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Clean innovation, heterogeneous financing costs, and the optimal climate policy mix

Author

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  • Campiglio, Emanuele
  • Spiganti, Alessandro
  • Wiskich, Anthony

Abstract

Access to finance is a major barrier to clean innovation. We incorporate a financial sector in a directed technological change model, where research firms working on different technologies raise funding from financial intermediaries at potentially different costs. We show that, in addition to a rising carbon tax and a generous but short-lived clean research subsidy, optimal climate policies include a clean finance subsidy directly aimed at reducing the financing cost differential across technologies. The presence of an endogenous financing experience effect induces stronger mitigation efforts in the short-term to accelerate the convergence of heterogeneous financing costs. This is achieved primarily through a carbon price premium of 39% in 2025, relative to a case with no financing costs.

Suggested Citation

  • Campiglio, Emanuele & Spiganti, Alessandro & Wiskich, Anthony, 2024. "Clean innovation, heterogeneous financing costs, and the optimal climate policy mix," Journal of Environmental Economics and Management, Elsevier, vol. 128(C).
    • Handle: RePEc:eee:jeeman:v:128:y:2024:i:c:s0095069624001451
    DOI: 10.1016/j.jeem.2024.103071
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    Keywords

    Carbon tax; Endogenous growth; Innovation policy; Green financial policy; Low-carbon transition; Optimal climate policy; Sustainable finance;
    All these keywords.

    JEL classification:

    • H23 - Public Economics - - Taxation, Subsidies, and Revenue - - - Externalities; Redistributive Effects; Environmental Taxes and Subsidies
    • O31 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Innovation and Invention: Processes and Incentives
    • O44 - Economic Development, Innovation, Technological Change, and Growth - - Economic Growth and Aggregate Productivity - - - Environment and Growth
    • Q55 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Environmental Economics: Technological Innovation
    • Q58 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Environmental Economics: Government Policy
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation

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