1. Department of Management and Technology and Invernizzi Center for Research on Innovation, Organization, Strategy and Entrepreneurship (ICRIOS), Università Bocconi, 20136 Milan, Italy;
2. Centre for Economic Policy Research, London EC1V 0DX, United Kingdom;
3. College of Business Administration, Loyola Marymount University, Los Angeles, California 90045;
4. Cass Business School, City, University of London, London EC1Y 8TZ, United Kingdom;
5. Haas School of Business, Institute for Business Innovation, University of California, Berkeley, Berkeley, California 94720