“…To best capture the extensive margin of AI use across industries, we combine usage rates across AI-related technologies. That said, our findings largely represent variation in the use of "machine learning" in production.3 Young firms are disproportionately single-unit, and hence straightforward to situate geographically.4 Studies of AI use and impacts outside of the United States have been on the rise, including in Europe(Czarnitzki et al, 2023;Hoffreumon et al, 2023), China(Beraja et al, 2023;Lu et al, 2023), Canada(Alexopoulos & Cohen, 2018), and in the context of international tradeGoldfarb & Trefler, 2019).5 See alsoAlcacer and Delgado (2016),Delgado et al (2010), andForman et al (2005), inter alia.6 For example,Akcigit et al (2022),Botelho et al (2021),Catalini et al (2019), and Lerner and Nanda (2020).7 SeeBrynjolfsson and Milgrom (2013) for more on complementarity theory and a review of the literature.8 Such details are captured via responses from "primary owners" to the ABS, which excludes publicly traded firms, estates, trusts, government and tribal entities, associations, membership clubs, cooperatives and foreign entities. 9 Specifically, we recalculate the sample weights by stratifying the firms in the 2017 LBD and our final sample of firms in the ABS on firm size, age, and industry.…”