Since economy incites interpretations, it belongs to semiotics. Economy is one of semiotic forms of reasoning in politics. This paper deals with semiotics, the logic of politics, and the link between politics and psychology. The domain of politics is founded on the encounter between identities of actors expressed in exchange, in money, in trade, and in metalinguistic terms. The semiotics of economy is a political form of semiotics since money is an expression of power. The institution of money and of swap exchange are expressions of semiotization of the economy because money may be compared to language. The institution of money by power can be compared to the institution of language by political power. Economy also belongs to politics because there is in it an expression of utopia and of imagination. Hence, it is possible to apply to economy the three instances elaborated by psychanalyst J. Lacan : the real, the imaginary, and the symbolic.