I think that whole program is a legacy of FDR's New Deal.
Seems like I read that the quotas were based on how much tobacco the particular farm produced in 1938.
Not to belabor the whole horse/buggy thing, but some of the carriage makers actually got into building cars or other similar things.
I believe that Studebaker was one of them... of course they are gone now, but they made it work up until the early-mid 60's.
There was a local company here in Wilson called Hackney Body which used to make wagons and eventually converted into making milk & other delivery trucks.
But I digress - and I see your point.