This paper is aimed at: (1) discussion of the geographical market delimitation, considering the decision-making methods used by anti-trust authorities; and (2) verification of the geographical scope of the sugar market using the Elzinga-Hogarty test. This market is defined as domestic market in the decisions of the European Commission and Polish anti-trust authorities. The comprehensive research (covering ca. 80 countries of the world supplying ca. 98% of the global sugar supply) showed that – in the light of the Elzinga-Hogarty method – most of the countries fail to meet the criteria of the LOFI/LIFO tests, which means that the geographical scope of the sugar market is usually supranational. The findings comply – in the general dimension – with the mainstream of the criticism of the European anti-trust authorities for too narrow definition of the markets and, in the detailed dimension – with the opinion of the representatives of the industry and scientists dealing with the sugar sector concerning the supranational scope of the sugar market. This controversy points to the need for further research and discussions on the geographical market delimitation. Moreover, the issue should be covered with reference to other agri-food markets – using both the methodology developed with anti-trust proceedings in mind, as well as the concepts stemming from strategic management.