economic freedom. Anarcho-capitalists seek the elimination of the state in favor of privately funded security services while minarchists defend night-watchman states which maintain only those functions of government necessary to safeguard natural rights, understood in terms of self-ownership or autonomy. Libertarian paternalism is a position advocated in the international bestseller Nudge by two American scholars, namely the economist Richard Thaler and the jurist Cass Sunstein. In the book Thinking, Fast and Slow, Daniel Kahneman provides the brief summary: "Thaler and Sunstein advocate a position of libertarian paternalism, in which the state and other institutions are allowed to Nudge people to make decisions that serve their own long-term interests. The designation of joining a pension plan as the default option is an example of a nudge. It is difficult to argue that anyone's freedom is diminished by being automatically enrolled in the plan, when they merely have to check a box to opt out". Nudge is considered an important piece of literature in behavioral economics. Neo-libertarianism combines "the libertarian's moral commitment to negative liberty with a procedure that selects principles for restricting liberty on the basis of a unanimous agreement in which everyone's particular interests receive a fair hearing". Neo-libertarianism has its roots at least as far back as 1980, when it was first described by the American philosopher James Sterba of the University of Notre Dame. Sterba observed that libertarianism advocates for a government that does no more than protection against force, fraud, theft, enforcement of contracts and other negative liberties as contrasted with positive liberties by Isaiah Berlin. Sterba contrasted this with the older libertarian ideal of a night watchman state, or minarchism. Sterba held that it is "obviously impossible for everyone in society to be guaranteed complete liberty as defined by this ideal: after all, people's actual wants as well as their conceivable wants can come into serious conflict. [...] [I]t is also impossible for everyone in society to be completely free from the interference of other persons". In 2013, Sterna wrote that "I shall show that moral commitment to an ideal of 'negative' liberty, which does not lead to a night-watchman state, but instead requires sufficient government to provide each person in society with the relatively high minimum of liberty that persons using Rawls' decision procedure would select. The political program actually justified by an ideal of negative liberty I shall call Neo-Libertarianism". Libertarian populism combines libertarian