“…Theoretical studies Steiner (1952), Beebe (1977), Spence and Owen (1975), Wildman and Owen (1985), Gal-Or and Dukes (2003), Gabszewicz et al (2004), Anderson and Coate (2005) Empirical studies Vertical diversity Dominick and Pearce (1976), Litman (1979), Lin (1995), Napoli (1997), Einstein (2004aEinstein ( , 2004b) Horizontal diversity Einstein (2004aEinstein ( , 2004b With regard to empirical studies that investigate the relationship between the ownership rule and program diversity, Napoli and Yan (2007) and Yan and Park (2009) examined the impact of relaxation of the ownership rule on the programming of local television broadcasters in the United States. Berry and Waldfogel (2001) investigated the impact of relaxation of the ownership rule on radio programming in the United States, stating that program diversity increased after relaxation of the ownership rule, although the market concentration did also.…”