 To sum up, the city-state is a hylomorphic (i.e., matter-form) compound of a particular population (i.e., citizen-body) in a given territory (material cause) and a constitution (formal cause). The constitution itself is fashioned by the lawgiver and is governed by politicians, who are like craftsmen (efficient cause), and the constitution defines the aim of the city-state (final cause, IV.1.1289a17–18). Aristotle’s hylomorphic analysis has important practical implications for him: just as a craftsman should not try to impose a form on materials for which it is unsuited (e.g. to build a house out of sand), the legislator should not lay down or change laws which are contrary to the nature of the citizens. Aristotle accordingly rejects utopian schemes such as the proposal in Plato’s Republic that children and property should belong to all the citizens in common. For this runs afoul of the fact that “people give most attention to their own property, less to what is communal, or only as much as falls to them to give attention” (Pol. II.3.1261b33–5). Aristotle is also wary of casual political innovation, because it can have the deleterious side-effect of undermining the citizens’ habit of obeying the law (II.8.1269a13–24). For a further discussion of the theoretical foundations of Aristotle’s politics, see the following supplementary document: