AI and Market Power

OECD AI Papers No. 62 on French and Portuguese firm microdata plus global patent and start-up databases: non-GenAI adopters hold 7.5×/3.2× the market share of non-users, but the premium is selection (dies once broadband, digitalisation and lagged productivity enter) and adopters gain no market-share rank or markup growth over five years; firm-level GenAI exposure is inverted-U in size and market share while monotone in productivity and tertiary education; global AI-patent concentration *fell* 32–60% over 2001–21 yet correlates positively with sales concentration within markets; AI patents raise markups only in ICT (+7.95% interaction); and GenAI start-ups take ~130% more VC and are ~21% more likely to be acquired by incumbents