| Summary: | 碩士 === 輔仁大學 === 經濟學系碩士班 === 103 === This thesis studies the program type of a media channel which is described by a program characteristic of a spatial model. The horizontal differentiation between different channels shows the diversity of program channels. My conclusion is that under free competition, the program location of two channels will agglomerate at in the middle of a characteristic space. In other words, the degrees of horizontal program differentiation of television channels reaches a minimum. However, the program locations of the two channels should be located at two extreme ends so that the socially optimal locations exhibit maximum differentiation.Besides, the government can induce the program location of the media channels to reach the results of social welfare maximum through some public policies.
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