a handful of its strongest days — which frequently occur during or immediately after a downturn — can give up a significant share of their long-term return, even if they otherwise timed things reasonably well.
Missing only a handful of a market's best trading days over a multi-decade span has historically cut long-term returns dramatically, even though those days are a tiny fraction of the total time invested.
What this means in practice
For a long-term investor, the practical takeaway isn't to predict bear markets — it's to plan for the fact that they will happen, and decide in advance how you'll behave when one does. A portfolio built with a time horizon and risk tolerance that already accounts for a 20%-plus drop is far easier to sit through than one that assumed steady gains were the default.
This article is educational and general in nature. It isn’t personalized investment, tax, or legal advice — always weigh your own circumstances, or talk to a licensed professional, before making financial decisions.