NOTA DI LAVORO 91.2011 Oil Price Forecast Evaluation with Flexible Loss Functions By Andrea Bastianin, Department of Statistics, University of Milan-Bicocca, and Fondazione Eni Enrico Mattei, Italy Matteo Manera, Department of Statistics, University of Milan-Bicocca, and Fondazione Eni Enrico Mattei, Italy Anil Markandya, BC3 Basque Centre for Climate Change, Bilbao, Spain Elisa Scarpa, Edison Trading, Milan, Italy