Misleading Advertising in Duopoly

In this paper, we build a model of strategic misleading advertising in duopolistic markets with horizontal product differentiation and advertising externality between firms. We investigate the effects of regulating misinformation on market competition, behavior of firms, and social welfare. We show that the degree of advertising externality and the magnitude of advertising costs are crucial for determining the welfare effects of several regulations, including prohibiting misleading advertising, educating consumers, taxing production, and taxing misleading advertising. We then extend the model by introducing two types of heterogeneities; heterogeneous consumers and heterogeneous production costs between firms.