This study investigates how green investment assets improve optimal portfolio diversification in terms of tail downside risk. We use the wavelet conditional value-at-risk ratio to explore the benefits of adding green assets to conventional portfolios. We quantify risk based on the contagion between conventional stock market indices and green environmental assets, including a sustainability index, clean energy, and green bonds. Our findings emphasize the high variance between conventional stock pairs, providing evidence of contagion effects before and during the COVID-19 pandemic. We show that including clean energy and green bond indices in conventional portfolios reduces the extreme risk of portfolios. In addition, we find that the diversification benefits of clean energy, green bonds, and safe-haven investments apply especially in the short term during the pandemic. Finally, we show that the considered portfolios could not decrease long-term risk during the COVID-19 crisis because of the systematic risk spread. Our portfolio optimization design supports the superiority of clean energy and green bonds in portfolio diversification over the sustainability index. These insights can be used by portfolio managers to inform diversification in different investment horizons.

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L’intelligence artificielle est omniprésente en entreprise, mais son usage reste souvent mal structuré. Notre recherche propose une méthodologie en quatre étapes pour cartographier les usages de l’IA et en évaluer les risques. Nous avons identifié trois catégories de risques : managériaux, organisationnels et juridiques. Nos résultats montrent que l’IA est souvent déployée sans vision globale, que les risques sont sous-évalués et qu’une gouvernance adaptée est essentielle. Nous recommandons aux entreprises de cartographier leurs usages, de réaliser des audits réguliers, de mettre en place un cadre de gouvernance clair et de former leurs équipes. L’objectif est de faire de l’IA un levier de transformation maîtrisé plutôt qu’une source de risques mal anticipés.
SCHOCH Patrice - EDC Business School |
- Recherche
- Gouvernance, Théorie des Organisations, Transformation Digitale