Letting Market Volatility Derail a Long-Term Plan

Investment Editorial Team Staff Writer · Aug 1, 2023 · 5 min read

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Why knee-jerk reactions to market downturns are one of the most damaging mistakes long-term investors make — and how to build the discipline to stay the course.

Key Takeaways

Emotional reactions to market dips often cause more financial damage than the dips themselves.
Selling during a downturn locks in losses that a recovering market would otherwise erase.
A written investment plan and automatic contributions help remove emotion from investing decisions.
Time in the market — not timing the market — is a core principle of long-term wealth building.
Diversification reduces the impact of any single asset's volatility on your overall portfolio.

Why Volatility Feels Like a Crisis (Even When It Isn't)

Markets go up, and markets go down — sometimes sharply and without obvious warning. For new investors, the first significant downturn can feel like a financial emergency. But the discomfort of watching your portfolio shrink is not, by itself, evidence that anything has gone wrong with your plan.

Volatility is a feature, not a flaw, of growth-oriented investing. Assets that deliver meaningful long-term returns do so precisely because they carry short-term risk. When you invest in the stock market, you are accepting that fluctuation in exchange for the potential of growth that outpaces inflation over many years.

The real danger is not the volatility itself — it is the decisions that volatility can provoke. Reacting emotionally to price drops is consistently cited by financial researchers and advisers as one of the most damaging behaviors long-term investors exhibit. If you are just beginning to build your portfolio, understanding this dynamic now can save you years of setbacks. See our step-by-step guide to building a long-term portfolio for a practical foundation before volatility tests your resolve.

Common Mistakes That Derail Long-Term Investors

The following mistakes are not signs of carelessness — they are predictable responses to a stressful situation. Recognizing them in advance is the first step to avoiding them.

Selling investments the moment the market drops sharply.

Why it happens: A falling portfolio triggers a loss-aversion response — losses feel roughly twice as painful as equivalent gains feel good, making panic selling feel rational in the moment.

How to avoid: Write down your investment rationale and time horizon before you invest. When volatility spikes, revisit that document rather than your brokerage account. Ask yourself: has my goal changed, or just the price?

Waiting on the sidelines for the market to 'calm down' before re-entering.

Why it happens: It feels safer to wait for certainty, but markets rarely announce a clear all-clear signal — by the time the news sounds positive, much of the recovery has already happened.

How to avoid: Use dollar-cost averaging (investing a fixed amount at regular intervals regardless of market conditions) to stay consistently invested and reduce the risk of buying at a single bad time.

Checking your portfolio daily and treating short-term noise as meaningful signals.

Why it happens: Investing apps make it effortless to watch prices tick by the minute, which amplifies emotional reactions to normal fluctuations that have no bearing on decade-long outcomes.

How to avoid: Set a deliberate review schedule — quarterly works well for most long-term investors. Turn off non-essential push notifications from brokerage apps to reduce reactive decision-making.

Abandoning a diversified strategy and concentrating into 'safe' assets after a loss.

Why it happens: After a painful drop, broad diversification can feel like it failed you. Retreating to a single 'safe' category (such as cash or gold) seems logical but replaces one form of risk with another.

How to avoid: Understand the role each asset class plays before you invest. A diversified mix is designed to reduce single-asset risk over time, not eliminate all short-term fluctuation.

Selling in a Downturn Locks In Real Losses

When you sell investments during a market decline, a paper loss becomes a permanent one. You also risk missing the recovery — historically, some of the market's strongest single-day gains have occurred within days of its worst. Missing just a handful of those rebound days can meaningfully reduce your long-term returns. Stay invested unless your financial situation or goals have fundamentally changed.

If the idea of riding out market swings still feels overwhelming, it may help to revisit some of the assumptions you carry into investing. Our article on wealth-building myths that trip up new investors addresses the widespread belief that timing the market is achievable — and why the evidence consistently argues otherwise.

Building a Volatility-Resistant Mindset and Strategy

Staying the course during turbulent markets is easier when your strategy is built to withstand emotional pressure from the start.

10 days

Biggest market gains missed by panic sellers

Research from J.P. Morgan Asset Management has repeatedly shown that missing the 10 best trading days in a 20-year period can cut portfolio returns roughly in half compared to staying fully invested.

~10%

Average annual US stock market return (long run)

The S&P 500 has delivered an average annual return of roughly 10% historically before inflation, though past performance does not guarantee future results and individual years vary dramatically.

Automate contributions. Setting up automatic, recurring investments removes the decision of whether to invest each month. When markets fall, automation keeps you buying — at lower prices — without requiring a deliberate act of willpower.

Match your portfolio to your actual time horizon. A 27-year-old saving for retirement has decades to recover from downturns. If short-term volatility is causing significant anxiety, it may signal a mismatch between your portfolio's risk level and your genuine comfort with risk — worth addressing through rebalancing rather than panic selling.

Diversify meaningfully. Spreading investments across asset classes, geographies, and sectors means no single market event devastates your entire portfolio. Diversification explained plainly can clarify how to structure this without overcomplicating your approach.

Don't Confuse Volatility With Permanent Loss

A portfolio dropping 15% in value is uncomfortable but not the same as losing that money permanently. Volatility is the normal price of investing in growth assets. Treating temporary price drops as catastrophic can push you into decisions — like moving entirely to cash — that cause lasting harm to your wealth-building trajectory. Always weigh short-term discomfort against your long-term goals before acting.

This article is for general informational and educational purposes only and does not constitute personalized investment, financial, or tax advice. All investing involves risk, including the possible loss of principal. Past market performance does not guarantee future results. Please consult a qualified financial adviser before making decisions about your own investments.

Investment Editorial Team

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Investment Editorial Team is the collective byline for our editorial team and contributor network. Articles published under this byline or an editorial pen name are researched, written, and reviewed according to our editorial standards for clarity, consistency, and independence before publication.

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