Why Most Retail Investors Underperform the Market

Here is an uncomfortable truth about investing: the average retail investor consistently underperforms the very funds they invest in. Not because the funds perform badly — but because investors buy and sell them at the wrong times, in response to the wrong signals, for the wrong reasons.

This is not an opinion. It has been documented over many years by research organisations including DALBAR, which has analysed the gap between fund returns and investor returns in the United States for over three decades. The gap is persistent, it is significant, and it applies across most asset classes. Understanding why it happens — and how to counter it — is one of the most valuable things any investor can do.

The performance gap

DALBAR's research consistently shows that the average equity fund investor earns substantially less than the equity market index over the same period. The gap is often several percentage points per year. Compounded over decades, this can represent the difference between financial security and a shortfall in retirement.

The same pattern appears in bond markets, in property investment trusts, and in virtually every other asset class where retail investor behaviour has been studied. The funds themselves are not the problem. The investors are.

The primary reason is not fees, though fees matter. It is behaviour.

Buying high and selling low

The most damaging behavioural pattern is the simplest: investors put money in when markets are rising and pull money out when markets are falling. This is the opposite of rational investing, but it is entirely understandable. Rising markets generate positive headlines, feel comfortable, and attract new capital. Falling markets generate alarming headlines, feel painful, and trigger withdrawals.

The result is that the average investor buys near market peaks — after much of the gain has already been made — and sells near market troughs — just before the recovery begins. This pattern repeats across market cycles, reliably destroying value.

Overreacting to short-term signals

Financial news is relentless and almost entirely focused on the short term. Daily market movements, earnings announcements, central bank statements, geopolitical headlines — all are reported with an urgency that implies immediate action is required. In most cases, the rational response for a long-term investor is to do nothing.

Investors who trade in response to short-term news items are almost certainly reducing their returns. By the time a news event is in the public domain, professional traders — with faster information, better technology, and lower transaction costs — have almost certainly already priced it in.

Overconfidence

Studies in behavioural finance consistently find that investors overestimate their ability to pick investments, time the market, and assess risk. This is particularly pronounced among investors with some market experience, who may attribute past successes to skill rather than luck. Overconfidence leads to excessive trading, insufficient diversification, and concentration in assets the investor believes they understand particularly well.

Herding

Herding — following the investment choices of peers or the crowd — is a deeply human instinct. When a particular asset class, sector, or geographic market becomes a popular topic of conversation among family, friends, or in the media, it is often because its price has already risen significantly. Investors who pile in at this point are frequently buying at or near the peak.

Cryptocurrency in 2021, certain technology stocks at various points in the last decade, and buy-to-let property in parts of the UK during particular periods have all attracted waves of retail investors at or near peak valuations.

Recency bias

Recency bias is the tendency to extrapolate recent trends into the future. After a period of strong equity returns, investors assume equity returns will continue to be strong. After a sharp market decline, they assume further declines are likely. Neither assumption is well supported by historical evidence, but both feel intuitively compelling because the recent past is vivid and the distant past is abstract.

This bias causes investors to be systematically too optimistic near market peaks and too pessimistic near market troughs.

Home country bias

Internationally mobile investors might assume they are immune to this — but home country bias affects almost everyone. UK investors tend to overweight UK equities. US investors overweight US equities. Cypriot investors overweight Cypriot assets. This produces portfolios that are far less diversified than they appear, and that underperform more globally diversified alternatives in most long-run scenarios.

For expat investors, "home country" bias sometimes manifests as overweighting the country they grew up in, the country they currently live in, or both — producing a double concentration that is rarely warranted by the fundamentals.

The disposition effect

The disposition effect is the tendency to sell winners too early (locking in a gain feels good) and hold losers too long (realising a loss feels bad). The rational approach is often the reverse: let winners run (if the investment case remains intact) and cut losses (if the thesis has changed). Investors who systematically do the opposite drag down their returns over time.

How to counteract these tendencies

Systematic investing. Regular contributions invested at regular intervals — pound-cost averaging — remove the decision of when to invest. You buy more units when prices are low and fewer when prices are high, averaging down the effective purchase price over time. This is not a market-timing strategy; it is a strategy that removes the need for market timing.

Genuine diversification. A globally diversified portfolio — across asset classes, geographies, and currencies — reduces the impact of any single market or sector performing badly. It also reduces the temptation to make reactive decisions, because no single part of the portfolio ever dominates the whole.

A written investment policy. Defining your investment goals, time horizon, risk tolerance, and asset allocation in writing — before markets become volatile — creates an anchor that makes it easier to hold a strategy during difficult periods.

Minimise portfolio monitoring frequency. Investors who check their portfolio daily make more trades and earn lower returns than investors who check quarterly. This is consistent with the finding that the primary source of underperformance is overreaction to short-term information. Less is usually more.

Working with an independent adviser. The most consistent and well-evidenced benefit of working with an independent financial adviser is not superior investment selection. It is behavioural coaching — the steady hand that prevents clients from making expensive decisions during periods of market stress. An adviser who has helped clients through multiple market cycles brings a perspective that counteracts recency bias and prevents panic-driven decisions.

Research by Vanguard and others has attempted to quantify the value of this behavioural coaching function, attributing it to a meaningful uplift in investor returns over time compared to self-directed investors.

The international dimension

For internationally mobile investors, these challenges are compounded by additional layers of complexity: multiple currencies, multiple tax systems, different market dynamics in different jurisdictions, and greater information asymmetry about local markets. The risk of making behavioural errors is, if anything, higher than for domestic investors.

This makes the case for professional advice even stronger. Not because advisers have a crystal ball, but because the value of systematic, disciplined investment management — and someone to talk you out of a panic-driven decision — is well documented and difficult to replicate on your own.

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This article is for general information purposes only and does not constitute personal investment advice. The value of investments can fall as well as rise. Past performance is not a reliable guide to future returns. Global Investments recommends seeking independent financial advice tailored to your individual circumstances — contact us to speak with our team.