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Corporate Green Bonds: Understanding the Greenium in a Two-Factor Structural Model

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  • Elettra Agliardi

    (University of Bologna)

  • Rossella Agliardi

    (University of Bologna)

Abstract

A novel structural model is developed to understand the determinants of green bond prices and the so-called ‘greenium’, that is, the premium that bondholders are willing to pay to invest in green securities rather than conventional ones. The presence of a greenium makes green bonds relatively cheap vehicles to fund environmentally sustainable projects and thus contributes to the shift to a green economy. Yet, evidence on the greenium is mixed and the determinants of green bond yields are not fully understood. In this model two sources of uncertainty are introduced, that is, of cash flows of the firm and of the effectiveness of the financed green projects. The adoption of two risk factors brings in some mathematical complexity but allows for a better modelling of the multi-facet nature of these financial instruments. Our model is rich enough to generate both a positive and a negative premium, as both have been detected in the empirical literature. Thus, we shed light on possible heterogeneity concerning the existence of a greenium in the green bond universe. Moreover, we show how green bonds affect the issuer’s creditworthiness, depending on the correlation of the green project with the core business of the firm and study their impact on investors’ portfolio allocation.

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  • Elettra Agliardi & Rossella Agliardi, 2021. "Corporate Green Bonds: Understanding the Greenium in a Two-Factor Structural Model," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 80(2), pages 257-278, October.
    • Handle: RePEc:kap:enreec:v:80:y:2021:i:2:d:10.1007_s10640-021-00585-7
    DOI: 10.1007/s10640-021-00585-7
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    6. Zenno, Yoshihiro & Aruga, Kentaka, 2023. "Investing the factors affecting green bond investments in China: Cases for Beijing and Shenzhen," MPRA Paper 116203, University Library of Munich, Germany.
    7. Emre Arat & Britta Hachenberg & Florian Kiesel & Dirk Schiereck, 2023. "Greenium, credit rating, and the COVID-19 pandemic," Journal of Asset Management, Palgrave Macmillan, vol. 24(7), pages 547-557, December.
    8. Yoshihiro Zenno & Kentaka Aruga, 2023. "Investigating Factors Affecting Institutional Investors’ Green Bond Investments: Cases for Beijing and Shenzhen," Sustainability, MDPI, vol. 15(6), pages 1-16, March.
    9. Danilo Liberati & Giuseppe Marinelli, 2024. "Was Covid-19 a wake-up call on climate risks? Evidence from the greenium," Questioni di Economia e Finanza (Occasional Papers) 832, Bank of Italy, Economic Research and International Relations Area.
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    11. Carè, R. & Weber, O., 2023. "How much finance is in climate finance? A bibliometric review, critiques, and future research directions," Research in International Business and Finance, Elsevier, vol. 64(C).
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