This presentation by Amelia Fletcher, Professor of Competition Policy, Norwich Business School and Non-Executive Director, UK Financial Conduct 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