  The core of Leibniz's solution to the underachiever problem is straightforward. Leibniz argues that God does not underachieve in creating this world because this world is the best of all possible worlds. Many thinkers have supposed that commitment to the claim that this world is the best of all possible worlds follows straightforwardly from monotheism. Because God is omnipotent and omniscient, nothing can prevent him from creating the best world, and his omnibenevolence obliges him to create the best world. So the created world is the best world.