The invisible hand is traditionally understood as a concept in economics, but Robert Nozick argues in "Anarchy, State and Utopia" that substantively the same concept exists in a number of other areas of academic discourse under different names, notably Darwinian natural selection. In turn, Daniel Dennett argues in "Darwin's Dangerous Idea" that this represents a "universal acid" that may be applied to a number of seemingly disparate areas of philosophical inquiry (consciousness and free will in particular), a hypothesis known as Universal Darwinism. However, positing an economy guided by this principle as ideal may amount to Social Darwinism, which is also associated with champions of "laissez-faire" capitalism.