Recency Bias: Why You Think a Trend Will Last Forever
Recency bias makes investors assume what just happened will continue, leading to buying tops and selling bottoms. We explain the mechanism, cycle examples, and how to fight it.
The investor short memory
In a rising market, everyone thinks prices will rise forever. In a falling market, everyone believes "this time it goes to zero." That feeling comes from recency bias: the tendency to assume what just happened will continue, and to weigh recent events far too heavily against the long-term picture.
The mechanism
The brain prioritizes recent, vivid information. A rise or fall you just lived through is imprinted more strongly than data from five years ago. So we unconsciously extrapolate the present into the future:
- Just saw 6 months of gains, believe it will keep rising, so buy more at high prices.
- Just saw 3 months of losses, believe it will keep falling, so panic-sell at low prices.
Ironically, this is the recipe for buying high and selling low β the opposite of what is needed.
Examples through the cycle
Markets move in cycles, but recency bias makes us forget that:
- Late in a bull market, recency bias drives the crowd to believe "it goes up forever" so they FOMO into the top.
- At the bottom of a bear market, recency bias makes many capitulate right when they should buy.
Anyone led by recency bias is permanently out of phase with the cycle. It also makes investors chase the fund or stock that "just ran hot," forgetting that recent past performance does not guarantee the future.
How to fight it
- Look at long-term data: pull the chart out to 10 to 20 years instead of 3 months. The long view reminds you that both rises and falls end.
- Trust cycles, not momentum: remember every trend reverses; any extreme eventually reverts to the mean.
- DCA to avoid guessing: dollar-cost averaging buys evenly regardless of market mood, automatically reducing the impact of recency bias.
- Rebalance by rule: periodic portfolio rebalancing forces you to sell what just rose and buy what just fell β against the recency instinct.
- Favor time in market: time in the market beats trying to guess tops and bottoms from a recent trend.
A relative of other biases
Recency bias often travels with confirmation bias (seeking news that supports the recent trend) and herd mentality (the whole crowd extrapolating the present). The shared weapon is still a plan and automation.
Conclusion
Recency bias makes you believe a trend just seen will last forever, leading to buying tops and selling bottoms. Look at long-term data, trust the cyclical nature of markets, and use DCA and rule-based rebalancing to act against the "extrapolate the present" instinct. The recent past is not a map of the future.
Next step
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