Case file
Peltzman Effect
- Filed under
- Need To Act Fast
The charge
Safety rules or protective measures can lead people to behave less cautiously, reducing the net gain from the intervention.
How it operates
It is a policy-level version of risk compensation: protections change incentives and perceived downside.
Logged incidents
- Incident 01
Mandatory protections lead operators to run equipment faster.
- Incident 02
Generous fraud reimbursement makes some users less careful with account security.
- Incident 03
A project with strong budget backstops invites looser cost control.
What to watch for
Watch for analyses that count the direct safety benefit but ignore behavior change. Ask: 'How did incentives and risk-taking shift after protection was added?'
Recommended action
Evaluate full-system outcomes with causal designs such as difference-in-differences, not just the intended safety metric.
Known associates
- Overconfidence EffectPeople's confidence in their judgments often exceeds their actual accuracy, especially for predictions,…
- Social Desirability BiasPeople report attitudes or behaviors that make them look good to others instead of what is most accurate or…
- Third-Person EffectWe tend to believe persuasive messages, misinformation, or manipulation affect other people more than they…
- False Consensus EffectWe overestimate how much other people share our beliefs, preferences, and habits.
- Hard-Easy EffectOn hard tasks we are usually too confident, and on easy tasks we are often not confident enough.
- Lake Wobegon EffectMost people rate themselves as above average on desirable qualities, even when that cannot be true for…
Source of record