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Energy markets and green bonds: A tail dependence analysis with time-varying optimal copulas and portfolio implications

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  • Naeem, Muhammad Abubakr
  • Bouri, Elie
  • Costa, Mabel D.
  • Naifar, Nader
  • Shahzad, Syed Jawad Hussain

Abstract

We examine the asymmetric and extreme tail dependence between five energy markets (crude oil, natural gas, heating oil, gasoline, and coal) and green bonds using a time-varying optimal copula (TVOC) model. The results indicate the existence of multiple tail dependence regimes, implying the unsuitability of applying static or dynamic models to entirely describe the extreme dependence between energy markets and green bonds. There is an extreme negative tail dependence between green bonds and four energy commodities (crude oil, heating oil, gasoline, and coal), whereas an extreme positive tail dependence is shown for green bonds and natural gas. Largely, stressful periods such as the COVID19 outbreak, shape the tail dependence, which is also the case for extreme risk spillovers involving, especially, crude oil. Hedging effectiveness analysis indicates that green bonds can effectively hedge most of the energy commodities. The conditional diversification benefits seem to vary with time, especially for natural gas, and differ across the energy markets. Notably, green bonds provide higher conditional diversification benefits when combined with coal for several portfolio weights.

Suggested Citation

  • Naeem, Muhammad Abubakr & Bouri, Elie & Costa, Mabel D. & Naifar, Nader & Shahzad, Syed Jawad Hussain, 2021. "Energy markets and green bonds: A tail dependence analysis with time-varying optimal copulas and portfolio implications," Resources Policy, Elsevier, vol. 74(C).
  • Handle: RePEc:eee:jrpoli:v:74:y:2021:i:c:s030142072100427x
    DOI: 10.1016/j.resourpol.2021.102418
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    More about this item

    Keywords

    Green bonds; Energy commodities; Asymmetric tail dependence; Time-varying optimal copula; Extreme spillovers; Hedging; Conditional diversification benefits;
    All these keywords.

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • Q41 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Demand and Supply; Prices
    • Q43 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy and the Macroeconomy

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