During the 400 years of the trans-Atlantic slave trade, there were 13 million people taken from Africa. Today, there are 27 million people who are enslaved.
During the trans-Atlantics slave trade, in adjusted dollars, a slave was sold for around $40,000. Today, slaves are worth close to $40.
Simple economics....supply and demand. As the supply increases, the cost decreases.
It is a sad world when people are compared to simple economic truths instead of seen to have value and worth.