In retail markets, competition among firms happens "locally". But what is the right way to define the local geographic market? Using a natural experiment involving petrol stations on Greek islands and in Athens, Christos Genakos and Themistoklis Kampouris show that the methodologies both researchers and competition authorities use to define local markets are, to put it bluntly, wrong.
Christos Genakos and Themistoklis Kampouris
16 March 2026
LSE Business Review
https://blogs.lse.ac.uk/businessreview/2026/03/16/everything-you-thought-you-knew-about-local-markets-is-wrong/
This work is published under POID and the CEP's Growth programme.