 The virtuous city is the only that can make its inhabitants happy because they achieve their perfection. It is characterized by the absence of the art of medicine and the art of adjudication. Avempace follows Plato, but his version is also characterized by the absence of weeds (IB-RS-AP: 10. 16–18; IB-RS-berman: 126; IB-coll-genequand: 126 §32). Avempace explains that in imperfect cities there are false opinions, but that the majority of inhabitants accept them as right, or that there are contradictory positions and that there is no way to know which one is true.