Market Cycles Explained: Halvings, Bull Markets and Bear Markets

Markets move in phases, not straight lines

A market cycle is the recurring pattern crypto prices, and Bitcoin's in particular, have historically traced over multi-year stretches: a sustained climb (a bull market), a sharp and often painful decline (a bear market), and long stretches of sideways stagnation in between. Zoom into any single week and price action can look random. Zoom out to years and the same rough shape tends to repeat.

That doesn't mean crypto runs on a fixed timer, and it doesn't mean the next cycle will look like the last one. But treating each cycle as a completely fresh, unprecedented event ignores a pattern that's shown up repeatedly enough to be worth understanding, if only so a 30% drawdown in a bear phase or a euphoric run in a bull phase doesn't feel like the first time it's ever happened.

Understanding cycles matters most as a check on your own emotions. New entrants tend to show up during the exciting part of the markup phase, assume the recent trajectory is the normal state of the market, and then panic when the cycle inevitably turns. Traders who've lived through a full cycle or two tend to expect the turn, even if they can't call the exact timing, and that expectation alone changes how they size positions and how much conviction they put behind any single trade.

The Bitcoin halving: a mechanism, not a theory

Unlike most of what gets discussed around market cycles, the halving isn't speculation. It's a hardcoded rule in Bitcoin's protocol. Roughly every four years, or more precisely every 210,000 blocks mined, the reward miners receive for successfully adding a new block to the Bitcoin blockchain gets cut in half. Fewer new bitcoins enter circulation per block after each halving than before it.

If you want the deeper mechanics of how mining and block rewards actually work, our guide to Proof of Work vs Proof of Stake covers what miners are doing and why the reward exists in the first place. What matters for cycle discussion is simpler: the halving schedule is public, verifiable on-chain, and known years in advance. Nobody can move it up or delay it. That predictability is exactly why it gets so much attention.

Do halvings actually cause bull runs?

Here's where the conversation gets a lot less certain, and worth being honest about. It's a widely discussed pattern that halvings have often come before major bull runs in the following 12 to 18 months. It's also a pattern built on a small handful of historical events, not the kind of sample size that supports a confident statistical claim.

Each halving has happened alongside very different macro conditions: different interest rate environments, different levels of institutional participation, different regulatory backdrops, and a market that's simply much larger and more mature than it was in earlier cycles. Correlation across three or four data points is suggestive at best. It is not proof that reduced supply issuance mechanically causes a price increase on a predictable schedule, and treating it that way is a common way traders talk themselves into positions they can't justify on anything but "it happened before."

There's also a reasonable economic argument underneath the pattern, separate from the historical coincidence: if demand for Bitcoin stays roughly constant or keeps growing while new supply entering the market gets cut in half, basic supply and demand suggests upward price pressure over time. That argument is logically sound. It just doesn't tell you the size of the effect, how quickly it shows up, or whether demand actually holds steady rather than shifting for reasons that have nothing to do with the halving at all.

The four-phase framing: accumulation, markup, distribution, markdown

Some analysts break a cycle down into four rough phases, borrowed loosely from classic market cycle theory. It's a useful mental model for thinking about where a market might be, not a precise or tradeable signal.

• Accumulation. Prices are flat or still drifting down after a bear market. Public interest is low and headlines have moved on. This is when informed, patient buyers are often said to be quietly building positions.
• Markup. The bull run. Prices rise, media coverage picks back up, and new buyers pile in as gains become harder to ignore. This is the phase most people associate with crypto being "back."
• Distribution. Prices are near a cycle high and momentum starts to stall. Earlier, informed holders are said to begin selling into the demand created by newer buyers who are chasing the excitement rather than the fundamentals.
• Markdown. The bear market. Prices decline, interest fades, and the cycle works its way back toward accumulation.

This framing is popular because it's intuitive, but it's descriptive after the fact far more often than it's predictive in the moment. Nobody rings a bell announcing the transition from markup to distribution. If you want a more grounded way to gauge where sentiment and money flow actually sit in real time, On-Chain Analysis 101 covers reading wallet activity and exchange flows directly instead of relying on a four-box mental model.

Altcoin season and Bitcoin dominance

A related pattern traders talk about is "altcoin season," the well-documented tendency for capital to rotate out of Bitcoin and into smaller altcoins at certain points in a cycle, usually once a bull run is established and traders start chasing bigger percentage gains further out on the risk curve.

One way analysts try to track this rotation is Bitcoin dominance, Bitcoin's share of total crypto market capitalization. When dominance is falling, it suggests money is flowing into altcoins relative to Bitcoin. When it's rising, Bitcoin is outperforming the rest of the market. It's a useful rough proxy, but it's a loose heuristic built on aggregate market cap data, not a precise timing tool, and dominance can shift for reasons that have nothing to do with a clean rotation story, like a handful of large-cap tokens moving sharply on their own news.

A grounded, skeptical close

Cycle analysis, the halving schedule, the four-phase framing, Bitcoin dominance, is a useful way to add context to where a market might be. It is not a trading system, and it's never behaved like one with any consistency. Traders who've treated historical cycle patterns as guarantees rather than tendencies have been burned badly when a given cycle simply didn't play out the way the prior ones did.

The honest way to use this framework is as one input among many: something that helps you avoid overreacting to a single bad week or a single euphoric month, not something that tells you what to buy or when. If a term in this guide didn't fully click, our crypto and trading glossary is a good place to look it up.