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This summary is machine-generated.

Governments often test innovations using randomized controlled trials (RCTs). However, policy adoption of these tested nudges is mainly predicted by using existing communication channels, not evidence strength.

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Area of Science:

  • Public Policy
  • Behavioral Economics
  • Government Innovation

Background:

  • Governments increasingly utilize randomized controlled trials (RCTs) to evaluate policy innovations.
  • Understanding how policy-making incorporates evidence from these trials remains limited.

Purpose of the Study:

  • To investigate the factors influencing the adoption of evidence-based interventions tested via RCTs in U.S. cities.
  • To identify predictors of policy adoption following government-led RCTs.

Main Methods:

  • Analysis of 73 RCTs conducted across 30 U.S. cities in collaboration with a national Nudge Unit.
  • Statistical examination of adoption rates based on evidence strength, city characteristics, and implementation methods.

Main Results:

  • Nudge treatments were adopted into city communications in 27% of the evaluated RCTs.
  • Evidence strength and city features were weak predictors of adoption.
  • RCTs implemented using pre-existing communication channels showed significantly higher adoption rates compared to those using new communication.

Conclusions:

  • The adoption of tested policy innovations is primarily driven by implementation feasibility rather than the strength of scientific evidence.
  • Organizational inertia, favoring integration with existing infrastructure, significantly influences policy adoption decisions.
  • Future policy innovation should consider the role of existing communication systems for successful integration.