Many evolutionary biologists argue that humans developed language for economic reasons. ❷ We needed to trade, and we needed to establish trust in order to trade. ❸ Language is very handy when you are trying to conduct business with someone. ❹ Two early humans could not only agree to trade three wooden bowls for six bunches of bananas but establish rules as well. ❺ What wood was used for the bowls? ❻ Where did you get the bananas? ❼ That business deal would have been nearly impossible using only gestures and confusing noises, and carrying it out according to terms agreed upon creates a bond of trust. ❽ Language allows us to be specific, and this is where conversation plays a key role.