First of all, I am not an expert on matters on different economic systems, but in my normal social intercourse with my friends we discussed matters like that. ↗
It is just because civilization is ever evolving, changing, and becoming more complicated, that experts find it so difficult to define it in explicit terms. ↗
Despite a decade of criticism and budget cuts, the specialised UN agencies have far more expertise and hands-on experience than any other organisations in the world. ↗