The welfare of a country can scarcely be inferred from a measure of national income.” – Simon Kuznets

Is he right? 

Demand for the labor of horses today is less than 100 yrs ago. That was peak horse.  After that there was no economic incentive to keep the horse population of America from declining sharply. At the margin, the horse was not worth its feed and care.

How many people today want to pay the “minimum”, or subsistence, wage for a horse, rather than buy a car, or a tractor, or take the subway, train, or a plane? Not enough to employ even a tenth of one percent of the horses we had a hundred years ago.

The robotics of that era were stupid machines, they became so good at almost everything a horse was employed to do that the demand curve shifted inward. Supply decreased by over 99% to keep the market wage above the subsistence level. 

In a marginal-cost pricing world, humans are no longer the only source of cybernetic control mechanisms, it can now be substituted for robotics. What is Peak Human?

The end?