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The non-aggression principle (NAP), also called the non-aggression axiom, is a concept in which aggression, defined as initiating or threatening any forceful interference (violating or breaching conduct) against either an individual, their propertyWithin the context of the NAP, property is defined as both personal possessions and
private property Private property is a legal designation for the ownership of property by non-governmental legal entities. Private property is distinguishable from public property and personal property, which is owned by a state entity, and from collective or ...
.
or against promises (contracts) for which the aggressor is liable and in which the individual is a counterparty, is inherently wrong. There is no single or universal interpretation or definition of the NAP, with different definitions varying in regards to how to treat intellectual property, force, abortion, and other topics. The non-aggression principle is considered by some to be an essential idea in
libertarianism Libertarianism (from french: libertaire, "libertarian"; from la, libertas, "freedom") is a political philosophy that upholds liberty as a core value. Libertarians seek to maximize autonomy and political freedom, and minimize the state's en ...
,
anarcho-capitalism Anarcho-capitalism (or, colloquially, ancap) is an anti-statist, libertarian, and anti-political philosophy and economic theory that seeks to abolish centralized states in favor of stateless societies with systems of private property enforce ...
or minarchism.


Justifications

The principle has been derived by various philosophical approaches, including: *
Argumentation ethics Hans-Hermann Hoppe (; ; born 2 September 1949) is a German-American economist of the Austrian School, philosopher and political theorist. He is Professor Emeritus of Economics at the University of Nevada, Las Vegas (UNLV), Senior Fellow of t ...
: some modern right-libertarian thinkers ground the non-aggression principle by an appeal to the necessary praxeological presuppositions of any ethical discourse, an argument pioneered by anarcho-capitalist scholar Hans Hermann Hoppe. They claim that the act of arguing for the initiation of aggression, as defined by the non-aggression principle, is contradictory. Among its advocates are Stephan Kinsella and Murray Rothbard. * Consequentialism: some advocates base the non-aggression principle on rule utilitarianism or rule egoism. These approaches hold that though violations of the non-aggression principle cannot be claimed to be objectively immoral, adherence to it almost always leads to the best possible results, and so it should be accepted as a moral rule. These scholars include David D. Friedman, Ludwig von Mises, and Friedrich Hayek. * Objectivism:
Ayn Rand Alice O'Connor (born Alisa Zinovyevna Rosenbaum;, . Most sources transliterate her given name as either ''Alisa'' or ''Alissa''. , 1905 – March 6, 1982), better known by her pen name Ayn Rand (), was a Russian-born American writer and p ...
rejected natural or inborn rights theories as well as supernatural claims and instead proposed a philosophy based on "observable reality" along with a corresponding ethics based on the "factual requirements" of human life in a social context. She stressed that the political principle of non-aggression is not a primary and that it only has validity as a consequence of a more fundamental philosophy. For this reason, many of her conclusions differ from others who hold the NAP as an axiom or arrived at it differently. She proposed that man survives by identifying and using concepts in his rational mind since "no sensations, percepts, urges or instincts can do it; only a mind can". She wrote, "since reason is man's basic means of survival, that which is proper to the life of a rational being is the good; that which negates, opposes or destroys it .e. initiatory force or fraudis the evil." *
Estoppel Estoppel is a judicial device in common law legal systems whereby a court may prevent or "estop" a person from making assertions or from going back on his or her word; the person being sanctioned is "estopped". Estoppel may prevent someone from ...
: Stephan Kinsella believes that the legal concept of estoppel implies and justifies the non-aggression principle.


Definitional issues


Abortion

Both libertarian supporters and opponents of abortion rights justify their position on NAP grounds. One question to determine whether or not abortion is consistent with the NAP is at what stage of development a fertilized human egg cell can be considered a
human being Humans (''Homo sapiens'') are the most abundant and widespread species of primate, characterized by bipedality, bipedalism and exceptional cognitive skills due to a large and complex Human brain, brain. This has enabled the development of ad ...
with the status and rights attributed to personhood. Some supporters of the NAP argue this occurs at the moment of conception while others argue that since the fetus lacks
sentience Sentience is the capacity to experience feelings and sensations. The word was first coined by philosophers in the 1630s for the concept of an ability to feel, derived from Latin '':wikt:sentientem, sentientem'' (a feeling), to distinguish it fro ...
until a certain stage of development, it does not qualify as a human being and may be considered property of the mother. On the other hand, opponents of abortion state that sentience is not a qualifying factor. They refer to the animal rights discussion and point out the
argument from marginal cases The argument from marginal cases (also known as the argument from species overlap) is a philosophical argument within animal rights theory regarding the moral status of non-human animals. Its proponents hold that if human infants, senile people, th ...
that concludes the NAP also applies to non-sentient (i.e. mentally handicapped) humans. Another question is whether an unwelcome fetus should be considered to be an unauthorized trespasser in its mother's body. The non-aggression principle does not protect trespassers from the owners of the property on which they are trespassing.
Objectivist Objectivism is a philosophical system developed by Russian-American writer and philosopher Ayn Rand. She described it as "the concept of man as a heroic being, with his own happiness as the moral purpose of his life, with productive achievement ...
philosopher Leonard Peikoff has argued that a fetus has no right to life inside the womb because it is not an "independently existing, biologically formed organism, let alone a person". Pro-choice libertarian Murray Rothbard held the same stance, maintaining that abortion is justified at any time during pregnancy if the fetus is no longer welcome inside its mother. Similarly, other pro-choice supporters base their argument on criminal trespass. In that case, they claim that the NAP is not violated when the fetus is forcibly removed, with deadly force if need be, from the mother's body, just as the NAP is not violated when an owner removes from the owner's property an unwanted visitor who is not willing to leave voluntarily. Libertarian theorist Walter Block follows this line of argument with his theory of
evictionism Evictionism is a moral theory advanced by Walter Block and Roy Whitehead on a proposed libertarian view of abortion based on property rights. This theory is built upon the earlier work of philosopher Murray Rothbard who wrote that "no being has a ...
, but he makes a distinction between evicting the fetus prematurely so that it dies and actively killing it. On the other hand, the theory of
departurism Departurism is a pro-life libertarian approach to the abortion controversy developed by American philosopher Sean Parr which argues, contrary to evictionism, that the lethal removal of an unwanted fetus ought to be legally impermissible (except ...
permits only the non-lethal eviction of the trespassing fetus during a normal pregnancy.
Anti-abortion Anti-abortion movements, also self-styled as pro-life or abolitionist movements, are involved in the abortion debate advocating against the practice of abortion and its legality. Many anti-abortion movements began as countermovements in respons ...
libertarians such as Libertarians for Life argue that because the parents were actively involved in creating a new human life and that life has not consented to his or her own existence, that life is in the womb by necessity and no parasitism or trespassing in the form of legal necessity is involved. They state that as the parents are responsible for that life's position, the NAP would be violated when that life is killed with abortive techniques.


Intellectual property rights

The NAP has been defined as applicable to any unauthorized actions towards a person's physical property. Supporters of the NAP disagree on whether it should apply to intellectual property rights as well as physical property rights. Some argue that because intellectual concepts are non- rivalrous, intellectual property rights are unnecessary while others argue that intellectual property rights are as valid and important as physical ones.


Force and interventions

Although the NAP is meant to guarantee an individual's sovereignty, libertarians greatly differ on the conditions under which the NAP applies. Especially unsolicited intervention by others, either to prevent society from being harmed by the individual's actions or to prevent an incompetent individual from being harmed by his own actions or inactions, is an important issue. The debate centers on topics such as the
age of consent The age of consent is the age at which a person is considered to be legally competent to consent to sexual acts. Consequently, an adult who engages in sexual activity with a person younger than the age of consent is unable to legally claim ...
for children, intervention counseling (i.e. for addicted persons, or in case of domestic violence),
involuntary commitment Involuntary commitment, civil commitment, or involuntary hospitalization/hospitalisation is a legal process through which an individual who is deemed by a qualified agent to have symptoms of severe mental disorder is detained in a psychiatric hos ...
and involuntary treatment with regards to
mental illness A mental disorder, also referred to as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitti ...
,
medical assistance A medical assistant, also known as a "clinical assistant" or healthcare assistant in the USA is an allied health professional who supports the work of physicians, nurse practitioners, physician assistants and other health professionals, usually ...
(i.e. prolonged life support vs euthanasia in general and for the senile or comatose in particular), human organ trade, state paternalism (including economic intervention) and foreign intervention by states. Other discussion topics on whether intervention is in line with the NAP include
nuclear weapons proliferation Nuclear proliferation is the spread of nuclear weapons, fissionable material, and weapons-applicable nuclear technology and information to nations not recognized as " Nuclear Weapon States" by the Treaty on the Non-Proliferation of Nuclear We ...
,
human trafficking Human trafficking is the trade of humans for the purpose of forced labour, sexual slavery, or commercial sexual exploitation for the trafficker or others. This may encompass providing a spouse in the context of forced marriage, or the extrac ...
and immigration. Randian author Ronald Merill states that use of force is subjective, saying: "There's no objective basis for controlling the use of force. Your belief that you're using force to protect yourself is just an opinion; what if it is my opinion that you are violating my rights?"


States

Some libertarians justify the existence of a minimal state on the grounds that
anarcho-capitalism Anarcho-capitalism (or, colloquially, ancap) is an anti-statist, libertarian, and anti-political philosophy and economic theory that seeks to abolish centralized states in favor of stateless societies with systems of private property enforce ...
implies that the non-aggression principle is optional because the enforcement of laws is open to competition. They claim competing law enforcement would always result in war and the rule of the most powerful. Anarcho-capitalists usually respond to this argument that this presumed outcome of what they call "coercive competition" (e.g. private military companies or private defense agencies that enforce local law) is not likely because of the very high cost, in lives and economically, of war. They claim that war drains those involved and leaves non-combatant parties as the most powerful, economically and militarily, ready to take over. Therefore, anarcho-capitalists claim that in practice, and in more advanced societies with large institutions that have a responsibility to protect their vested interests, disputes are most likely to be settled peacefully. Anarcho-capitalists also point out that a state monopoly of law enforcement does not necessarily make NAP present throughout society as
corruption Corruption is a form of dishonesty or a criminal offense which is undertaken by a person or an organization which is entrusted in a position of authority, in order to acquire illicit benefits or abuse power for one's personal gain. Corruption m ...
and corporatism, as well as
lobby group In politics, lobbying, persuasion or interest representation is the act of lawfully attempting to influence the actions, policies, or decisions of government officials, most often legislators or members of regulatory agencies. Lobbying, which ...
clientelism Clientelism or client politics is the exchange of goods and services for political support, often involving an implicit or explicit quid-pro-quo. It is closely related to patronage politics and vote buying. Clientelism involves an asymmetric rel ...
in democracies, favor only certain people or organizations. Anarcho-capitalists aligned with the
Rothbardian Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
philosophy generally contend that the state violates the non-aggression principle by its very nature because, it is argued, governments necessarily use force against those who have not stolen private property, vandalized private property, assaulted anyone, or committed fraud.


Taxation

Some proponents of the NAP see taxes as a violation of NAP, while critics of the NAP argue that because of the free-rider problem in case security is a
public good Public good may refer to: * Public good (economics), an economic good that is both non-excludable and non-rivalrous * The common good, outcomes that are beneficial for all or most members of a community See also * Digital public goods Digital pu ...
, enough funds would not be obtainable by voluntary means to protect individuals from aggression of a greater severity. The latter therefore accept taxation, and consequently a breach of NAP with regard to any free-riders, as long as no more is levied than is necessary to optimise protection of individuals against aggression. Geolibertarians, who following the classical economists and Georgists adhere to the Lockean labor theory of property, argue that land value taxation is fully compatible with the NAP. Anarcho-capitalists argue that the protection of individuals against aggression is self-sustaining like any other valuable service, and that it can be supplied without coercion by the free market much more effectively and efficiently than by a government monopoly."Review of Kosanke's Instead of Politics – Don Stacy"
Libertarian Papers Vol. 3, Art. No. 3 (2011)
Their approach, based on proportionality in justice and damage compensation, argues that full restitution is compatible with both
retributivism Retributive justice is a theory of punishment that when an offender breaks the law, justice requires that they suffer in return, and that the response to a crime is proportional to the offence. As opposed to revenge, retribution—and thus re ...
and a utilitarian degree of deterrence while consistently maintaining NAP in a society. They extend their argument to all public goods and services traditionally funded through taxation, like security offered by dikes.


Support and criticism

Supporters of the NAP often appeal to it in order to argue for the immorality of theft, vandalism,
sexual assault Sexual assault is an act in which one intentionally sexually touches another person without that person's consent, or coerces or physically forces a person to engage in a sexual act against their will. It is a form of sexual violence, which ...
,
assault An assault is the act of committing physical harm or unwanted physical contact upon a person or, in some specific legal definitions, a threat or attempt to commit such an action. It is both a crime and a tort and, therefore, may result in crim ...
, and
fraud In law, fraud is intentional deception to secure unfair or unlawful gain, or to deprive a victim of a legal right. Fraud can violate civil law (e.g., a fraud victim may sue the fraud perpetrator to avoid the fraud or recover monetary compens ...
. Compared to
nonviolence Nonviolence is the personal practice of not causing harm to others under any condition. It may come from the belief that hurting people, animals and/or the environment is unnecessary to achieve an outcome and it may refer to a general philosoph ...
, the non-aggression principle does not preclude violence used in self-defense or defense of others. Many supporters argue that NAP opposes such policies as victimless crime laws, taxation, and military drafts. NAP is the foundation of libertarian philosophy. NAP faces two kinds of criticism: the first holds that the principle is immoral, and the second argues that it is impossible to apply consistently in practice; respectively, consequentialist or deontological criticisms, and inconsistency criticisms. Libertarian academic philosophers have noted the implausible results consistently applying the principle yields: for example, Professor Matt Zwolinski notes that, because pollution necessarily violates the NAP by encroaching (even if slightly) on other people's property, consistently applying the NAP would prohibit driving, starting a fire, and other activities necessary to the maintenance of industrial society. The NAP also faces definitional issues regarding what is understood as forceful interference and property, and under which conditions does it apply.Friedman, Jeffrey (1993). "What's Wrong with Libertarianism". ''Critical Review''. 11 (3). p. 427.Sterba, James P. (October 1994). "From Liberty to Welfare". ''Ethics''. Cambridge, Massachusetts: Blackwell. 105 (1): 237–241.Partridge, Ernest (2004)
"With Liberty and Justice for Some"
In Zimmerman, Michael; Callicott, Baird; Warren, Karen; Klaver, Irene; Clark, John. ''Environmental Philosophy: From Animal Rights to Radical Ecology'' (4th ed.). Pearson. .
The NAP has been criticized as
circular reasoning Circular may refer to: * The shape of a circle * ''Circular'' (album), a 2006 album by Spanish singer Vega * Circular letter (disambiguation) ** Flyer (pamphlet), a form of advertisement * Circular reasoning, a type of logical fallacy * Circular ...
and a rhetorical obfuscation of the coercive nature of right-libertarian property law enforcement because the principle redefines aggression in their own terms.


Moral criticism


Positive rights

Critics argue that the non-aggression principle is not ethical because it opposes the initiation of force even when they would consider the results of such initiation to be morally superior to the alternatives that they have identified. In arguing against the NAP, philosopher Matt Zwolinski has proposed the following scenario: "Suppose that by imposing a very, very small tax on billionaires, I could provide life-saving vaccination for tens of thousands of desperately poor children. Even if we grant that taxation is aggression, and that aggression is generally wrong, is it really so obvious that the relatively minor aggression involved in these examples is wrong, given the tremendous benefit it produces?"


Incompatibility with driving and other civilizational necessities

Zwolinski also notes that the NAP is incompatible with any practice that produces any pollution, because pollution encroaches on the property rights of others. Therefore, the NAP prohibits both driving and starting fires. Citing David D. Friedman, Zwolinski notes that the NAP is unable to place a sensible limitation on risk-creating behavior, arguing:


Innocent people problem

Some critics use the example of the trolley problem to invalidate NAP. In case of the runaway trolley, headed for five victims tied to the track, NAP does not allow a trolley passenger to flip the switch that diverts the trolley to a different track if there is a person tied to that track. That person would have been unharmed if nothing was done, therefore by flipping the switch NAP is violated. Another example often cited by critics is
human shield A human shield is a non-combatant (or a group of non-combatants) who either volunteers or is forced to shield a legitimate military target in order to deter the enemy from attacking it. The use of human shields as a resistance measure was popula ...
s. Some supporters argue that no one initiates force if their only option for self-defense is to use force against a greater number of people as long as they were not responsible for being in the position they are in. Murray Rothbard's and Walter Block's formulations of NAP avoid these objections by either specifying that the NAP applies only to a civilized context (and not "lifeboat situations") or that it applies only to legal rights (as opposed to general morality). Thus a starving man may, in consonance with general morality, break into a hunting cabin and steal food, but nevertheless he is aggressing, i.e. violating the NAP, and (by most rectification theories) should pay compensation. Critics argue that the legal rights approach might allow people who can afford to pay a
sufficiently large In the mathematical areas of number theory and analysis, an infinite sequence or a function is said to eventually have a certain property, if it doesn't have the said property across all its ordered instances, but will after some instances have pas ...
amount of compensation to get away with murder. They point out that local law may vary from proportional compensation to capital punishment to no compensation at all.


Non-physical aggression

Other critics state that the NAP is unethical because it does not provide for the violent prohibition of, and thereby supposedly legitimizes, several forms of aggression that do not involve intrusion on property rights such as verbal
sexual harassment Sexual harassment is a type of harassment involving the use of explicit or implicit sexual overtones, including the unwelcome and inappropriate promises of rewards in exchange for sexual favors. Sexual harassment includes a range of actions fro ...
,
defamation Defamation is the act of communicating to a third party false statements about a person, place or thing that results in damage to its reputation. It can be spoken (slander) or written (libel). It constitutes a tort or a crime. The legal defini ...
,
boycott A boycott is an act of nonviolent, voluntary abstention from a product, person, organization, or country as an expression of protest. It is usually for moral, social, political, or environmental reasons. The purpose of a boycott is to inflict som ...
ing, noninvasive
striking Strike may refer to: People *Strike (surname) Physical confrontation or removal *Strike (attack), attack with an inanimate object or a part of the human body intended to cause harm *Airstrike, military strike by air forces on either a suspected ...
etc. If a victim thus provoked would turn to physical violence, they would be labeled an aggressor according to the NAP. However, supporters of the NAP state that boycotting
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Freedom of Speech," §1 of "Personal Liberty," ch. 6, in "Libertarian Applications to Current Problems," pt. 2 of '' For a New Liberty: The Libertarian Manifesto'' ( Auburn, AL: Ludwig von Mises Institute, 2006; orig. 1973, 1978), pp. 117–18.
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "The Boycott," ch. 18, in "A Theory of Liberty," pt. 2 of '' The Ethics of Liberty'' ( New York, N. Y.: New York University Press, 1998; orig. 1982), pp. 131–32.  ''Cf.'', pp. 77, 79, 240.
and defamation
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Freedom of Speech," §1 of "Personal Liberty," ch. 6, in "Libertarian Applications to Current Problems," pt. 2 of '' For a New Liberty: The Libertarian Manifesto'' ( Auburn, AL: Ludwig von Mises Institute, 2006; orig. 1973, 1978), pp. 116–17.
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Knowledge, True and False," ch. 16, in "A Theory of Liberty," pt. 2 of '' The Ethics of Liberty'' ( New York, N. Y.: New York University Press, 1998; orig. 1982), pp. 121–22, 126–28.
both constitute
freedoms of speech Freedom of speech is a principle that supports the freedom of an individual or a community to articulate their opinions and ideas without fear of retaliation, censorship, or legal sanction. The right to freedom of expression has been recogni ...
and that boycotting, noninvasive striking
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Anti-Strike Laws," §4 of "Involuntary Servitude," ch. 5, in "Libertarian Applications to Current Problems," pt. 2 of '' For a New Liberty: The Libertarian Manifesto'' ( Auburn, AL: Ludwig von Mises Institute, 2006; orig. 1973, 1978), pp. 102–04.  ''Cf.'', pp. 93, 118.  ''Cf.'', '' The Ethics of Liberty'', pp. 77, 132.
and noninvasive discrimination
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Street Rules," §2 of "The Public Sector, II: Streets and Roads," ch. 11, in "Libertarian Applications to Current Problems," pt. 2 of '' For a New Liberty: The Libertarian Manifesto'' ( Auburn, AL: Ludwig von Mises Institute, 2006; orig. 1973, 1978), pp. 255–56.  ''Cf.'', pp. 103, 128.
all constitute freedoms of association and that both freedoms of association and of speech are nonaggressive. Supporters also point out that prohibiting physical retaliation against an action is not itself condonement of said action,
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, in "Natural Law and Natural Rights," ch. 4, in "Introduction: Natural Law," pt. 1 of '' The Ethics of Liberty'' (
New York, N. Y. New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...
: New York University Press, 1998; orig. 1982), p. 24. ''Cf.'', pp. 25, 77, 79, 98 (note 2), 100–01, 107, 121, 124 (note 2), 127, 131–33, 136, 138, 142, 146, 151–53, 173–74, 220, 222.
and that generally there are other, nonphysical means by which one can combat social ills (e.g., discrimination) that do not violate the NAP. Some supporters also state that while most of the time individuals choose voluntarily to engage in situations that may cause some degree of mental battering, this mental battering begins to constitute unauthorized physical overload of the senses (i.e. eardrum and retina) when it cannot be avoided and that the NAP at that point does apply. Many supporters consider verbal and written threats of imminent physical violence sufficient justification for a defensive response in a physical manner.
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Self-Defense," ch. 12, in "A Theory of Liberty," pt. 2 of '' The Ethics of Liberty'' (
New York, N. Y. New York, often called New York City or NYC, is the List of United States cities by population, most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the L ...
: New York University Press, 1998; orig. 1982), pp. 77–78, 80. ''Cf.'', '' For a New Liberty'', p. 27.
Linda & Morris Tannehill, '' The Market for Liberty'' ( San Francisco: Fox & Wilkes, October 1993; orig. March 1970), pp. 4, 10.  ''Cf.'', pp. 77, 80. Those threats would then constitute a legitimate limit to permissible speech. Because freedom of association entails the right of owners to choose who is permitted to enter or remain on their premises, legitimate property owners may also impose limitation on speech. The owner of a theatre wishing to avoid a stampede may prohibit those on her property from calling 'fire!' without just cause.
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Property Rights and "Human Rights"," §5 of "Property and Exchange," ch. 2, in "The Libertarian Creed," pt. 1 of '' For a New Liberty: The Libertarian Manifesto'' ( Auburn, AL: Ludwig von Mises Institute, 2006; orig. 1973, 1978), pp. 52–53.  ''Cf.'', pp. 85–86, 115.
However, the owner of a bank may not prohibit anyone from urging the general public to a
bank run A bank run or run on the bank occurs when many clients withdraw their money from a bank, because they believe the bank may cease to function in the near future. In other words, it is when, in a fractional-reserve banking system (where banks no ...
, except insofar as this occurs on the property of said owner. In a 1948 interview with Donald H. Kirkley for the Library of Congress, H. L. Mencken, a writer who influenced many libertarians, puts an ethical limit on the freedom of speech: Supporters also consider physical threats of imminent physical violence (e.g. pointing a firearm at innocent people, or stocking up nuclear weapons that cannot be used discriminately against specific individual aggressors) sufficient justification for a defensive response in a physical manner. Those threats would then constitute a legitimate limit to permissible action.
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "Self-Defense," ch. 12, in "A Theory of Liberty," pt. 2 of '' The Ethics of Liberty'' ( New York, N. Y.: New York University Press, 1998; orig. 1982), pp. 77–78, 80.  ''Cf.'', pp. 81–82, 189–91, 194.
Murray N. Rothbard Murray Newton Rothbard (; March 2, 1926 – January 7, 1995) was an American economist of the Austrian School, economic historian, political theorist, and activist. Rothbard was a central figure in the 20th-century American libertarian m ...
, "The Nonaggression Axiom," §1 of "Property and Exchange," ch. 2, in "The Libertarian Creed," pt. 1 of '' For a New Liberty: The Libertarian Manifesto'' ( Auburn, AL: Ludwig von Mises Institute, 2006; orig. 1973, 1978), p. 27. ''Cf.'', p. 335.


Inconsistency criticisms


Natural resources and environmental pollution

Critics argue it is not possible to uphold NAP when protecting the environment as most pollution can never be traced back to the party that caused it. They therefore claim that only general broad government regulations will be able to protect the environment. Supporters cite the theoretical " tragedy of the commons" and argue that free-market environmentalism will be much more effective in conserving nature. Political theorist Hillel Steiner emphasizes that all things made come from natural resources and that the validity of any rights to those made things depends on the validity of the rights to the natural resources. If land was stolen then anyone buying produce from that land would not be the legitimate owner of the goods. Also, if natural resources cannot be privately owned but are, and always will be, the property of all of mankind then NAP would be violated if such a resource would be used without everybody's consent (see the Lockean proviso and free-market anarchism). Libertarian philosopher Roderick Long suggests that, as natural resources are required not only for the production of goods but for the production of the human body as well, the very concept of
self-ownership Self-ownership, also known as sovereignty of the individual or individual sovereignty, is the concept of property in one's own person, expressed as the moral or natural right of a person to have bodily integrity and be the exclusive controller ...
can only exist if the land itself is privately owned.


Relative rather than absolute concept

Consequentialist libertarian Consequentialist libertarianism, also known as consequentialist liberalism or libertarian consequentialism, is a libertarian political philosophy and position that is supportive of a free market and strong private property rights only on the grou ...
David D. Friedman, who believes that the NAP should be understood as a relative rather than absolute principle, defends his view by using a
Sorites argument A polysyllogism (also called multi-premise syllogism, sorites, climax, or gradatio) is a string of any number of propositions forming together a sequence of syllogisms such that the conclusion of each syllogism, together with the next proposition, ...
. Friedman begins by stating what he considers obvious: a neighbor aiming his flashlight at someone's property is not aggression, or if it is, it is only aggression in a trivial technical sense. However, aiming at the same property with a gigawatt laser is certainly aggression by any reasonable definition. Yet both flashlight and laser shine photons onto the property, so there must be some cutoff point of how many photons one is permitted to shine upon a property before it is considered aggression. However, the cutoff point cannot be found by deduction alone because of the
Sorites paradox The sorites paradox (; sometimes known as the paradox of the heap) is a paradox that results from vague predicates. A typical formulation involves a heap of sand, from which grains are removed individually. With the assumption that removing a sing ...
, so the non-aggression principle is necessarily ambiguous. Friedman points out the difficulty of undertaking any activity that poses a certain amount of risk to third parties (e.g. flying) if the permission of thousands of people that might be affected by the activity is required.


See also

*
Ahimsa Ahimsa (, IAST: ''ahiṃsā'', ) is the ancient Indian principle of nonviolence which applies to all living beings. It is a key virtue in most Indian religions: Jainism, Buddhism, and Hinduism.Bajpai, Shiva (2011). The History of India ...
* Harm principle * Law of equal liberty *
Libertarian pledge The Libertarian Party (LP) is a Political parties in the United States, political party in the United States that promotes civil liberties, non-interventionism, ''laissez-faire'' capitalism, and Limited government, limiting the size and scope ...
* Libertarian theories of law * Negative liberty *
Nonviolent resistance Nonviolent resistance (NVR), or nonviolent action, sometimes called civil resistance, is the practice of achieving goals such as social change through symbolic protests, civil disobedience, economic or political noncooperation, satyagraha, cons ...
* ''
Primum non nocere ' () is a Latin phrase that means "first, do no harm". The phrase is sometimes recorded as '. Non-maleficence, which is derived from the maxim, is one of the principal precepts of bioethics that all students in healthcare are taught in school a ...
'' * Wiccan Rede * Pacifism * Silver Rule * Taxation is theft * Victimless crime * Voluntaryism


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References


External links


The Non-Aggression Axiom of Libertarianism
by Walter Block at LewRockwell.com.
The Philosophy of Liberty
an animated production which derives a
libertarian Libertarianism (from french: libertaire, "libertarian"; from la, libertas, "freedom") is a political philosophy that upholds liberty as a core value. Libertarians seek to maximize autonomy and political freedom, and minimize the state's e ...
philosophy from the principle of
self-ownership Self-ownership, also known as sovereignty of the individual or individual sovereignty, is the concept of property in one's own person, expressed as the moral or natural right of a person to have bodily integrity and be the exclusive controller ...
. Central to this is the non-aggression principle.
Antiwar.com
a website devoted to opposing aggressive war, imperialism and assaults on freedom associated with both. The editors describe their political view as libertarian.
''Zero Aggression Project''
a website devoted to teaching the concepts of the zero aggression principle with easy to use Heuristics and a project of DownsizeDC.org {{DEFAULTSORT:Non-Aggression Principle Anarcho-capitalism Ethical principles Libertarian terms Libertarianism in the United States Social concepts