The Supreme Court Defines the Marketplace of Ideas

The marketplace of ideas metaphor is the model most called upon by the U.S. Supreme Court in the resolution of free-expression cases. Justices have used the theory in the adjudication of virtually every area of First Amendment law, despite increasing attacks on the theory. For the most part, however, the Court does not recognize a single, universal marketplace of ideas, but numerous mini-marketplaces, each with its own dynamics, parameters, regulatory scheme, and audience.