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The more the better? Synergies of prosocial interventions and effects on behavioural spillovers

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  • Alt, Marius
  • Bruns, Hendrik
  • Della Valle, Nives

Abstract

Incentivising prosocial and pro-environmental behaviours is a sensitive endeavour. While behavioural change is urgently needed to mitigate the consequences of climate change, monetary interventions often have negative side effects. Such interventions are prone to motivation crowding, which can impede lasting positive behavioural change and stimulate negative temporal spillovers to other prosocial behaviours. In this study, we investigate whether implementing monetary interventions as part of policy mixes can mitigate these negative side effects. In an online experiment involving 3782 participants, we test whether the use of nudges that make personal and social norms salient can counteract the motivation-crowding effect and explore the effects of such policy mixes on temporal spillovers. We find that policy mixes of norm-based nudges and monetary incentives are more effective at stimulating engagement in targeted prosocial behaviour than no intervention when controlling for sample characteristics. Analysing the temporal spillover effects of these interventions reveals that policy mixes can alleviate the tendency of monetary incentives to negatively affect subsequent prosocial behaviour. This indicates that norm-based nudges are suitable complements to monetary interventions, facilitating long-lasting positive effects.

Suggested Citation

  • Alt, Marius & Bruns, Hendrik & Della Valle, Nives, 2024. "The more the better? Synergies of prosocial interventions and effects on behavioural spillovers," Journal of Environmental Economics and Management, Elsevier, vol. 128(C).
  • Handle: RePEc:eee:jeeman:v:128:y:2024:i:c:s0095069624001359
    DOI: 10.1016/j.jeem.2024.103061
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    Keywords

    Prosocial behaviour; Pro-environmental behaviour; Behavioural interventions; Policy mixes; Behavioural spillovers; Online experiment;
    All these keywords.

    JEL classification:

    • D03 - Microeconomics - - General - - - Behavioral Microeconomics: Underlying Principles
    • D62 - Microeconomics - - Welfare Economics - - - Externalities
    • O13 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Agriculture; Natural Resources; Environment; Other Primary Products

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