MARKETS

What Is a Bear Market? Why Selling During One Usually Locks In the Loss

VC By Victor Cranson · August 14, 2026 · 3 min read

A bear market refers to a sustained period during which stock prices, or a broader market index, decline significantly, typically accompanied by widespread investor pessimism and negative sentiment. A commonly cited informal benchmark defines a bear market as a decline of 20% or more from a recent peak, sustained over a meaningful period, distinguishing it from a shorter, sharper “correction,” a term generally used for declines in the 10 to 20% range that don’t extend as long.

The imagery comes from how a bear attacks, swiping downward with its claws, in contrast to a bull’s upward thrust, giving the two terms their opposite visual associations.

Why bear markets are a normal, recurring part of investing

Historically, bear markets have occurred periodically across virtually every major stock market over long time horizons, triggered by recessions, financial crises, geopolitical shocks, or a broader reassessment of previously stretched valuations. They’re an uncomfortable but genuinely normal part of how markets function over time, not a sign that the entire system has fundamentally broken. Understanding this historical pattern, that meaningful declines have happened repeatedly and markets have historically recovered over subsequent years, is part of what allows long-term investors to stay invested through one rather than making panic-driven decisions.

The critical mistake: selling during a decline turns a paper loss into a real one

This is the single most important, and most commonly repeated, mistake investors make during a bear market. While your portfolio is declining in value but you haven’t sold, that loss exists only on paper, it’s unrealized, and it can recover if you remain invested and the market eventually rebounds, as markets historically have after previous downturns. The moment you sell during the decline, that paper loss becomes a real, locked-in loss, and you also give up any chance of participating in the eventual recovery with that specific money, since it’s no longer invested when the rebound happens.

Compounding this problem, investors who sell during a downturn often struggle to correctly time getting back in, frequently re-entering only after a significant portion of the recovery has already happened, having sold near the bottom and bought back in after prices had already risen meaningfully, a pattern that has cost many investors substantial long-term returns compared to simply staying invested throughout.

What a bear market can mean for a SIP investor

For someone investing regularly through a SIP, a bear market, uncomfortable as it feels, means each ongoing instalment is buying units at lower prices than before, which can meaningfully improve the average purchase cost over the full investment period, provided the SIP continues through the decline rather than being paused or stopped out of fear. This is one of the more counterintuitive but genuinely important aspects of long-term SIP investing: a market decline during the accumulation phase isn’t purely bad news for a disciplined, continuing investor, even though it doesn’t feel that way while it’s happening.

How long bear markets have historically lasted

There’s considerable variation, some bear markets have resolved within several months, while others have extended for a year or more, depending on the underlying cause and how quickly the triggering economic or financial conditions improved. There’s no reliable formula for predicting duration in advance, which reinforces why reacting to a bear market’s onset with a fixed prediction about when it will end, and investing decisions based on that prediction, is a genuinely risky approach.

Bottom Line

A bear market is a normal, recurring, if uncomfortable, feature of investing, and the single costliest mistake most investors make during one is selling out of fear, converting a temporary, unrealized decline into a permanent, realized loss. For long-term goals, continuing a disciplined investment approach, including ongoing SIP contributions, through a bear market has historically proven far more reliable than attempting to predict and time an exit and re-entry around it.

This article is for general information and isn’t personalized investment advice.