Carbon Pricing, Behavioral Nudges, and Network Effects in Carpooling: A Micro-founded Framework

Moustapha Mounmemi (), Vincent Bertrand () and Philippe Canalda ()
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Moustapha Mounmemi: Université Marie et Louis Pasteur, CRESE UR3190, Chaire REEL.i, Réseau EDEN.i, F-25000 Besançon, France
Vincent Bertrand: Université Marie et Louis Pasteur, CRESE UR3190, Chaire REEL.i, Réseau EDEN.i, F-25000 Besançon, France
Philippe Canalda: Université Marie et Louis Pasteur, FEMTO-ST UMR6174, F-25000 Besançon, France

No 2026-02, Working Papers from CRESE

Abstract: Decarbonizing transport requires scalable alternatives to private vehicles, yet carpooling adoption remains limited due to coordination failures and weak network density. This paper develops a micro-founded framework of multimodal carpooling adoption under carbon pricing, behavioral nudges, and endogenous network effects. Agents choose between private transport and platform-based carpooling based on generalized costs and a participation-dependent matching probability. This generates nonlinear adoption dynamics, multiple equilibria, and tipping points driven by network externalities and matching efficiency. The model is calibrated using French mobility evidence and simulation-based methods. Results show that carbon pricing increases adoption but is constrained by coordination thresholds. Behavioral nudges significantly reduce these thresholds and amplify pricing effects. Platform efficiency critically determines whether the system converges to high or low adoption equilibria. Mu-CAR digital platform, currently under deployment, will provide future high-frequency mobility data enabling structural estimation and empirical validation. Overall, the framework highlights strong policy complementarities and network effects.

Keywords: Carbon Pricing; Behavioral Nudges; Network Effects; Carpooling; Matching friction; Micro-founded Framework. (search for similar items in EconPapers)
Pages: 40 pages
Date: 2026-06
New Economics Papers: this item is included in nep-nud
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