In addition, Aristotle was a firm supporter of private property. He refuted Plato's argument for a collectivist society in which family and property are held in common: Aristotle makes the argument that when one's own son or land is rightfully one's own, one puts much more effort into cultivating that item, to the ultimate betterment of society. He references barbarian tribes of his time in which property was held in common, and the laziest of the bunch would always take away large amounts of food grown by the most diligent.