Introduction to Behavioral Biases
In this lesson, we’ll explore common behavioral biases—mental shortcuts and emotional habits that can lead people to make poor financial decisions without even realizing it.
These biases affect everyone, from beginners to seasoned professionals.
You’ll learn what these biases are, how they appear in everyday investing situations, and most importantly, apply this awareness to make more thoughtful and confident financial choices in the future.
Overconfidence Bias
Overconfidence bias happens when people believe they are better at investing than they really are.
This can lead to taking unnecessary risks and trading too often, thinking they can outsmart the market.
Investors may feel overly sure about their predictions, even without solid evidence.
As a result, they may ignore warning signs, trade frequently, spend a lot on fees, and ultimately see worse performance than if they had taken a more cautious, disciplined approach.
Anchoring and Adjustment
Anchoring bias happens when people rely too heavily on the first piece of information they receive—called the “anchor”—even if it’s outdated or no longer relevant.
For example, if a stock once traded at $100, an investor might still believe it’s worth that amount, even if the company has weakened.
This bias makes it hard to adjust to new facts.
As a result, investors may misjudge the true value of an asset and make poor buying or selling decisions based on faulty reference points.
Representativeness and Pattern Recognition
Representativeness bias makes people assume that familiar patterns will repeat themselves.
For example, if a new tech company reminds an investor of a past success, they might expect the same outcome—without checking key facts like revenue, debt, or competition, where these companies might differ.
This leads investors to chase recent winners or follow hype, often ignoring warning signs.
Since markets are unpredictable, relying on surface similarities can result in poor timing, overpaying, or selling too early out of fear.
Jordan Evaluates Past Winners
Jordan, still at LumenX Energy, reviews mutual funds for his portfolio.
He picks the Stellar Growth Fund, which gained 28% last year—far above the 12% market average.
Assuming it will keep performing well, he ignores key facts: a 2% annual fee, some risky tech holdings, and a history of sharp drops in bad markets.
Jordan is falling into the representativeness trap—judging the fund by past returns instead of understanding its risks and long-term outlook.