That right there is a progressive fallacy.
People who live in slavery under communism are not always bought and sold. The slaves who built the Great Wall and the Terracotta Army were not always bought and sold.
The slaves who ended up in the western hemisphere on British ships were slaves before they were bought and sold - enslaved by islamic raiders and other african conquerors.
How about all of the sex slaves held in captivity right now as we speak? Many of whom have never been bought and sold? Must not be slaves after all, if we follow this "bought and sold" business to its logical conclusion.
“That right there is a progressive fallacy.”
No, it’s called “logic”. You should give it a try some time.