If they share institutional and sociological similarities, what is the cause of the variation presented by the fragmentation of the party system at the sub-national level? This article proposes that party leaders consider the expected benefit and the expectation of gaining some constituency: in territories with few resources, an increase in the budget is followed by an increase in fragmentation; while, where resources are abundant, an increase in the budget is followed by a decrease in fragmentation. Using an unpublished database created by the author, the theoretical proposal is tested in three Mexican municipalities enrolled in the Pueblos Mágicos Program: the results of the ITSA regression model are consistent with the theoretical proposal, since being a magical town has an impact in the ENP.