How constant is constant elasticity of substitution? Endogenous substitution between clean and dirty energy

Ara Jo, Alena Miftakhova

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The degree of substitutability between clean and dirty energy plays a central role in leading economic analyses of optimal environmental policy. Despite the importance, assuming a constant and exogenous elasticity of substitution has been a dominant theoretical approach. We challenge this assumption by developing a dynamic general equilibrium model with an endogenous elasticity of substitution that interacts with the relative share of clean inputs in the economy. We find strong dynamic feedback effects arising from endogenous substitution capacity that amplifies the impact of directed technical change and accelerates the transition to a green economy.
Original languageEnglish
Article number102982
Number of pages21
JournalJournal of Environmental Economics and Management
Early online date16 Apr 2024
Publication statusE-pub ahead of print - 16 Apr 2024


  • Climate change
  • Directed technical change
  • Elasticity of substitution

ASJC Scopus subject areas

  • Economics and Econometrics
  • Management, Monitoring, Policy and Law

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