“…Knowledge can pass from one organization to another in a variety of ways, including via mergers (Ang and Wu, 2011;Jost and Van de Velden, 2006), sale or licensing (Anton and Yao, 2002;Buenstorf and Geissler, 2009), technology pools (Lerner and Tirole, 2004;Lerner et al, 2007), open source protocols (Lerner and Tirole, 2002), joint investment projects (Goyal et al, 2003), demonstrations (Gill, 2008), inter-organizational spillovers (De Bondt, 1997) and research joint ventures (Amir et al, 2003;Suzumura, 1992;Roller et al, 2007). Three of the papers in this volume, Cassiman et al (2010), Squicciarini (2010) and Clark and Sand (2010) study aspects of spillovers.…”