Apply extra scrutiny when a choice feels obviously good

Positive affect is as reliable a bias-trigger as fear — audit opportunities that feel like obvious wins.

Why it works

The affect heuristic operates symmetrically: just as fear suppresses benefit estimates, enthusiasm suppresses risk estimates. A business idea, relationship, or investment that generates strong positive affect will have its downsides systematically underweighted — the same filter that makes risks feel small also makes the benefits feel self-evident. Slowing down when the affect is strongly positive is a deliberate inversion: the stronger the positive feeling, the more scrutiny the risk side deserves.

How to do it

1. When a choice generates strong enthusiasm, explicitly flag it: “This feels like an obvious yes — that’s a reason to look harder at the downsides.”
2. Spend extra time on the “what could go wrong” list proportional to how good the upside feels.
3. Ask: "If I felt neutral about this choice, what would I say about its risks?"
4. Seek out someone who doesn’t share your enthusiasm to provide a risk assessment.

Evidence

Affect-heuristic research consistently shows that positive affect inflates perceived benefit and suppresses perceived risk, not just that negative affect does the reverse. Finucane et al. (2000) demonstrated this in multiple choice domains. The same study found the effect grew under time pressure, evidence that enthusiasm suppresses the risk side fastest exactly when a person is inclined to move quickly on an obvious-feeling win. (observational)

Enthusiasm is sometimes well-calibrated — not every positive feeling is a red flag. The practice is about proportionate scrutiny, not mandatory pessimism.

Sources

• Finucane, Alhakami, Slovic & Johnson (2000), The affect heuristic in judgments of risks and benefits, Journal of Behavioral Decision Making
• Finucane, M. L., Alhakami, A., Slovic, P., & Johnson, S. M. (2000). The affect heuristic in judgments of risks and benefits. Journal of Behavioral Decision Making, 13(1), 1–17.

Common mistake

Applying this practice to others’ decisions (“they’re too enthusiastic”) but not to your own — the affect heuristic is hardest to notice from the inside.