Who gets to originate the claim on property? Who gets to set the price and collect on the sale?

Freedom isn't necessarily for everyone has also been mentioned throughout time. Slavery has existed all through history.

That doesn't make it ok but anyone who is an enslavery or aspiring enslaver is going to argue some people want to be slaves.

Removing and restricting the agency of others is never ok. When it's for economic gain, it's always exploitation.