How does trade bring humanity together?

All of humanity is a huge consumer. And it is trade that helps a person to consume his needs. When a person starts selling a product, and another one buys it, then a deal arises between people. It is this deal that brings people together. There is an exchange upon purchase.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.