Classical liberalism rests on a presumption of libertythat is, on the presumption that the exercise of liberty does not require justification but that all restraints on liberty do. Libertarians have attempted to define the proper extent of individual liberty in terms of the notion of property in ones person, or self-ownership, which entails that each individual is entitled to exclusive control of his choices, his actions, and his body. Because no individual has the right to control the peaceful activities of other self-owning individualse.g., their religious practices, their occupations, or their pastimesno such power can be properly delegated to government. Legitimate governments are therefore severely limited in their authority.

According to the principle that libertarians call the nonaggression axiom, all acts of aggression against the rights of otherswhether committed by individuals or by governmentsare unjust. Indeed, libertarians believe that the primary purpose of government is to protect citizens from the illegitimate use of force. Accordingly, governments may not use force against their own citizens unless doing so is necessary to prevent the illegitimate use of force by one individual or group against another. This prohibition entails that governments may not engage in censorship, military conscription, price controls, confiscation of property, or any other type of intervention that curtails the voluntary and peaceful exercise of an individuals rights.

A fundamental characteristic of libertarian thinking is a deep skepticism of government power. Libertarianism and liberalism both arose in the West, where the division of power between spiritual and temporal rulers had been greater than in most other parts of the world. In the Hebrew Bible (Old Testament), I Samuel 8: 1718, the Jews asked for a king, and God warned them that such a king would take the tenth of your flocks, and you shall be his slaves. And in that day you will cry out because of your king, whom you have chosen for yourselves; but the Lord will not answer you in that day. This admonition reminded Europeans for centuries of the predatory nature of states. The passage was cited by many liberals, including Thomas Paine and Lord Acton, who famously wrote that power tends to corrupt, and absolute power corrupts absolutely. Libertarian skepticism was reinforced by events of the 20th century, when unrestrained government power, among other factors, led to world war, genocide, and massive human rights violations.

Libertarians embrace individualism insofar as they attach supreme value to the rights and freedoms of individuals. Although various theories regarding the origin and justification of individual rights have been proposede.g., that they are given to human beings by God, that they are implied by the very idea of a moral law, and that respecting them produces better consequencesall libertarians agree that individual rights are imprescriptiblei.e., that they are not granted (and thus cannot be legitimately taken away) by governments or by any other human agency. Another aspect of the individualism of libertarians is their belief that the individual, rather than the group or the state, is the basic unit in terms of which a legal order should be understood.

Libertarians hold that some forms of order in society arise naturally and spontaneously from the actions of thousands or millions of individuals. The notion of spontaneous order may seem counterintuitive: it is natural to assume that order exists only because it has been designed by someone (indeed, in the philosophy of religion, the apparent order of the natural universe was traditionally considered proof of the existence of an intelligent designeri.e., God). Libertarians, however, maintain that the most important aspects of human societysuch as language, law, customs, money, and marketsdevelop by themselves, without conscious direction.

An appreciation for spontaneous order can be found in the writings of the ancient Chinese philosopher Lao-tzu (6th century bce), who urged rulers to do nothing because without law or compulsion, men would dwell in harmony. A social science of spontaneous order arose in the 18th century in the work of the French physiocrats and in the writings of the Scottish philosopher David Hume. Both the physiocrats (the term physiocracy means the rule of nature) and Hume studied the natural order of economic and social life and concluded, contrary to the dominant theory of mercantilism, that the directing hand of the prince was not necessary to produce order and prosperity. Hume extended his analysis to the determination of interest rates and even to the emergence of the institutions of law and property. In A Treatise of Human Nature (173940), he argued that the rule concerning the stability of possession is a product of spontaneous ordering processes, because it arises gradually, and acquires force by a slow progression, and by our repeated experience of the inconveniences of transgressing it. He also compared the evolution of the institution of property to the evolution of languages and money.

Smith developed the concept of spontaneous order extensively in both The Theory of Moral Sentiments (1759) and An Inquiry into the Nature and Causes of the Wealth of Nations (1776). He made the idea central to his discussion of social cooperation, arguing that the division of labour did not arise from human wisdom but was the necessary, though very slow and gradual, consequence of a certain propensity in human nature which has in view no such extensive utility: the propensity to truck, barter, and exchange one thing for another. In Common Sense (1776), Paine combined the theory of spontaneous order with a theory of justice based on natural rights, maintaining that the great part of that order which reigns among mankind is not the effect of government.

According to libertarians, free markets are among the most important (but not the only) examples of spontaneous order. They argue that individuals need to produce and trade in order to survive and flourish and that free markets are essential to the creation of wealth. Libertarians also maintain that self-help, mutual aid, charity, and economic growth do more to alleviate poverty than government social-welfare programs. Finally, they contend that, if the libertarian tradition often seems to stress private property and free markets at the expense of other principles, that is largely because these institutions were under attack for much of the 20th century by modern liberals, social democrats, fascists, and adherents of other leftist, nationalist, or socialist ideologies.

Libertarians consider the rule of law to be a crucial underpinning of a free society. In its simplest form, this principle means that individuals should be governed by generally applicable and publicly known laws and not by the arbitrary decisions of kings, presidents, or bureaucrats. Such laws should protect the freedom of all individuals to pursue happiness in their own ways and should not aim at any particular result or outcome.

Although most libertarians believe that some form of government is essential for protecting liberty, they also maintain that government is an inherently dangerous institution whose power must be strictly circumscribed. Thus, libertarians advocate limiting and dividing government power through a written constitution and a system of checks and balances. Indeed, libertarians often claim that the greater freedom and prosperity of European society (in comparison with other parts of the world) in the early modern era was the result of the fragmentation of power, both between church and state and among the continents many different kingdoms, principalities, and city-states. Some American libertarians, such as Lysander Spooner and Murray Rothbard, have opposed all forms of government. Rothbard called his doctrine anarcho-capitalism to distinguish it from the views of anarchists who oppose private property. Even those who describe themselves as anarchist libertarians, however, believe in a system of law and law enforcement to protect individual rights.

Much political analysis deals with conflict and conflict resolution. Libertarians hold that there is a natural harmony of interests among peaceful, productive individuals in a just society. Citing David Ricardos theory of comparative advantagewhich states that individuals in all countries benefit when each countrys citizens specialize in producing that which they can produce more efficiently than the citizens of other countrieslibertarians claim that, over time, all individuals prosper from the operation of a free market, and conflict is thus not a necessary or inevitable part of a social order. When governments begin to distribute rewards on the basis of political pressure, however, individuals and groups will engage in wasteful and even violent conflict to gain benefits at the expense of others. Thus, libertarians maintain that minimal government is a key to the minimization of social conflict.

In international affairs, libertarians emphasize the value of peace. That may seem unexceptional, since most (though not all) modern thinkers have claimed allegiance to peace as a value. Historically, however, many rulers have seen little benefit to peace and have embarked upon sometimes long and destructive wars. Libertarians contend that war is inherently calamitous, bringing widespread death and destruction, disrupting family and economic life, and placing more power in the hands of ruling classes. Defensive or retaliatory violence may be justified, but, according to libertarians, violence is not valuable in itself, nor does it produce any additional benefits beyond the defense of life and liberty.

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Libertarianism - Libertarian philosophy | Britannica