Soda tax design under imperfect competition

Helmuth Cremer, Catarina Goulão and Jean-Marie Lozachmeur
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Helmuth Cremer: TSE-R - Toulouse School of Economics - UT Capitole - Université Toulouse Capitole - Comue de Toulouse - Communauté d'universités et établissements de Toulouse - EHESS - École des hautes études en sciences sociales - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement
Catarina Goulão: TSE-R - Toulouse School of Economics - UT Capitole - Université Toulouse Capitole - Comue de Toulouse - Communauté d'universités et établissements de Toulouse - EHESS - École des hautes études en sciences sociales - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement, INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement
Jean-Marie Lozachmeur: TSE-R - Toulouse School of Economics - UT Capitole - Université Toulouse Capitole - Comue de Toulouse - Communauté d'universités et établissements de Toulouse - EHESS - École des hautes études en sciences sociales - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement, CNRS - Centre National de la Recherche Scientifique

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Abstract: Health damages of an unhealthy good, such as a sugar-sweetened beverage, are misperceived by consumers. Market power affects both output and sugar content and these effects have to be balanced against Pigouvian considerations. Under "pseudo" perfect competition, a Pigouvian tax proportional to sugar content is sufficient to achieve a first best solution. Under monopoly, a specific tax on output achieves an efficient solution, but it must be an affine function of the sugar content. The calibrations of the French and US markets illustrate that both the total tax as well as its sugar component can be positive or negative.

Keywords: sin tax; tax incidence; misperception; monopoly (search for similar items in EconPapers)
Date: 2026-01-30
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