It is important to understand that the most important currency is social debt. Doing things for others. In order to get, you have to give.
In essence, money gives us the calories we need to survive. Over time, we became aware that exchange and cooperation increase our chances for survival. Eventually we create tools to facilitate trade. One of these tools is called money.
In some cultures, when you give someone a gift, it's expected that they will pass it on. This seems like a peculiar practice in the West, but in many other societies, a gift has a spirit. If you try to possess the gift, you remove its spirit as a gift.
