Who argued that concentrated media ownership and convergence affect the diversity of messages offered by the mass media?

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Bagdikian, a media critic and author, argued in his book "The Media Monopoly" that concentrated media ownership and convergence lead to a decrease in the diversity of messages offered by the mass media, as media corporations prioritize profits over providing varied and independent content.

Who Argued That Concentrated Media Ownership and Convergence Affect the Diversity