This article develops a pragmatic theory of finance in which markets are considered to be centres of communicative action in the face of uncertainty. This contrasts with the conventional approach that portrays markets as centres of strategic action in the face of scarcity. The argument follows Habermas and entails that a financial market must address the truthfulness, truth, and rightness of the statements made by its participants (i.e., the prices quoted). I claim that these discursive norms have been implicit in historical financial markets as expressed in the norms of sincerity, reciprocity, and charity. I conclude by proposing that ‘trust’ in commerce is a synthesis of the three discursive norms. The motivation of the article is to addr...