Most of our growth was population growth assuming the country in question was able to overcome structural problems that keep developing countries poor. If every human couple has three children growth is infinite, if you count economic activity of the offspring as economic demand of the parent then suddenly human wants and needs are infinite.

Isn't it strange that we are massaging everything to fit the axioms which are starting to sound more and more like religious beliefs and anyone who is making inconvenient statements is called a heretic?

If you tell the longtermists about the population shrinking then their galaxy conquest plans no longer become the obvious conclusion of humanity but rather just a preferred vision of the future for a bunch of people who want to elevate themselves.