Common money biases: loss aversion, herd behaviour and recency
What you'll learn
Recognise the three biases that most often push ordinary investors into selling low and buying high.
Three biases quietly cost ordinary investors more than any fund fee: loss aversion, herd behaviour and recency bias. Knowing their names is the first step to spotting them in yourself.
The three traps
| Bias | What it makes you do | The danger |
|---|---|---|
| Loss aversion | Hate losses more than you love gains | Sell good holdings early, cling to bad ones |
| Herd behaviour | Copy the crowd | Buy what is already expensive and popular |
| Recency bias | Assume the recent past continues | Buy high after good years, sell low after a crash |
Loss aversion
A loss tends to feel about twice as painful as an equal gain feels pleasant. That imbalance is why a falling market can trigger panic selling at exactly the wrong moment.
Herd behaviour
When everyone is talking about an investment, it feels safe. But popularity usually arrives after the price has risen. Following the herd often means joining late.
Recency bias
Our brains treat the last few years as the new normal. After a strong run we expect more, so we buy in. After a crash we expect more falling, so we bail out. Both push us toward buying high and selling low.
Why naming them helps
You cannot switch these instincts off - they are built in. But once you can name the feeling ("this is recency bias talking"), you can pause before acting on it. A simple written plan, agreed in calm times, is your best defence against a panicked decision later.
Key takeaways
- Loss aversion makes losses hurt about twice as much as gains please, driving badly timed selling.
- Herd behaviour tempts you into assets that are already expensive and crowded.
- Recency bias makes you assume the recent past will simply carry on.
- You cannot remove these biases, but naming them lets you pause before acting.
Illustrative only: the felt impact of a 10% loss versus a 10% gain, based on the well-documented finding that losses feel roughly twice as painful as equivalent gains feel good. This is a behavioural pattern, not a measurement of your portfolio, and is not a forecast.
Frequently asked questions
What is loss aversion?
It is the tendency to feel the pain of a loss far more strongly than the pleasure of an equal gain. It can push people to sell good investments early to avoid feeling a loss, or to cling to bad ones hoping to break even.
Is herd behaviour always wrong?
Not always, but following the crowd is risky when the crowd is chasing whatever has just gone up. By the time something is popular enough to feel safe, the easy gains have often already gone.
How does recency bias trick investors?
Recency bias makes us assume the recent past will continue. After a few good years we expect more, after a crash we expect more falling. Both can lead to buying high and selling low.
General information, not financial advice. The value of investments can fall as well as rise, and figures and rules can change; check the current position before acting.