This note was prepared by Richard May of the OECD Competition Division, with support from Aurelien Boronat, Charles Rezé-Sanoussi and Maddalena Grassi. Helpful comments and review were provided by Ori Schwartz, Antonio Capobianco and Federica Maiorano, also of the OECD Competition Division. The note was prepared to serve as background material for discussions on “Market Studies and Other Market Analysis Tools” taking place at the 3 December 2025 session of Working Party 2 of OECD Competition Committee.