1. Doctorate School, University of the Basque Country UPV/EHU, Bilbao, Spain
2. Department of Quantitative Methods, University of the Basque Country UPV/EHU, Bilbao, Spain
3. Family Enterprise Chair, University of the Basque Country UPV/EHU, Bilbao, Spain
4. Spanish Royal Academy of Economics and Finance, Barcelona, Spain