> Is there some type of underlying assumption that goes like this: "more people ==> more people participating in the market ==> more consumers for your product"

> Is there some type of underlying assumption that goes like this: "more people ==> more people participating in the market ==> more consumers for your product"? No, the theory (promoted by Oded Galor, now becoming mainstream) is:- More people ==> more ideas ==> more new technologies that dramatically improve productivity, and therefore the material wellbeing of families, such as electricity or the Germ Theory of disease. Or maybe digital packet radio (wi-fi, cellphones, bluetooth), or computer vision + lithium batteries + ambulatory robots. 1. https://en.wikipedia.org/wiki/Oded_Galor https://en.wikipedia.org/wiki/Oded_Galor