Time–frequency dynamics of biofuel–fuel–food system

Lukas Vacha, Karel Janda, Ladislav Krištoufek () and David Zilberman

Energy Economics, 2013, vol. 40, issue C, 233-241

Abstract: For the first time, we apply the wavelet coherence methodology on biofuels (ethanol and biodiesel) and a wide range of related commodities (gasoline, diesel, crude oil, corn, wheat, soybeans, sugarcane and rapeseed oil). This way, we are able to investigate dynamics of correlations in time and across scales (frequencies) with a model-free approach. We show that correlations indeed vary in time and across frequencies. We find two highly correlated pairs which are strongly connected at low frequencies – ethanol with corn and biodiesel with German diesel – during almost the whole analyzed period (2003–2011). Structure of correlations remarkably changes during the food crisis — higher frequencies become important for both mentioned pairs. This implies that during stable periods, ethanol is correlated with corn and biodiesel is correlated with German diesel mainly at low frequencies so that they follow a common long-term trend. However, in the crisis periods, ethanol (biodiesel) is led by corn (German diesel) even at high frequencies (low scales), which implies that the biofuels prices react more rapidly to the changes in their producing factors.

Keywords: Biofuels; Prices; Correlations; Wavelet coherence (search for similar items in EconPapers)
JEL-codes: C22 Q16 Q42 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (37)

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Related works:
Working Paper: Time-Frequency Dynamics of Biofuels-Fuels-Food System (2013)
Working Paper: Time-Frequency Dynamics of Biofuels-Fuels-Food System (2012)
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Persistent link: https://EconPapers.repec.org/RePEc:eee:eneeco:v:40:y:2013:i:c:p:233-241

DOI: 10.1016/j.eneco.2013.06.015

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