Trade deals with transactions for goods and services. Trade has historically been one of the chief ways in which individuals have interacted with each other. Trade is one of the main ways that countries interact with each other, as well as individuals interact with each other.
What were the first local currency systems in history we have detailed information on? I dont think it was gold/silver or other hard to produce materials. Probably these became more important ...
Probably this happened several times and maybe even failed and broke up in different regions. What hints and proofs do we have of the earliest succesful intercontinental trade relations? I assume ...