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Content diversity, a journalistic tenet that addresses the concept of the marketplace of ideas, is a fundamental dimension of news diversity. This content analysis of newspaper articles measures the difference between diversity of ideas (content) and diversity of sources, two constructs that others have assumed are highly correlated. The findings indicate that the difference is substantial. Although content diversity may sometimes accompany source diversity, it is fallacious to assume that one ensures the other.
Voakes et al. (Sun,) studied this question.