Bull Markets, Bear Markets, Everything In Between

The Precise Definitions Financial Media Blur Together

"The market is crashing." "We're in a bear market." "This is just a correction." These phrases get used almost interchangeably in headlines, but they describe genuinely different things, and the difference isn't pedantic — it changes what the sensible response actually is. A 12% dip and a 45% collapse are not the same event wearing different names, even though both can get described loosely as "the market falling."

A correction is a decline of 10–20% from a recent high. Corrections are common, routine, and arguably healthy — they happen roughly every one to two years on average and rarely signal anything structurally wrong with the economy. A bear market is a decline of 20% or more from a recent high, typically sustained over at least two months, and usually reflects (or anticipates) a genuine deterioration in economic conditions — a recession, a sharp rise in interest rates, a systemic financial shock. A bull market is the mirror image: a sustained rise of 20% or more from a recent low, and the "default state" of markets over long periods, given that economies tend to grow over time.

There's a fourth term worth separating out cleanly: a recession. A recession is an economic measurement — commonly, two consecutive quarters of falling GDP — not a market measurement. Markets and recessions are correlated but not identical: markets are forward-looking and often fall in anticipation of a recession before it's officially confirmed, and have a well-documented habit of starting to recover well before a recession officially ends, because markets price in the future, not the present.

What History Actually Shows

The S&P 500 has experienced roughly 27 bear markets and 27 bull markets since 1928 — by definition they alternate, since a bull market is partly defined as the recovery from a bear market and vice versa. The asymmetry between them is the single most important statistical fact in this entire topic.

Bull markets last roughly four to five times longer than bear markets and gain considerably more, in percentage terms, than bear markets lose. This asymmetry is exactly why staying invested through a full cycle — rather than trying to sidestep the bear markets specifically — has historically rewarded patience so consistently: an investor who remains invested captures years of compounding growth during each bull phase, and the much shorter, smaller bear phases, however uncomfortable in the moment, are a relatively brief interruption by comparison.

It's worth being honest that averages hide enormous variation. The shortest bear market on record, the 2020 COVID crash, lasted roughly 33 days from peak to trough — remarkably fast, both down and back up. The longest, the Great Depression-era bear market from 1929, saw the Dow fall nearly 89% over almost three years and took over two decades to fully recover in nominal terms. Most post-World War II bear markets have been far closer to the average: a decline in the 25–40% range, lasting under 18 months, recovering within one to three years. Treat the averages as a general shape, not a prediction of how any specific future bear market will behave.

What Actually Causes a Bear Market

Bear markets rarely have one single, clean cause — they're usually the product of several forces reinforcing each other. Four recurring drivers show up across most historical bear markets:

• Rising interest rates. Higher rates make future company earnings worth less in today's money (because future cash flows get discounted more heavily) and make borrowing more expensive for companies and consumers alike, which tends to slow growth and compress valuations simultaneously.
• Recessions or earnings deterioration. If company profits genuinely fall, share prices — which are ultimately a claim on future profits — tend to fall with them, sometimes before the recession is officially confirmed in the data.
• Financial system shocks. The 2008 financial crisis is the defining modern example: a breakdown in the banking and credit system that spread far beyond the institutions directly involved, freezing lending and confidence across the whole economy at once.
• External shocks. Pandemics, wars, oil shocks, and other events outside the normal economic cycle can trigger rapid, severe declines (2020's COVID crash being the clearest recent example) even when the underlying economy was otherwise in reasonable shape beforehand.

In hindsight, the trigger for any given bear market is usually identifiable and often feels obvious after the fact. In advance, it is notoriously difficult to predict — which is precisely why attempting to sell before a bear market starts, and buy back in before it ends, is such a difficult strategy to execute successfully and consistently, even for professional investors with every incentive and resource to try.

What to Actually Do During a Bear Market

"Stay the course" is the standard advice, and it's technically correct — but it's not very useful on its own when your portfolio is genuinely down 30% and every financial headline is reinforcing the fear. Here is more specific, actionable guidance, roughly in order of priority.

1. Do not sell your diversified long-term holdings. Selling after a decline converts a temporary, paper loss into a permanent, realised one. Every bear market in over a century of US market history has eventually been followed by a recovery to new highs — the question has always been "when," never "if," for a broad, diversified portfolio.
2. Keep your regular contributions going. If you invest monthly, continue. You are buying more units at a lower price during the decline — this is pound-cost averaging working in your favour, not against you, and the units bought during a bear market are statistically among the best-performing of your entire portfolio once the subsequent recovery and bull market arrive.
3. Check that your cash emergency fund is intact and genuinely in cash. A buffer of three to six months' essential expenses, held separately from your investments, means a job loss or unexpected bill during a downturn doesn't force you to sell investments at exactly the wrong moment to cover it.
4. Consider tax-loss harvesting in a taxable account, if applicable. Selling a loss-making position to offset gains elsewhere can produce a genuine tax benefit outside an ISA or pension, though UK wash-sale-style "bed and breakfasting" rules mean this needs care, and professional advice is worth seeking if the amounts involved are significant.
5. Reduce how often you check your portfolio. Watching a falling balance daily is psychologically corrosive and measurably associated with worse decisions — selling at the bottom, abandoning a sound plan out of short-term discomfort. If your time horizon is genuinely ten-plus years, a 30% fall this month has essentially no bearing on your eventual outcome.

Why Market Timing Is So Hard to Pull Off

Trying to avoid bear markets by selling before they happen and buying back once they're over sounds obviously sensible — avoid the pain, keep the gains. The problem is that it requires being right not once, but twice: correctly identifying the top before the decline begins, and then correctly identifying the bottom before the recovery takes off. Missing either call by even a short window typically destroys the benefit entirely.

The data on this is unusually clear-cut. A substantial share of a typical bull market's total gain is concentrated in a small number of the single best trading days, and those days overwhelmingly tend to cluster right around the most volatile, fearful periods — frequently within days of a market bottom, precisely when an investor who sold during the decline is least likely to have bought back in. Studies tracking the effect of missing just the ten or twenty best trading days over a multi-decade period consistently show it meaningfully reduces total returns compared to staying fully invested throughout — often by a dramatic margin relative to the modest "safety" gained by sidestepping the worst days.

Market Cycles: The Bigger Pattern

Bull and bear markets aren't isolated, random events — they form a recurring pattern often called a market cycle: a peak, a decline into a trough, a recovery back to a new peak, repeating indefinitely. A full cycle has historically taken somewhere between three and seven years peak-to-peak, though individual cycles vary considerably in length and severity.

Understanding that cycles are a structural, recurring feature of markets — not a sign that something has gone uniquely wrong this particular time — is arguably the single most useful piece of psychology for a long-term investor to internalise. Every investor who has ever lived through a full career of investing has lived through multiple bear markets. The ones who built meaningful long-term wealth, overwhelmingly, were not the ones who successfully predicted and avoided each one — they were the ones who understood that a decline was a normal, recurring phase of the cycle, not a unique crisis demanding an emergency exit.

This also explains why so much financial commentary during a downturn sounds apocalyptic in the moment and reads as overblown in hindsight: in the middle of a cycle, nobody knows exactly how deep the trough will be or how long it will last, so uncertainty gets filled with worst-case narratives. A few years later, once the cycle has completed, the same event is filed away as "the 2020 crash" or "the 2008 crisis" — a definable, bounded historical episode rather than an open-ended catastrophe.

How to Tell What's Actually Happening (Without Obsessing Over It)

You don't need to track daily percentage moves to know roughly where things stand. A few practical signposts:

• A decline of 5–10% from a recent high is a routine wobble — these happen several times most years and rarely warrant any response at all.
• A decline of 10–20%, sustained over more than a few days, is an official correction — still common, still not historically a reason to change a long-term strategy.
• A decline of 20% or more, sustained over roughly two months or longer, is an official bear market — the point at which it's worth checking your cash buffer and reaffirming (not abandoning) your plan, per the previous sections.
• A rise of 20% or more from a trough is an official bull market — note that this label gets applied in hindsight once the threshold is crossed, so you're often already well into a recovery by the time financial media confirms it with the label.

The genuinely useful habit is checking in on your portfolio and plan periodically — quarterly or twice a year is plenty for most long-term investors — rather than daily. Daily tracking makes every ordinary wobble feel significant and makes it far harder to tell a routine correction from the early stages of something larger, simply because you're too close to the day-to-day noise to see the shape of the underlying trend.

Common Mistakes

Treating a correction like a bear market. A 12–15% decline is well within normal annual variation. Reacting to it as though it's a crisis — pulling money out, pausing contributions — gives up the recovery of an entirely routine event.

Waiting for "certainty" before buying back in after selling during a decline. By the time a recovery feels obviously safe, a significant share of the gain has usually already happened. The feeling of safety tends to arrive well after the bottom, not at it.

Confusing a recession with a bear market, or assuming they move together. Markets are forward-looking and frequently start recovering before an official recession ends, because they're pricing in an improving future, not reflecting the still-weak present.

Checking the portfolio obsessively during a downturn. This amplifies the emotional discomfort without providing any useful new information, and is strongly associated with impulsive, poorly timed decisions.

Stopping regular contributions during a bear market "until things stabilise." This is precisely the period when the same monthly contribution buys the most shares for the price, historically producing some of the best-performing tranches of a long-term portfolio.

Recent Bear Markets, Briefly

Each of these had a distinct cause, a distinct shape, and a distinct recovery path — the 2020 crash resolved astonishingly fast, while the 2007–2009 crisis took years. This variety is exactly why trying to apply a single formula ("sell at X%, buy back at Y%") rarely works across different bear markets: no two have behaved quite the same way, and the one consistent feature across all of them is that each one eventually ended.

How Investor Behaviour Differs Between the Two Phases

Bull and bear markets don't just differ in price direction — they produce noticeably different, well-documented patterns of investor behaviour, and recognising these patterns in yourself is often more useful than any statistic about historical average duration or magnitude.

During extended bull markets, a recognisable sequence tends to play out: initial scepticism after the previous bear market gradually gives way to growing confidence, then to a sense that "this time the gains are justified and will keep going," and eventually, in the later stages, to the kind of broad, casual overconfidence where investing starts to feel effortless and risk feels like it's disappeared. This progression is sometimes informally described using a "market cycle psychology" chart that runs from disbelief through optimism, excitement, and eventually euphoria — and the historical pattern is that euphoria has, time and again, coincided with periods relatively close to a market top, precisely because that's when the broadest possible pool of buyers has already bought in, leaving fewer new buyers to push prices higher still.

During bear markets, the sequence tends to run in the opposite emotional direction: denial that a real decline is happening, then fear as losses become undeniable, then, in a sufficiently severe bear market, a kind of despondency where many investors conclude the decline will simply continue indefinitely — which, as covered in an earlier section on sentiment, has historically tended to coincide with periods relatively close to the eventual bottom. Recognising which part of this emotional cycle you're currently experiencing, as a personal gut check, is a genuinely useful discipline — not because it tells you exactly what the market will do next, but because it flags when your own decision-making is most likely to be distorted by the prevailing mood rather than by a clear-headed read of your actual long-term plan.

Secular vs Cyclical: The Bigger Pattern Within the Pattern

Beyond individual bull and bear markets, analysts sometimes talk about secular bull and bear markets — much longer multi-decade trends within which the shorter cyclical bulls and bears described earlier in this chapter all sit. A secular bull market is a long stretch, often 10–20 years, where the overall trend is strongly upward even though it still contains several cyclical bear markets along the way. A secular bear market is the opposite: a long stretch where the market struggles to make sustained new highs, even though it still contains cyclical bull-market rallies within it.

The period from roughly 1982 to 2000 is often cited as a secular bull market — nearly two decades of strong overall gains in US equities, despite containing the 1987 crash and several smaller corrections along the way. The period from roughly 2000 to 2013 is often described as a secular bear or sideways market — containing two separate cyclical bear markets (the dot-com crash and the 2008 financial crisis) and genuine cyclical recoveries in between, but with the overall index struggling to sustainably exceed its 2000 peak until well over a decade later.

This distinction matters mainly for setting realistic expectations: the standard "bull markets average 4.5 years, bear markets average 10 months" statistics describe the shorter, cyclical pattern. Within a secular bear phase, a cyclical bull market can still feel disappointing even while technically meeting the definition, because it's recovering ground within a longer, more difficult overall stretch rather than pushing to genuinely new, sustained highs.

Do Bear Markets Affect Bonds the Same Way?

Almost all the statistics in this chapter describe equity markets specifically. Bonds behave differently, and understanding the difference is part of why a mixed portfolio of shares and bonds tends to experience less severe overall drawdowns than an all-equity portfolio during an equity bear market.

Government bonds, in particular, have historically tended to do relatively well during equity bear markets driven by recession fears or a flight to safety — investors sell riskier assets and move toward the perceived safety of government debt, pushing bond prices up (and yields down) at exactly the point equities are falling. This isn't a universal rule, though: the 2022 decline was unusual precisely because both equities and bonds fell together, driven by rapidly rising interest rates, which hurt bond prices directly (existing bonds become less attractive once new bonds are issued at higher rates) at the same time as it hurt equity valuations. This "everything falls together" pattern is relatively rare historically but is a useful reminder that diversification between equities and bonds, while generally valuable, isn't an absolute guarantee against a decline in both simultaneously.

Sentiment Indicators: Why "Everyone Is Bearish" Can Be a Signal

A genuinely counter-intuitive pattern shows up repeatedly across market history: extreme, widespread pessimism among investors has often coincided with points relatively close to a market bottom, while extreme, widespread optimism has often coincided with points relatively close to a market top. This isn't a reliable, precise timing tool — it doesn't tell you the exact day — but it's a reasonably well-documented contrarian signal that professional investors pay attention to.

The logic behind it is straightforward once stated: by the time a decline has gone on long enough and far enough that even cautious, normally optimistic commentators have turned bearish, a large share of the selling that was going to happen has often already happened — there are fewer remaining sellers left to push prices down further. The reverse applies near market tops: when pessimism has become rare and confidence is widespread, a large share of the buying that was going to happen has often already happened too.

None of this means you should try to mechanically trade against prevailing sentiment — it's a background piece of context, not a trading system, and sentiment can stay extreme for longer than feels comfortable before a turn actually happens. Its main practical use for a long-term investor is psychological: recognising that your own gut feeling of "this is terrible, it's never going to recover" during a severe decline is a feeling shared by a very large number of other investors at that exact moment, historically, right around some of the best entry points in hindsight.