Wikipedia – A New Community of Practice? O'Sullivan discusses the group's aims; its community and make-up; its costs of doing business (transaction costs); its relations with the public; and its legacy. The second part of the book applies the group theory approach to Wikipedia, devoting a chapter to each aspect. Chapter 10, on the structure of Wikipedia, explains the use of "talk pages" and . Chapter 13, "Wikipedia and the Nature of Knowledge," explores the question of expertise. In this chapter O'Sullivan claims a fundamental disagreement between Wikipedia's two founders, Jimmy Wales and Larry Sanger. While Wales, an admirer of the economist Friedrich Hayek, believed in the
Jimmy Wales the Nupedia and Wikipedia projects until Bomis discontinued funding for his position in February 2002; Sanger resigned as editor-in-chief of Nupedia and as "chief organizer" of Wikipedia on March 1 of that year. Early on, Bomis supplied the financial backing for Wikipedia, and entertained the notion of placing advertisements on Wikipedia before costs were reduced with Sanger's departure and plans for a nonprofit foundation were advanced instead. Wales has asserted that he is the sole founder of Wikipedia, and has publicly disputed Sanger's designation as a co-founder. Sanger and Wales were identified as co-founders at least as early as September