Back in Paleolithic times, people rarely traded with each other. This was because they were more concerned about plants, animals, and resources nearby.
Look! Another trader! Maybe he will want to trade!
Back in Neolithic times, when people started to become more skilled at different crafts, they started to trade to get materials that would give their items more beauty and strength. Traders got the job of traveling to trade materials.
Off to Asia from the U.S with this shipment!
Today, we trade different types of materials and items all over the world, through ships, trains, trucks, planes, etc.