With the growth of digitization and globalization, media companies expanded and concentrated themselves in media industry or cross-media industry.There are three different forms of expansion and concentration in media industry, which includes horizontal, diagonal and vertical expansion. This essay analyzes the different forms of media expansion and concentration and find that the major advantage media concentration is that economies of scale and scope are able to occur. It means efficiency and market power of media industry could be increased. At the same time, the disadvantage of media concentration is that exceeding market power may damage the normal competition. Thus, policies of media expansion and concentrations should also be focused.
