But on the other hand, the price of oil at a lower price as a result, other artificial rubber prices as a substitute (Substitute Good) are cheap. Artificial rubber or synthetic rubber polymer is a kind of extension that has elastic properties very well so it is not like plastics and artificial rubber, which scientist can change the structure of artificial rubber, similar to nature and have similar properties. Currently, artificial rubber is becoming a major competitor with natural rubber in the tire industry. When artificial rubber prices dropped as a result, the price of natural rubber with even lower as economic growth theory of Adam Smith, who said the economic system in mechanical with hands that are not see. Invisible hands or market forces will cause the maximum efficiency in the allocation of social resources.