Any amount of money, as long as it is sufficiently divisible, is capable of facilitating trade within an economy. The idea that somehow money has to increase over time is one of the most non-sensical idea.

"Thus inflation becomes the most important psychological resource of any economic policy whose consequences have to be concealed; and so in this sense it can be called an instrument of unpopular, i.e. of anti-democratic, policy, since by misleading public opinion it makes possible the continued existence of a system of government that would have no hope of the consent of the people if the circumstances were clearly laid before them."

You don't need an economics course when this book exists for free

https://mises.org/library/economics-one-lesson