1. Oxford Martin School, Oxford University, Oxford, OX1 3BD, UK. e-mail: pantelis.koutroumpis@oxfordmartin.ox.ac.uk
2. Dyson School of Applied Economics and Management, Cornell University, Ithaca, NY 14853, USA. e-mail: aija.leiponen@cornell.edu
3. Department of Business and Technology, LaSalle Universitat Ramon Llull, Barcelona 08022, Spain