Probability neglect
When an outcome stirs strong feeling, its odds stop mattering to us.
What it means
Probability neglect is the tendency, when an outcome carries strong emotion, to fixate on how bad or how wonderful that outcome would be while giving almost no weight to how likely it is. The mechanism is affective: vivid worst-case or best-case imagery captures attention and produces an emotional response of roughly fixed intensity, and because that feeling does not scale with the odds, the probability attached to it barely moves the decision. It surfaces in public reaction to terrorism, contamination, and product scares, in demand for insurance against dramatic but improbable losses, and in lottery play. Its scope condition is emotional intensity: for affect-poor outcomes such as small cash losses, people track probabilities tolerably well, and neglect emerges only once the outcome is dreadful or thrilling. It matters because regulators, insurers, and risk communicators face audiences whose alarm tracks imagery rather than expected harm, and reciting probabilities at them rarely helps.
Examples
Asked what they would pay to avoid an electric shock, people offer nearly the same sum whether the chance is 1% or 99%; for a cash loss, the odds matter.
A single recall over a trace contaminant clears supermarket shelves nationwide, because shoppers ask only whether the harm could happen to them, not what share of packages was ever affected.
Lottery advertising sells the jackpot scene — the oversized cheque, the beach, the resignation letter — and never the odds, because it is the imagined winning that people are actually pricing.
First described in Cass Sunstein (2002); Rottenstreich & Hsee (2001).