Recency Bias
The tendency to give disproportionate weight to recent information when making judgments — even when older but equally valid evidence should count just as much.
Recency bias has two roots. The first is memorial: Bennet Murdock's 1962 Journal of Experimental Psychology paper documented the serial-position curve, showing that items at the end of a list are recalled more easily than items in the middle — a recency effect built into how short-term memory unloads. The second is judgmental: when we evaluate trends, performance, or risk, the most recent observations dominate the impression even when older data points are equally informative. In investing, recency bias produces chase behaviour — buying assets after a run of strong returns and selling after a run of weak ones, which is a textbook formula for buying high and selling low. In hiring, the last interview leaves a sharper imprint than the first. In sports and forecasting, "they're hot right now" replaces the longer track record. The fix is dull but works: stretch the evaluation window deliberately, weight observations equally, and beware of any conclusion that rests entirely on the last few data points.
Frequently Asked Questions
How is recency bias different from the availability heuristic?
They overlap. Availability says we judge by what comes to mind easily; recency is one of the reasons things come to mind easily — recent events are more accessible than older ones. Recency bias is best thought of as a specific time-weighted version of the broader availability heuristic.
Where does recency bias hurt the most in everyday decisions?
Anywhere a long track record matters but recent events are loud — investing, performance reviews, parenting judgments after a bad week, dating after a bad date. The corrective is to deliberately sample the older data: pull the year-long view, look at the average rather than the latest data point, and test whether the recent signal would have changed your mind a quarter ago.
Where was the recency effect first documented?
Murdock's 1962 paper "The serial position effect of free recall" in the Journal of Experimental Psychology established the U-shaped recall curve — strong memory for the first few items (primacy) and the last few items (recency), with weak memory in the middle. The judgmental form of recency bias was elaborated by later researchers including Tulving and Hogarth.