Bio-ethanols 1 Bioethanol 1 Biofuels policies Commerce 1 Costs 1 Cross-correlations 1 Detrended cross-correlations analysis 1 Detrended fluctuation analysis 1 Ethanol 1 Ethanol-gasoline relative price 1 Fuel retail market 1 Gasoline 1 Hurst 1 Public policy 1 Relative prices 1 Retail market 1 biofuel policy 1 cross-correlation 1 ethanol-gasoline relative price 1 fuel retail market 1