The illusion of evidence-based nudges
From a recent Journal of Political Economy paper by Stefano DellaVigna, Woojin Kim and Elizabeth Linos (2024): We study 30 US cities that ran 73 RCTs with a national nudge unit. Cities adopt a nudge treatment into their communications in 27% of the cases. We find that the strength of the evidence and key city features do not strongly predict adoption; instead, the largest predictor is whether the RCT was implemented using preexisting communication, as opposed to new communication. A nudge with a negative result is almost as likely to be implemented as a positive result. …[READ]
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