> every single one of those cost growth curves is a close match for the early part of the exponential growth curves The early part of a logistic growth curve (

> every single one of those cost growth curves is a close match for the early part of the exponential growth curves The early part of a logistic growth curve (https://en.wikipedia.org/wiki/Logistic_function https://en.wikipedia.org/wiki/Logistic_function) also looks exponential.