The number of schools offering the programmes of the International Baccalaureate (IB) hit 3000 in July 2010. Since 2004 the IB has aimed for further growth within a "wider access" and "greater impact" paradigm. A "further" 7000 schools are expected to be involved by 2020. However, there is now considerable concern about growth, especially within the "international school movement" who see it as compromising quality. This recent phenomenon can be termed "growth scepticism" in the same way economic growth is now questioned as desirable. This paper charts this development and argues there is room for a much wider framework of analysis, viewing the global growth of the IB within a social and moral lens. This paper takes the economist Fred Hirsch's 1976 book "The social limits to growth" as its core theoretical framework, linking growth to potential social externalities such as increased competition and the commercialization of society.