Value is subjective. It's not from nothing. It's from human action. In an oversimplification, when Peter decides to do business with Paul and Paul is intereste

Value is subjective. It's not from nothing. It's from human action. In an oversimplification, when Peter decides to do business with Paul and Paul is interested in taking his business it's because both believe they'll be better off after that. Now you could [prematurely] argue that there might be externalities and so on, but you must recognize that that action of trading in itself can be seen as something that is going to increase the overall wealth of both as they'll be more satisfied after the fact (assuming everything goes well).