How does this contradict the point that GP made? GP did not imply that you get a free piece of leather with each cow slaughtered, just a hide. Btw, even game e

How does this contradict the point that GP made? GP did not imply that you get a free piece of leather with each cow slaughtered, just a hide. Btw, even game economy models this part - in Dwarf Fortress a slaughtered animal produces skin, which will decompose if not tanned or converted to parchment.