The Wealth of Nations by Part 3 Chapter 2 Page 14

It is only in the western and southwestern provinces of Europe that it has gradually been abolished altogether.

But if great improvements are seldom to be expected from great proprietors, they are least of all to be expected when they employ slaves for their workmen.

The experience of all ages and nations, I believe, demonstrates that the work done by slaves, though it appears to cost only their maintenance, is in the end the dearest of any. A person who can acquire no property, can have no other interest but to eat as much, and to labour as little as possible. Whatever work he does beyond what is sufficient to purchase his own maintenance can be squeezed out of him by violence only, and not by any interest of his own. In ancient Italy, how much the cultivation of corn degenerated, how