Does anyone know when the trading and barter system began to be replaced by some form of money exchange for items? Maybe the two systems continued side by side. I'm thinking that there was a lot of barter with shipping and trading to far away places. There wouldn't have been a common money system and the accounting may have been too difficult.
Actually not too many years ago, bartering services was common. Someone who was skilled at carpentry might re-do someone's kitchen, and that person might do some landscaping for the carpenter. That way no money was exchanged.