Farmers are just like any other business...they are going to grow what provides the best return on investment. The marketplace makes many of the decisions...
There are two supplies of land; one is land that has been developed and is transferred from one owner to another, and the other is undeveloped land that can be transitioned into farming. Neither of these is fixed!
No, that is nothing but fallacious and disingenuous garbage, like saying the supply of Rembrandts is not fixed because there are two supplies of Rembrandts: those that are in frames, and those that can be put into frames. Neither of these is fixed -- but that doesn't stop the sum of them from being fixed. GET IT??? You will simply do, say, and believe anything whatever in order not to know the facts that prove your beliefs are false.
Too much for you, obviously, as you have to contrive some means of not knowing the facts I identified. It's a job. Some people like it, others don't. But lots of people find it's too much work for too little return.
So you agree that you have been comprehensively and conclusively refuted, you know it, and you have no answers. Good.