2018/09/04: Rightly or wrongly, many associate Mill’s On Liberty with the motif of a “marketplace of ideas,” a realm that, if left to operate on its own, will drive out prejudice and falsehood and produce knowledge. But this notion, like that of a free market generally, is predicated on a utopian conception of consumers. In the case of the metaphor of the marketplace of ideas, the utopian assumption is that conversation works by exchange of reasons: one party offers its reasons, which are then countered by the reasons of an opponent, until the truth ultimately emerges.
But conversation is not just used to communicate information. It is also used to shut out perspectives, raise fears, and heighten prejudice.