One of the enduring questions in media management research and regulations has been about the relationship between media competition and media performance. Over the past quarter century,the rapid consolidation of ownership in media industries in the United States and other developed nations has focused the attention of scholars and policymakers on how the changing structure of media markerts may be affecting the public interest. Two key assumptions have dominated these discussions. The first is that media competition is a positive force improving service of the public interest.This assumption parallers general theories in economics, which hold that competition leads to more consumer choice, lower prices,and higher-quality products as organizations strive with one another to attract customers. The sceond assump-ption is that media play a central role in society by providing diverse ideas,informing the public about current events and social issues,and serving as a watchdog on the government. 自已有试着翻译，可是总觉得不流畅，中文的表达上，所以麻烦翻译还不错的人替我 翻译一下，如果你可以成为替我看看我自已翻的文章通不通顺的人，可寄我站内信 因为这只是其中的一篇，我掐指算算後头还有五、六篇，不瞒各位我是为了考试而准备 练习翻译，就是缺了位可以替我阅卷的人，跪求罗!!!! -- http://zh-tw.facebook.com/people/Elsa-Wang/1513189463 跌倒次数是我累积人生历练的另类成就 --

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