The idea that humans can build economies by trading rests on the assumption that anyone with a skill can create something that others will want to buy.
It\’s based upon comparative advantage. The idea that even if you don\’t have a skill there\’s still something you can create that others wish to buy.
Even if everyone else is better at doing everything better than you are, there\’s still a place in a trading economy for you, still something you can do that others will value and thus buy. That something being whatever it is that you are least bad at.