That's on top of my head. I'm no expert.

Earth provides enough to satisfy every man's need, but not every man's greed. Gandhi

The combine harvester isn't the only criterion, btw - farmers aren't all pure grain producers. There's a drive in most of the EU to wipe out smaller dairy producers, for instance. It works mainly by scheduled reductions in milk prices paid to producers. That is, planned elimination of the smaller units.