Economeeeooo!
Let's pretend we're on an island. There are 20 of us. We only have access to what is on our island, so there are no import worries. We don't have a money system because everyone is just finding a place to live and helping each other when needed. I love carrots but can't grow them for squat. You hate carrots but are a world class carrot farmer, so I offer to trade you some of my crops for your carrots. After awhile, we figure out that we have enough of each other's produce, so we start offering other things in return for what we need. I offer you a day's labor in exchange for help building a bridge between my bedroom treehouse and my bathroom treehouse. This bridge is especially necessary in the mornings. We can continue on like this forever without ever knowing we were supposed to be storing up stuff we don't need. One day you come to me and say, "Can you help me build a radio out of a coconut? I'll give you some veggies!" I don'