In this article, we expect to show how contracts have effects regarding third parties and how such effects require some delimitation. In doing so, we identify, describe and analyze several cases in which agreements produce effects to no parties. Therefore, we propose a new system of concepts to explain the effects of contracts, specially the named "absolute effect". In this system, the efecto expansivo has a preeminent place. Finally, we analyze a recent judgment from the Chilean Supreme Court regarding this topic.