Economics at your fingertips  

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

Ikram Jebabli () and David Roubaud

Economic Modelling, 2018, vol. 70, issue C, 97-114

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.

Keywords: Long-term efficiency; Short-term inefficiencies; Hedging; Rolling Hurst exponent; Threshold vector error correction model (search for similar items in EconPapers)
JEL-codes: G14 O13 Q02 Q14 Q18 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: Track citations by RSS feed

Downloads: (external link)
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link:

Access Statistics for this article

Economic Modelling is currently edited by S. Hall and P. Pauly

More articles in Economic Modelling from Elsevier
Bibliographic data for series maintained by Dana Niculescu ().

Page updated 2019-03-31
Handle: RePEc:eee:ecmode:v:70:y:2018:i:c:p:97-114