About the Authors

Juan A. Crespo

juan.crespo@uam.es

Affiliation Departamento de Economía Cuantitativa, Universidad Autónoma de Madrid, Madrid, Spain

Ignacio Ortuño-Ortín

Affiliation Departamento de Economía, Universidad Carlos III de Madrid, Madrid, Spain

Javier Ruiz-Castillo

Affiliation Departamento de Economía, Universidad Carlos III de Madrid, Madrid, Spain

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JAC IO-O JR-C. Performed the experiments: JAC IO-O JR-C. Analyzed the data: JAC IO-O JR-C. Contributed reagents/materials/analysis tools: JAC IO-O JR-C. Wrote the paper: JAC IO-O JR-C.