This assumes that large landowners and food conglomerates are 100% rentiers. That the money they make is based on the amount they can extract, and not on the v

This assumes that large landowners and food conglomerates are 100% rentiers. That the money they make is based on the amount they can extract, and not on the value they provide. You're describing a system which is not democratic capitalism, it is serfdom. If that were the case, why would we continue to allow that?