Market Volatility Explained: What Should Investors Do
Market volatility is a normal part of investing. Prices rise and fall as investors react to economic news, company results, political events and changes in confidence. These movements can feel unsettling, but they don't automatically mean a long-term financial plan has failed.
In our previous article, we looked at the hidden risks of DIY investing. This article explores what volatility means, why time and diversification matter, and how investors can avoid turning a temporary market fall into a lasting financial setback.
What Is Market Volatility
Market volatility describes how quickly and significantly investment prices move. A market that rises or falls sharply over a short period is experiencing high volatility. When prices move more steadily, volatility is lower.
Volatility is not the same as permanent loss. An investment may fall in value and later recover. A permanent loss can arise if the investment does not recover, or if an investor has to sell while its value is depressed. That distinction is important because your timeframe and need for access to the money can matter as much as the investment itself.
Chart 1: A long-term view of the Dow Jones Industrial Average shows substantial growth alongside repeated market falls. The image shows the index level rather than total investor returns. Source: Original chart source to be confirmed before publication
A long-term chart can make investing seem straightforward: accept the falls, stay invested, and wait. The reality is more complicated. No one knows in advance how far markets will fall, how long a recovery will take or whether the next decade will resemble the last one.
Unexpected Events Are Part of Investing
Markets have lived through wars, financial crises, political shocks, pandemics and periods of very high inflation. These events were different, and so were the scale and length of the market falls that followed.
Chart 2: Selected unexpected events and the associated S&P 500 sell-offs. This graphic was produced in March 2020 and is a historical snapshot, not a current account of the full COVID-19 recovery. Source: Visual Capitalist and New York Life Investments
The lesson is not that markets always recover quickly. It is that uncertainty is unavoidable. A sound plan should withstand difficult periods without depending on a precise forecast of what will happen next.
Why Your Investment Timeframe Matters
Over short periods, the range of possible investment outcomes can be wide. Historically, that range has narrowed as the holding period has increased. This helps explain why money needed soon should not usually rely on short-term stock-market performance.
Chart 3: The historical range of annualised US equity, bond and balanced portfolio returns over different rolling periods from 1950 to 31 August 2026. Source: J.P. Morgan Asset Management Guide to the Markets UK
The chart is historical and cannot predict future returns. It does, however, show why you should consider time before deciding how much investment risk to take.
If you expect to need money within the next few years, the priority may be to protect the amount required rather than pursue further growth. If the money is intended for a goal decades away, short-term fluctuations may matter less, provided the portfolio remains suitable for you.
Does Volatility Mean You Are Losing Money
A falling portfolio value is uncomfortable, but the effect depends on what you own and when you need the money. An investor with a diversified portfolio and a long timeframe may be able to wait. Someone drawing a regular retirement income may have less flexibility because selling investments after a fall can leave fewer assets available to benefit from a recovery.
Concentration increases this risk. A portfolio invested heavily in one company, country or investment theme can take much longer to recover and may never do so. Diversification cannot prevent losses, but it can reduce reliance on a single part of the market.
Chart 4: Annual returns for selected global equity markets show that leadership changes frequently. The hypothetical diversified portfolio provides a steadier middle path, although it does not lead in any individual year. Source: J.P. Morgan Asset Management Guide to the Markets UK
Diversification means accepting that part of your portfolio will nearly always appear disappointing compared with the current winner. That is not necessarily a fault. It is the price of avoiding the need to predict which market will perform best next.
Volatility Can Test Our Emotions
Investors do not experience markets as a chart. They experience them through headlines, account balances and the fear that the future may be different this time.
Chart 5: The emotional cycle of investing. Excitement can encourage people to buy after markets have risen, while fear can tempt them to sell after a fall. Source: Money Wise UK
This can create a damaging pattern: buying when confidence and prices are high, then selling when fear is greatest. The investment may not be the original problem. The problem may be the decision made in response to its short-term movement.
A financial plan provides a reference point during these periods. Instead of asking, “What will the market do next?”, the more useful questions are, “Has my goal changed?”, “Do I need this money sooner?” and “Is the portfolio still appropriate for me?”
Why Trying to Time the Market Is Difficult
Moving into cash before a fall sounds attractive, but it requires two successful decisions: when to sell and when to reinvest. Some of the market’s strongest days can occur close to its weakest days, when confidence remains fragile.
Chart 6: Illustration of the effect on FTSE 100 total returns since 1992 of missing the market’s five or 30 best-performing days. Period shown: 31 December 1992 to 27 February 2026. Source: Fidelity International using Refinitiv data
This is a deliberately severe illustration: an investor would have to miss the best days while remaining exposed to the weaker ones. It does not prove that staying invested is always correct. It shows the additional risk created by repeatedly moving in and out of the market in search of the perfect moment.
What Should You Do When Markets Are Volatile
The right response depends on your circumstances, but five questions can provide a useful starting point:
What is the money for, and when will you need it?
Do you have enough accessible cash for planned spending and unexpected costs?
Is your portfolio diversified across different investments and regions?
Has your financial position changed, or are you reacting mainly to the headlines?
Would selling now support your plan, or simply make a temporary fall permanent?
Regular investing may let you buy more units when prices are lower, but markets can keep falling and recovery times vary. Likewise, reducing investment risk can make sense as a goal approaches. Both decisions should follow the plan rather than trying to predict the next market move.
Bringing It Together the Castlebay Way
Volatility is part of the investment journey. It cannot be removed, and history cannot tell us exactly what will happen next. What we can control is the purpose of the money, the level of risk taken, the spread of investments and the decisions made when markets become uncomfortable.
At Castlebay Financial Management, we start with you. We take time to understand where you are today, what you want your money to achieve and when you may need it. We then build a financial plan and investment approach around your life—not around the latest market headline.
If market movements are causing concern, or you are unsure whether your investments remain appropriate, a conversation can help bring the plan back into focus.
Important information
This article is for general information only and does not constitute financial advice. Financial planning and investment decisions should be based on your individual circumstances. Tax rules and legislation can change, and their impact will depend on your personal situation. If you would like advice tailored to your circumstances, please speak to a qualified financial planner.
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Last reviewed: September 2026
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