- Ancient slavery varied in different societies but generally slaves had no rights, could not marry or attain citizenship, and were completely under the power of their master. - Manumission, the freeing of slaves, was rare in places like Athens but more common in Rome where it was sometimes used strategically to create networks of patrons and clients. - Usury, lending money at interest, was considered an "unnatural" and hated form of wealth acquisition by Aristotle and was forbidden by the medieval church. Aristotle saw money as a means of facilitating exchange, not a commodity.