Descriptive Norms Cut Corruption—If People Believe Them

🧭 What Was Tested

Can norm-based information campaigns reduce corruption? This research unpacks how two message types—descriptive norms (how people typically behave) and injunctive norms (how people ought to behave)—affect corrupt behavior and attitudes.

🔬 How Evidence Was Gathered

Drawing on survey and lab experiments conducted in Ukraine, the design directly compares the distinct effects of descriptive versus injunctive norm messages on respondents' propensity to engage in or condone corruption.

📌 Key Findings

• Injunctive-norm messaging produces consistent but relatively small and temporary effects. Such messaging can serve as a moderately effective, low-cost anti-corruption tool but is unlikely to drive large-scale norm change.
• No evidence was found that either descriptive or injunctive norm messaging backfires by encouraging corruption, contrary to some recent studies.
• Descriptive-norm messages that emphasize a decline in corruption generate relatively large and long-lasting effects—but this impact appears only among recipients who find the message credible.
• Both descriptive and injunctive messages have substantially larger effects on younger citizens.

💡 Why It Matters

These results refine expectations for public-information campaigns aimed at social problems rooted in collective-action dilemmas. Messaging that highlights improving behavior can be powerful, but credibility and audience age shape effectiveness. Injunctive appeals offer modest, short-term gains at low cost, while descriptive appeals can produce larger durable change when recipients trust the information.