I think this is just a sigmoid function, but mirrored over the y-axis. If you extended it farther into the past, it would certainly flatten out just below 100%. So I think it’s just another example of how specific technologies are adopted in sigmoid curves, except in reverse, because people are dis-adopting manual farming.
(And I think the question of why tech grows in sigmoid curves is because that’s the solution to the differential equation that models the fundamental dynamics of “grows proportional to position, up to a carrying capacity”.)
I think this is just a sigmoid function, but mirrored over the y-axis. If you extended it farther into the past, it would certainly flatten out just below 100%. So I think it’s just another example of how specific technologies are adopted in sigmoid curves, except in reverse, because people are dis-adopting manual farming.
(And I think the question of why tech grows in sigmoid curves is because that’s the solution to the differential equation that models the fundamental dynamics of “grows proportional to position, up to a carrying capacity”.)