I know what you mean, but this function applies to all currencies, FX trades etc.
What I'm saying is that a fixed supply currency can never create economic growth without taking away from another part of the economy.
Simple; you have 100 BTC. Your city requires 25 baseline BTC to operate. So you have 75. Then another 50 is required to upgrade and maintain existing infrastructure. Leaving 25. This 25 is used to pay city workers and services leaving zero available to build new condo's or stadiums or new rail or roads.
Historically, this has been the downfall of entire empires.