This presentation by Caroline Teyssié, Rapporteure at the Autorité de la concurrence (French Competition Authority), was made during the Workshop on market studies selection and prioritisation of sectors and industries held on 9 March 2017 at the OECD Headquarters. More papers and presentations on the topic can be found out at http://www.oecd.org/daf/competition/market-studies-workshop-on-selection-prioritisation-of-sectors-industries.htm