The legal regime that creates and defines private property is the foundation of capitalism and is responsible for enormous inequality—economic and otherwise—in our society. While state law is the primary source of property rights and restrictions, the federal Constitution contains a provision central to the tension between those who seek to reinforce the current property system and those who view the system's reform as a key strategy for creating greater opportunity and equality: the "Takings Clause" of the Fifth Amendment, which proves that "nor shall private property be taken for public use, without just compensation."