Affiliation: | 1. Department of Economic Analysis, University of Zaragoza, Gran Vía 2‐4, 50005 Zaragoza, Spain (e‐mail: jmur@unizar.es, aangulo@unizar.es);2. Department of Quantitative Methods and Computing, Technical University of Cartagena, Paseo Alfonso XIII, 50‐30203 Cartagena, Spain (e‐mail: fernando.lopez@upct.es) |