Diffusion of Innovations is an established corpus of knowledge. Including, of course, common causes of variation in speeds of adoption. https://en.m.wikipedia.

Diffusion of Innovations is an established corpus of knowledge. Including, of course, common causes of variation in speeds of adoption. https://en.m.wikipedia.org/wiki/Diffusion_of_innovations https://en.m.wikipedia.org/wiki/Diffusion_of_innovations