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Time-varying efficiency in food and energy markets: Evidence and implications

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  • Ikram Jebabli

    (CleRMa - Clermont Recherche Management - ESC Clermont-Ferrand - École Supérieure de Commerce (ESC) - Clermont-Ferrand - UCA [2017-2020] - Université Clermont Auvergne [2017-2020])

  • David Roubaud

    (MRM - Montpellier Research in Management - UPVM - Université Paul-Valéry - Montpellier 3 - UPVD - Université de Perpignan Via Domitia - Groupe Sup de Co Montpellier (GSCM) - Montpellier Business School - UM - Université de Montpellier)

Abstract

This paper analyses weak-form efficiency in daily spot and futures prices in the food and energy markets, given the simultaneous volatilities characterising prices in both markets. To determine the structural breaks and efficiency changes over time, we use the time-varying rolling Hurst exponent and threshold vector error correction models. Our main findings indicate that all of the studied commodities exhibit long-term efficiency and short-term inefficiencies that can be explained by global economic conditions: the 2008 global financial crisis, financialisation of commodities markets, and fluctuations in crude oil prices. Time-varying optimal weights minimising the portfolio risk show different patterns between food and crude oil. In terms of hedging effectiveness, food futures are better than crude oil futures. Therefore, optimal portfolios risk hedging requires an adequate rebalancing between spot and futures prices depending on markets conditions and the type of commodities considered. Investigation of the semi-strong efficiency form of these markets through the consideration of intra-day prices could constitute a future extension of the present work.
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Suggested Citation

  • Ikram Jebabli & David Roubaud, 2018. "Time-varying efficiency in food and energy markets: Evidence and implications," Post-Print hal-02330557, HAL.
    • Handle: RePEc:hal:journl:hal-02330557
    DOI: 10.1016/j.econmod.2017.10.013
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    JEL classification:

    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • O13 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Agriculture; Natural Resources; Environment; Other Primary Products
    • Q02 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General - - - Commodity Market
    • Q14 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Agricultural Finance
    • Q18 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture - - - Agricultural Policy; Food Policy; Animal Welfare Policy

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