What it means
The phrase comes from basketball, where fans and players often say that a shooter who has scored several times is "hot" and should keep getting the ball. A well-known academic study of shooting records argued that the streaks were no more frequent than chance alone would predict.
Later researchers have argued that small real effects may exist in some settings, so the debate is not fully closed. In investing the same idea appears when people pour money into a fund because it beat the market three years in a row.
Fund companies know this and advertise recent winners prominently, because past performance attracts new money. Regulators in many countries require a warning that past performance does not predict future results.
The reason streaks are hard to interpret is that random processes produce them. If thousands of managers each have an even chance of beating the market in a year, some will beat it several years running by luck alone.
The people who see those streaks are tempted to find a skilful explanation when none is needed. There are cases where persistence can be real, such as a manager with a genuine edge in a narrow market or a salesperson with a strong relationship pipeline.
The hard part is separating skill from luck, which needs a long record, a clear process and enough independent results to test. Investors should ask how the results were produced, not just how high they were.
The opposite error is also worth knowing: the gambler's fallacy, which is the belief that a streak must reverse because it is "due". Both mistakes come from misreading randomness.
A sensible rule is to judge decisions by the quality of the process, the fees and the risk taken rather than by the last few outcomes.
In practice
Real-world examples.
Example
A retail investor sees that a fund returned 25%, 18% and 22% in three consecutive years and moves $50,000 into it. The following year the fund returns -6%, because the sector that drove its earlier gains cooled off. The investor bought after the streak, not before it.
Example
A sales director gives the best territory to a salesperson who closed five large deals in a quarter. Two of those deals came from a single customer's one-off purchase, and the next quarter's results fall back to average. The streak reflected luck and timing more than a lasting advantage.
Example
A basketball team runs its offence through a player who has made six shots in a row. The coach weighs this against the player's season average and the opposing defence before deciding how much to rely on the streak.
Formula
Calculation
Probability of n wins in a row by chance = (Probability of one win) to the power n
Suppose each fund manager has a 50% chance of beating the market in any year, and results in different years are independent. The chance of beating it five years running by luck alone is 0.5 x 0.5 x 0.5 x 0.5 x 0.5 = 0.03125, or 3.125%. Among 1,000 managers, the expected number with a five-year winning streak is 1,000 x 0.03125 = 31.25, so about 31 managers would look brilliant purely through chance.Case study
Seen in the real world.
Brightwater Advisers is an illustrative, fictional firm that offers a monthly newsletter ranking the top-performing funds of the last 12 months. After a record year for one small-company fund, the newsletter featured it on the cover, and clients moved $4,000,000 into it within a month.
The fund then lagged its benchmark (the index used as a yardstick) for the next two years. When the firm's compliance officer reviewed the numbers, she found the fund's earlier gains came from a single concentrated position that had risen sharply, not from repeatable skill.
In this illustrative story the firm changed its approach. It now ranks funds on five-year records, fees and the consistency of the process, and it states clearly that past performance does not guarantee future results. The lesson is that a streak is a reason to investigate, not a reason to buy.
Watch out
Common mistakes.
- Buying a fund or stock only because it has risen for several periods in a row.
- Treating a short run of successes as proof of skill, without asking how many other people were trying and failed.
- Swinging to the opposite error and assuming a streak must reverse, which is the gambler's fallacy.
Questions
People also ask.
Is the hot hand real?
The evidence is mixed: early studies found little, and later work suggests small effects in some settings, so it should not be relied on in investing.
Why do fund companies advertise recent winners?
Because investors respond to past returns, and a strong recent record is the easiest way to attract new money.
How can an investor avoid hot hand thinking?
Judge a manager over a long period, compare returns with a suitable benchmark and look at fees, risk and the repeatable process behind the results.
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