Media bought up through mergers and acquisitions and owned by a handful of transnational corporations such as News International and Google. The American political economists Herman and Robert McChesney argue that the presence of global media is a cause for concern because their power challenges governments. It also has an adverse effect on media diversity because although there appear to be lots of outlets, they are owned by only a few companies.
Chandler, Daniel - Munday, Rod (2011): Dictionary of Media and Communication. Oxford University Press. 176 p. See the Online Version