I believe the answer is: 2. but should be abolished.
The abolitionists see slavery as inhumane and should be stopped. This view become even more popular after the industrial revolution that come from western Europe, which eliminate the needs of using slave labour since it can be replaced with machines.
They were the best Ship Builders and best Sailors of Mesopotamia. They made the first see through glass.
Answer: There's less money in circulation; there are plenty of goods but no demand so prices drop.