The concept of money isn't a hard measurable fact of the universe, but when enough people believe in it, it starts to acquire some pretty consistent attributes across different cultures and times.

It's definitely not a physical science, but it's probably one of the more important social phenomena. (I almost wrote social science, but imo I can't really consider a discipline which isn't based on experimentation to be a science).

So I guess I agree. I would like to see more rigorous methodology.