Traditional economic system is the type of economy system that prevailed in all independent human organization or settlements prior to their contact with the outside world. In Africa, for instance, feudalism and communism predominated before contact with Europeans.

When Facebook opened its desktop site to third-party sellers, it seemed like a win-win for users and businesses. Users would have more options when buying things, while businesses could expand their reach. But in practice, the rollout has been rocky. With this many people using Facebook on mobile devices and...