Abstract Moral Psychology focuses in understanding how moral characteristics develop and how they are integrated in the human personality. We consider that an individual who presents aspects relating to the duties and virtues as central to its personality, develops what we call as an ethic personality. The solidary economy, on the other hand, translates in its practices aspects of ethical behavior, such as fair price, cooperation and sustainability. This study aims to show the Moral Psychology as a theoretical instrument able to promote debates regarding solidary economy. Despite their different final goals, both the solidary economy and the discussions on moral psychology aims, in their principles, at the human formation, the ethics in relationships and the individual and community developments. Thus, understanding the debate on Moral Psychology is the condition to discuss intervention projects that aim to sensitize and form the solidary economy, as it is the regulator of the actions.