The "marketplace of ideas" is a rationale for freedom of expression based on an analogy to the economic concept of a free market. The "marketplace of ideas" belief holds that the truth or the best policy arises out of the competition of widely various ideas in free, transparent public discourse, an important part of liberal democracy. Image:Oliver Wendell Holmes Jr circa 1930.jpg The actual term "marketplace of ideas" was first used in the 1967 Supreme Court decision, Keyishian v. Board of Regents in which the the Court stated that "The classroom is peculiarly the "marketplace of ideas."