Libertarianism, political philosophy that takes individual liberty to be the primary political value. It may be understood as a form of liberalism, the political philosophy associated with the English philosophers John Locke and John Stuart Mill, the Scottish economist Adam Smith, and the American statesman Thomas Jefferson. Liberalism seeks to define and justify the legitimate powers of government in terms of certain natural or God-given individual rights. These rights include the rights to life, liberty, private property, freedom of speech and association, freedom of worship, government by consent, equality under the law, and moral autonomy (the pursuit of ones own conception of happiness, or the good life). The purpose of government, according to liberals, is to protect these and other individual rights, and in general liberals have contended that government power should be limited to that which is necessary to accomplish this task. Libertarians are classical liberals who strongly emphasize the individual right to liberty. They contend that the scope and powers of government should be constrained so as to allow each individual as much freedom of action as is consistent with a like freedom for everyone else. Thus, they believe that individuals should be free to behave and to dispose of their property as they see fit, provided that their actions do not infringe on the equal freedom of others.

Liberalism and libertarianism have deep roots in Western thought. A central feature of the religious and intellectual traditions of ancient Israel and ancient Greece was the idea of a higher moral law that applied universally and that constrained the powers of even kings and governments. Christian theologians, including Tertullian in the 2nd and 3rd centuries and St. Thomas Aquinas in the 13th century, stressed the moral worth of the individual and the division of the world into two realms, one of which was the province of God and thus beyond the power of the state to control.

Libertarianism also was influenced by debates within Scholasticism on slavery and private property. Scholastic thinkers such as Aquinas, Francisco de Vitoria, and Bartolom de Las Casas developed the concept of self-mastery (dominium)later called self-propriety, property in ones person, or self-ownershipand showed how it could be the foundation of a system of individual rights (see below Libertarian philosophy). In response to the growth of royal absolutism in early modern Europe, early libertarians, particularly those in the Netherlands and England, defended, developed, and radicalized existing notions of the rule of law, representative assemblies, and the rights of the people. In the mid-16th century, for example, the merchants of Antwerp successfully resisted the attempt by the Holy Roman emperor Charles V to introduce the Inquisition in their city, maintaining that it would contravene their traditional privileges and ruin their prosperity (and hence diminish the emperors tax income). Through the Petition of Right (1628) the English Parliament opposed efforts by King Charles I to impose taxes and compel loans from private citizens, to imprison subjects without due process of law, and to require subjects to quarter the kings soldiers (see petition of right). The first well-developed statement of libertarianism, An Agreement of the People (1647), was produced by the radical republican Leveler movement during the English Civil Wars (164251). Presented to Parliament in 1649, it included the ideas of self-ownership, private property, legal equality, religious toleration, and limited, representative government.

In the late 17th century, liberalism was given a sophisticated philosophical foundation in Lockes theories of natural rights, including the right to private property and to government by consent. In the 18th century, Smiths studies of the economic effects of free markets greatly advanced the liberal theory of spontaneous order, according to which some forms of order in society arise naturally and spontaneously, without central direction, from the independent activities of large numbers of individuals. The theory of spontaneous order is a central feature of libertarian social and economic thinking (see below Spontaneous order).

The American Revolution (177583) was a watershed for liberalism. In the Declaration of Independence (1776), Jefferson enunciated many liberal and libertarian ideas, including the belief in unalienable Rights to Life, Liberty, and the pursuit of Happiness and the belief in the right and duty of citizens to throw off such Government that violates these rights. Indeed, during and after the American Revolution, according to the American historian Bernard Bailyn, the major themes of eighteenth-century libertarianism were brought to realization in written constitutions, bills of rights, and limits on executive and legislative powers, especially the power to wage war. Such values have remained at the core of American political thought ever since.

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During the 19th century, governments based on traditional liberal principles emerged in England and the United States and to a smaller extent in continental Europe. The rise of liberalism resulted in rapid technological development and a general increase in living standards, though large segments of the population remained in poverty, especially in the slums of industrial cities.

In the late 19th and early 20th centuries, many liberals began to worry that persistent inequalities of wealth and the tremendous pace of social change were undermining democracy and threatening other classical liberal values, such as the right to moral autonomy. Fearful of what they considered a new despotism of the wealthy, modern liberals advocated government regulation of markets and major industries, heavier taxation of the rich, the legalization of trade unions, and the introduction of various government-funded social services, such as mandatory accident insurance. Some have regarded the modern liberals embrace of increased government power as a repudiation of the classical liberal belief in limited government, but others have seen it as a reconsideration of the kinds of power required by government to protect the individual rights that liberals believe in.

The new liberalism was exemplified by the English philosophers L.T. Hobhouse and T.H. Green, who argued that democratic governments should aim to advance the general welfare by providing direct services and benefits to citizens. Meanwhile, however, classical liberals such as the English philosopher Herbert Spencer insisted that the welfare of the poor and the middle classes would be best served by free markets and minimal government. In the 20th century, so-called welfare state liberalism, or social democracy, emerged as the dominant form of liberalism, and the term liberalism itself underwent a significant change in definition in English-speaking countries. Particularly after World War II, most self-described liberals no longer supported completely free markets and minimal government, though they continued to champion other individual rights, such as the right to freedom of speech. As liberalism became increasingly associated with government intervention in the economy and social-welfare programs, some classical liberals abandoned the old term and began to call themselves libertarians.

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In response to the rise of totalitarian regimes in Russia, Italy, and Germany in the first half of the 20th century, some economists and political philosophers rediscovered aspects of the classical liberal tradition that were most distinctly individualist. In his seminal essay Economic Calculation in the Socialist Commonwealth (originally in German, 1920), the Austrian-American economist Ludwig von Mises challenged the basic tenets of socialism, arguing that a complex economy requires private property and freedom of exchange in order to solve problems of social and economic coordination. Von Misess work led to extensive studies of the processes by which the uncoordinated activities of numerous individuals can spontaneously generate complex forms of social order in societies where individual rights are well-defined and legally secure.

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 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 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 (fl. 6th century bc), 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.

Despite the historical growth in the scope and powers of government, particularly after World War II, in the early 21st century the political and economic systems of most Western countriesespecially the United Kingdom and the United Statescontinued to be based largely on classical liberal principles. Accordingly, libertarians in those countries tended to focus on smaller deviations from liberal principles, creating the perception among many that their views were radical or extreme. Explicitly libertarian political parties (such as the Libertarian Party in the United States and the Libertarianz Party in New Zealand), where they did exist, garnered little support, even among self-professed libertarians. Most politically active libertarians supported classical liberal parties (such as the Free Democratic Party in Germany or the Flemish Liberals and Democrats in Belgium) or conservative parties (such as the Republican Party in the United States or the Conservative Party in Great Britain); they also backed pressure groups advocating policies such as tax reduction, the privatization of education, and the decriminalization of drugs and other so-called victimless crimes. There were also small but vocal groups of libertarians in Scandinavia, Latin America, India, and China.

The publication in 1974 of Anarchy, State, and Utopia, a sophisticated defense of libertarian principles by the American philosopher Robert Nozick, marked the beginning of an intellectual revival of libertarianism. Libertarian ideas in economics became increasingly influential as libertarian economists were appointed to prominent advisory positions in conservative governments in the United Kingdom and the United States and as some libertarians, such as James M. Buchanan, Milton Friedman, F.A. Hayek, and Vernon L. Smith, were awarded the Nobel Prize for Economics. In 1982 the death of the libertarian novelist and social theorist Ayn Rand prompted a surge of popular interest in her work. Libertarian scholars, activists, and political leaders also played prominent roles in the worldwide campaign against apartheid and in the construction of democratic societies in eastern and central Europe following the collapse of communism there in 198991. In the early 21st century, libertarian ideas informed new research in diverse fields such as history, law, economic development, telecommunications, bioethics, globalization, and social theory.

A long-standing criticism of libertarianism is that it presupposes an unrealistic and undesirable conception of individual identity and of the conditions necessary for human flourishing. Opponents of libertarianism often refer to libertarian individualism as atomistic, arguing that it ignores the role of family, tribe, religious community, and state in forming individual identity and that such groups or institutions are the proper sources of legitimate authority. These critics contend that libertarian ideas of individuality are ahistorical, excessively abstract, and parasitic on unacknowledged forms of group identity and that libertarians ignore the obligations to community and government that accompany the benefits derived from these institutions. In the 19th century, Karl Marx decried liberal individualism, which he took to underlie civil (or bourgeois) society, as a decomposition of man that located mans essence no longer in community but in difference. More recently, the Canadian philosopher Charles Taylor maintained that the libertarian emphasis on the rights of the individual wrongly implies the self-sufficiency of man alone.

Libertarians deny that their views imply anything like atomistic individualism. The recognition and protection of individuality and difference, they contend, does not necessarily entail denying the existence of community or the benefits of living together. Rather, it merely requires that the bonds of community not be imposed on people by force and that individuals (adults, at least) be free to sever their attachments to others and to form new ones with those who choose to associate with them. Community, libertarians believe, is best served by freedom of association, an observation made by the 19th-century French historian of American democracy Alexis de Tocqueville, among others. Thus, for libertarians the central philosophical issue is not individuality versus community but rather consent versus coercion.

Other critics, including some prominent conservatives, have insisted that libertarianism is an amoral philosophy of libertinism in which the law loses its character as a source of moral instruction. The American philosopher Russell Kirk, for example, argued that libertarians bear no authority, temporal or spiritual, and do not venerate ancient beliefs and customs, or the natural world, or [their] country, or the immortal spark in [their] fellow men. Libertarians respond that they do venerate the ancient traditions of liberty and justice. They favour restricting the function of the law to enforcing those traditions, not only because they believe that individuals should be permitted to take moral responsibility for their own choices but also because they believe that law becomes corrupted when it is used as a tool for making men moral. Furthermore, they argue, a degree of humility about the variety of human goals should not be confused with radical moral skepticism or ethical relativism.

Some criticisms of libertarianism concern the social and economic effects of free markets and the libertarian view that all forms of government intervention are unjustified. Critics have alleged, for example, that completely unregulated markets create poverty as well as wealth; that they create significant inequalities in the distribution of wealth and economic power, both within and between countries; that they encourage environmental pollution and the wasteful or destructive use of natural resources; that they are incapable of efficiently or fairly performing some necessary social services, such as health care, education, and policing; and that they tend toward monopoly, which increases inefficiency and compounds the problem of significant inequality of wealth. Libertarians have responded by questioning whether government regulation, which would replace one set of imperfect institutions (private businesses) with another (government agencies), would solve or only worsen these problems. In addition, several libertarian scholars have argued that some of these problems are not caused by free markets but rather result from the failures and inefficiencies of political and legal institutions. Thus, they argue that environmental pollution could be minimized in a free market if property rights were properly defined and secured.

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