This isn't as clear cut as you are making it. A lot of infrastructure haa pushed the price of food down. As prices go down, so do margins. Making a living as a

This isn't as clear cut as you are making it. A lot of infrastructure haa pushed the price of food down. As prices go down, so do margins. Making a living as a farm hand has better margins without the interstate highway system for example. The supposed "subsidies" to rural areas are the cost of creating the low prices which cities also reap a lot of benefit from. You in fact could not easily substitute rural monoculture for something else. Not at today's prices.