The "marketplace of ideas" metaphor has been interpreted from democratic and economic theory perspectives. These different interpretive approaches emphasize different policy objectives and have been associated with divergent regulatory philosophies. To reach a deeper understanding of how regulators have interpreted and applied the marketplace of ideas metaphor, I analyzed the use of the metaphor over the past 33 years by the Federal Communications Commission (FCC). I conducted content analysis on each FCC decision, from mid-1965FCC decision, from mid- through mid-1998 which the "marketplace of ideas" terminology was used. The results suggest that the metaphor typically has been used within the context of deregulatory actions, and that, in recent years, the Commission increasingly has focused on the economic theory dimension of the metaphor. However, the results for the 33-year period indicate no significant relationship between the type of regulatory action taken and the theoretical interpretation of the marketplace of ideas metaphor employed.The "marketplace of ideas" metaphor is one of the foundation concepts in communications regulation. As such, it has been the subject of intensive scrutiny and analysis in legal, academic, and policy circles (e.g.A key point that emerges from these analyses is that the metaphor contains elements of both democratic theory and economic theory. This duality has allowed widely divergent interpretations of the metaphor to develop. My central concern in this paper is that these different theoretical approaches emphasize different policy objectives. Economic theory-based interpretations of the marketplace of ideas emphasize efficiency, consumer satisfaction, and competition, whereas democratic theory-based interpretations emphasize citizen knowledge, informed decisionmaking, and effective self-government. Within discussions of the marketplace of ideas metaphor, economic theory-based interpretations typically have been associated with arguments against government regulation of the communications industry, whereas democratic theory-based interpretations typically have been asso-