Comment by nl

I'm not sure that's what they meant. Read like this:

> the tractor and plow are doing a lot more work than 3 farmers, yet we've got more jobs and grow more food.

it sounds to me like they mean "more job and grow more food" in the same context as "the tractor and plow [that] are doing a lot more work than 3 farmers"

But you could be right in which case I agree with them.