Money and Language

You can imagine a culture as a correlate to self-sufficient economy where everyone could collect information and create works solely by himself without any communication with the others. Actually, however, we exchange commodities through money and views through language.
What is Money?

Why does money have value and circulate, though it does not have value in itself? I will answer this question in terms of the system theory.
What is a Social System?

A social system is not just a gathering of people. It does not consist in the interaction between people either. You can find a mere causal interaction between things.