club theory
n.— «The theoretical basis of the idea that the EU faces problems of “absorption capacity” is borrowed from what is known as “club theory.” This focuses on the difficulties any large club has in making decisions and conducting common policies. As the club increases in size, so the argument runs, the more difficulties arise and the more the benefits of club membership become diluted.» —“‘Absorption capacity’: the wrong European debate ” by Frank Vibert openDemocracy June 21, 2006. (source: Double-Tongued Dictionary)
The EU has had an ongoing debate about “deepening” versus “widening”, and it’s a serious talk about what exactly it is that various national givernments really do want. I’ll take a WAG that “club theory” is an attempt to completely moronicize this debate.