Most slaves through history weren't created products. They were spoils of war that became a product. So they would always have them as long as they continued their conquesting, they just ceased to export them and just kept them internally.
There are more slaves in the world right now than there were in most of history, despite more than half the world "banning" it.
What about the laws of supply and demand? Surely a drop in demand means that fewer people were enslaved after each country banned the practice.
Most slaves through history weren't created products. They were spoils of war that became a product. So they would always have them as long as they continued their conquesting, they just ceased to export them and just kept them internally.
There are more slaves in the world right now than there were in most of history, despite more than half the world "banning" it.