Market Cycles: Bull and Bear Markets, Drawdowns and Staying Invested

Markets do not move in a straight line — they cycle between bull markets, where optimism and rising prices feed each other, and bear markets, where fear does the same in reverse. In 2026, the S&P 500 has cycled through three bear markets in a generation, and each one convinced a cohort of investors to sell. The math of cycles is unforgiving but simple: the recovery from a drawdown always requires more percentage gain than the drawdown you just suffered, and history says the investors who stayed invested through the pain captured almost all the returns.

Anatomy of a cycle: bull, peak, bear, trough

A bull market is typically defined as a 20%+ rise from a low; a bear market as a 20%+ fall from a high. Bulls last longer and climb more; bears are shorter and faster. Since 2000 the US market has lived through several complete cycles, each with its own trigger — speculation, credit, a pandemic, an inflation shock — and the same shape every time.

Drawdown math: what -40% really costs

The asymmetry of drawdowns is the first number every investor should memorize. A 20% loss needs 25% to recover; a 40% loss needs 67%; a 50% loss needs 100% — a full doubling just to get back to even. This is why bear markets punish the sellers: they convert a temporary price drop into a permanent capital loss at exactly the wrong time.

-20% → need +25% to break even
-33% → need +50%
-40% → need +67%
-50% → need +100%
Sell at -40% and buy back at the top: the missing 67% is paid in cash, not time

Staying invested: the cost of missing the best days

The classic study of US market history keeps arriving at the same conclusion: a handful of days produces most of the return. Over the 20 years to 2021, $10,000 in the S&P 500 grew to roughly $64,000 — but missing just the 10 best days left about $33,000, and missing the 30 best days left under $20,000. The best days cluster around market bottoms, exactly when fear tells you to be out. You cannot reliably skip the worst days without skipping the best ones, because they arrive in the same weeks.

The market's worst days and best days happen within days of each other. Being out for the panic means being out for the recovery.

Dollar-cost averaging, rebalancing and the cycle

Cycles are unforecastable in advance, which is exactly why mechanical rules beat predictions. Dollar-cost averaging buys more shares when prices are low and fewer when they are high, so a bear market quietly becomes a buying opportunity if your contributions continue. Rebalancing forces you to sell what went up and buy what went down — the contrarian discipline in a single rule. The lump sum vs DCA calculator quantifies the tradeoff, and the investment return calculator shows what an unchanged contribution schedule does across any cycle.

None of this means ignoring bear markets. They are when risk shows its true price: a 25% drawdown on a 100% stock portfolio is a $25,000 hole on $100,000, while the same portfolio at 60% stocks takes a $15,000 hit. Cycle planning is mostly asset allocation — sizing the downside you can hold through, because the only strategy that reliably loses in a cycle is the one that sells at the bottom. The CAGR article shows why the average return you see quoted is usually higher than the return you actually pocket through volatility.

The cycle's real lesson

Quick Answer

How bull and bear markets behave, what drawdowns really cost, and why staying invested wins. This guide explains the formula in plain English, walks a worked example with real numbers, shows the mistakes to avoid, and links the free calculator so you can run your own scenario in under a minute.