touche. But I do believe there are upper limits on desired efficiency in some cases. I'm not a fan of eliminating jobs in all cases. In agriculture I'm not a fan of consolidation and I see the endgame as a few huge companies owning most of the farmland in the US (most of the land) and all those jobs going away. So I guess I'm not against efficiency so much as consolidation of power and ownership. Perhaps one day we'll all have our own robotic gardener, but I doubt it.

The limits of crop production (also) by Prof. Bugbee (don't remember the main author) might be a good starting point for venturing into this question.