“…Branstetter, Fisman and Foley (2006) focus on a di §erent research question, investigating how the extent of technology transfers 5 See Aghion et al (2001) and Acemoglu, Aghion and Zilibotti (2006), in particular, but also Acemoglu (2009), and Acemoglu and Akcigit (2012). With regard to the related theoretical literature in industrial organization, we refer the reader, among others, to Tirole (1988), Scotchmer (2004), Gilbert (2006), Vives (2008), and Schmutzler (2010, 2012. 6 In Aghion et al (2005, the SMP provides the excluded instruments that are used in instrumental variable and control function models explaining innovation or productivity growth.…”