and capitalism". According to Stephen Metcalf, Nozick expressed serious misgivings about capitalism, going so far as to reject much of the foundations of the theory on the grounds that personal freedom can sometimes only be fully actualized via a collectivist politics and that wealth is at times justly redistributed via taxation to protect the freedom of the many from the potential tyranny of an overly selfish and powerful few. Nozick suggested that citizens who are opposed to wealth redistribution which fund programs they object to should be able to opt-out by supporting alternative government-approved charities with an added 5% surcharge. Nonetheless, Nozick did not stop from self-identifying as a libertarian in a broad sense and Julian Sanchez has argued that his views simply became more nuanced. Non-aggression principle The non-aggression principle (NAP) is often described as the foundation of several present-day libertarian philosophies, including right-libertarianism. The NAP is a moral stance which forbids actions that are inconsistent with capitalist private property and property rights. It defines aggression and initiation of force as violation of these rights. The NAP and property rights are closely linked since what constitutes aggression depends on what it is considered to be one's property. The principle has been used rhetorically to oppose policies such as military drafts, taxation and victimless crime laws. Property rights While there is debate on whether right-libertarianism and left-libertarianism or socialist libertarianism "represent distinct ideologies as opposed to variations on a theme", right-libertarianism is most in favor of capitalist private property and property rights. Right-libertarians maintain that unowned natural resources "may be appropriated by the first person who discovers them, mixes his labor with them, or merely claims them—without the consent of others, and with little or no payment to them". This contrasts with left-libertarianism in which "unappropriated natural resources belong to everyone in some egalitarian manner". Right-libertarians believe that natural resources are originally unowned and therefore private parties may appropriate them at will without the consent of, or owing to, others (e.g. a land value tax). Right-libertarians are also referred to as propertarians because they hold that societies in which private property rights are enforced are the only ones that are both ethical and lead to the best possible outcomes. They generally support free-market capitalism and are not opposed to any concentrations of economic power, provided it occurs through non-coercive means. State There is a debate amongst right-libertarians as to whether