*yawn* So it's usually appropriation from the previous owner.
You mean, theft? Or did they pay that previous owner for the property?
*double yawn* Some exchange is made and the new person somehow gets the materials from the previous person.
Yes, that's the way capitalism works. A voluntary exchange of value for value is made, and the new owner gets the materials from the old owner.
You mean that would be how your simplified theory of Capitalism
might work if it weren't for all that confusing "real world" stuff that keeps getting in the way.