There lies the problem. Our hypothetical farm in 2060 is capable of manufacturing thousands of tons of food with a staff of four people to maintain the robots. They can sell that for next to nothing and still break even. But next to nothing is still more than nothing, and there are billions of unemployed who long ago spent their very last penny. So the people starve, and the crops are left to rot in their silos.
Eventually this is a recipe for social unrest. That could end in political reform to give the starving masses at least enough to not be starving any more, or it could end in violent uprising, or it could end in a police state established to quell that violent uprising.