Classical liberal viewpoint
Institutions of economic freedom
Private property rights
According to the free market view, a secure system of private property rights is an essential part of economic freedom. Such systems include two main rights: the right to control and benefit from property and the right to transfer property by voluntary means. These rights offer people the possibility of autonomy and self-determination according to their personal values and goals. Economist Milton Friedman sees property rights as "the most basic of human rights and an essential foundation for other human rights." With property rights protected, people are free to choose the use of their property, earn on it, and transfer it to anyone else, as long as they do it on a voluntary basis and do not resort to force, fraud or theft. In such conditions most people can achieve much greater personal freedom and development than under a regime of government coercion. A secure system of property rights also reduces uncertainty and encourages investments, creating favorable conditions for an economy to be successful. Empirical evidence suggests that countries with strong property rights systems have economic growth rates almost twice as high as those of countries with weak property rights systems, and that a market system with significant private property rights is an essential condition for democracy. According to Hernando de Soto, much of the poverty in the Third World countries is caused by the lack of Western systems of laws and well-defined and universally recognized property rights. De Soto argues that because of the legal barriers poor people in those countries can not utilize their assets to produce more wealth. One thinker to question private property was Pierre-Joseph Proudhon, a socialist and anarchist, who argued that property is both theft and freedom.
Freedom of contract
Freedom of contract is the right to choose one's contracting parties and to trade with them on any terms and conditions one sees fit. Contracts permit individuals to create their own enforceable legal rules, adapted to their unique situations. However, not all contracts need to be enforced by the state. For example, in the United States there is a large number of third-party arbitration tribunals which resolve disputes under private commercial law. Negatively understood, freedom of contract is freedom from government interference and from imposed value judgments of fairness. The notion of "freedom of contract" was given one of its most famous legal expressions in 1875 by Sir George Jessel MR:
[I]f there is one thing more than another public policy requires it is that men of full age and competent understanding shall have the utmost liberty of contracting, and that their contracts when entered into freely and voluntarily shall be held sacred and shall be enforced by courts of justice. Therefore, you have this paramount public policy to consider – that you are not lightly to interfere with this freedom of contract.
The doctrine of freedom of contract received one of its strongest expressions in the US Supreme Court case of 
Critics of the classical view of freedom of contract argue that this freedom is illusory when the bargaining power of the parties is highly unequal, most notably in the case of contracts between employers and workers. As in the case of restrictions on working hours, workers as a group may benefit from legal protections that prevent individuals agreeing to contracts that require long working hours. In its West Coast Hotel Co. v. Parrish decision in 1937, overturning Lochner, the Supreme Court cited an earlier decisions
||The legislature has also recognized the fact, which the experience of legislators in many States has corroborated, that the proprietors of these establishments and their operatives do not stand upon an equality, and that [p. 394] their interests are, to a certain extent, conflicting. The former naturally desire to obtain as much labor as possible from their employees, while the latter are often induced by the fear of discharge to conform to regulations which their judgment, fairly exercised, would pronounce to be detrimental to their health or strength. In other words, the proprietors lay down the rules and the laborers are practically constrained to obey them. In such cases, self-interest is often an unsafe guide, and the legislature may properly interpose its authority.
From this point on, the Lochner view of freedom of contract has been rejected by US courts.
Economic and political freedom
Some free market advocates argue that political and civil liberties have simultaneously expanded with market-based economies, and present empirical evidence to support the claim that economic and political freedoms are linked.
In Capitalism and Freedom (1962), Friedman further developed Friedrich Hayek's argument that economic freedom, while itself an extremely important component of total freedom, is also a necessary condition for political freedom. He commented that centralized control of economic activities was always accompanied with political repression. In his view, voluntary character of all transactions in a free market economy and wide diversity that it permits are fundamental threats to repressive political leaders and greatly diminish power to coerce. Through elimination of centralized control of economic activities, economic power is separated from political power, and the one can serve as counterbalance to the other. Friedman feels that competitive capitalism is especially important to minority groups, since impersonal market forces protect people from discrimination in their economic activities for reasons unrelated to their productivity.
Austrian School economist Ludwig von Mises argued that economic and political freedom were mutually dependent: "The idea that political freedom can be preserved in the absence of economic freedom, and vice versa, is an illusion. Political freedom is the corollary of economic freedom. It is no accident that the age of capitalism became also the age of government by the people."
In The Road to Serfdom, Hayek argued that "Economic control is not merely control of a sector of human life which can be separated from the rest; it is the control of the means for all our ends." Hayek criticized socialist policies as the slippery slope that can lead to totalitarianism.
Gordon Tullock has argued that "the Hayek-Friedman argument" predicted totalitarian governments in much of Western Europe in the late 20th century – which did not occur. He uses the example of Sweden, in which the government at that time controlled 63 percent of GNP, as an example to support his argument that the basic problem with The Road to Serfdom is "that it offered predictions which turned out to be false. The steady advance of government in places such as Sweden has not led to any loss of non-economic freedoms." While criticizing Hayek, Tullock still praises the classical liberal notion of economic freedom, saying, "Arguments for political freedom are strong, as are the arguments for economic freedom. We needn’t make one set of arguments depend on the other."
Indices of economic freedom
The annual surveys Economic Freedom of the World (EFW) and Index of Economic Freedom (IEF) are two indices which attempt to measure the degree of economic freedom in the world's nations. The EFW index, originally developed by Gwartney, Lawson and Block at the Fraser Institute was likely the most used in empirical studies as of 2000. The other major index, which was developed by The Heritage Foundation and The Wall Street Journal appears superior for data work, although as it only goes back to 1995, it is less useful for historical comparisons.
According to the creators of the indices, these rankings correlate strongly with higher average income per person, higher income of the poorest 10%, higher life expectancy, higher literacy, lower infant mortality, higher access to water sources and less corruption. The people living in the top one-fifth of countries enjoy an average income of $23,450 and a growth rate in the 1990s of 2.56 percent per year; in contrast, the bottom one-fifth in the rankings had an average income of just $2,556 and a -0.85 percent growth rate in the 1990s. The poorest 10 percent of the population have an average income of just $728 in the lowest ranked countries compared with over $7,000 in the highest ranked countries. The life expectancy of people living in the highest ranked nations is 20 years longer than for people in the lowest ranked countries.
Higher economic freedom, as measured by both the Heritage and the Fraser indices, correlates strongly with higher self-reported happiness.
Erik Gartzke of the Fraser Institute estimates that countries with a high EFW are significantly less likely to be involved in wars, while his measure of democracy had little or no impact.
The Economic Freedom of the World score for the entire world has grown considerably in recent decades. The average score has increased from 5.17 in 1985 to 6.4 in 2005. Of the nations in 1985, 95 nations increased their score, seven saw a decline, and six were unchanged. Using the 2008 Index of Economic Freedom methodology world economic freedom has increased 2.6 points since 1995.
Members of the World Bank Group also use Index of Economic Freedom as the indicator of investment climate, because it covers more aspects relevant to the private sector in wide number of countries.
The nature of economic freedom is often in dispute.
Robert Lawson, the co-author of EFW, even acknowledges the potential shortcomings of freedom indices: "The purpose of the EFW index is to measure, no doubt imprecisely, the degree of economic freedom that exists." He likens the recent attempts of economists to measure economic freedom to the initial attempts of economists to measure GDP: "They [macroeconomists] were
scientists who sat down to design, as best they could with the tools at hand, a measure of the current economic activity of the nation. Economic activity exists and their job was to measure it. Likewise economic freedom exists. It is a thing. We can define and measure it."
Thus, it follows that some economists, socialists and anarchists contend that the existing indicators of economic freedom are too narrowly defined and should take into account a broader conception of economic freedoms.
Critics of the indices (e.g. Thom Hartmann) also oppose the inclusion of business-related measures like corporate charters and intellectual property protection. John Miller in Dollars & Sense has stated that the indices are "a poor barometer of either freedom more broadly construed or of prosperity." He argues that the high correlation between living standards and economic freedom as measured by IEF is the result of choices made in the construction of the index that guarantee this result. For example, the treatment of a large informal sector (common in poor countries) as an indicator of restrictive government policy, and the use of the change in the ratio of government spending to national income, rather than the level of this ratio. Hartmann argues that these choices cause the social democratic European countries to rank higher than countries where the government share of the economy is small but growing.
Economists Dani Rodrik and Jeffrey Sachs have separately noted that there appears to be little correlation between measured economic freedom and economic growth when the least free countries are disregarded, as indicated by the strong growth of the Chinese economy in recent years. Morris Altman found that there is a relatively large correlation between economic freedom and both per capita income and per capita growth. He argues that this is especially true when it comes to sub-indices relating to property rights and sound money, while he calls into question the importance of sub-indices relating to labor regulation and government size once certain threshold values are passed. John Miller further observes that Hong Kong and Singapore, both only "partially free" according to Freedom House, are leading countries on both economic freedom indices and casts doubt on the claim that measured economic freedom is associated with political freedom. However, according to the Freedom House, "there is a high and statistically significant correlation between the level of political freedom as measured by Freedom House and economic freedom as measured by the Wall Street Journal/Heritage Foundation survey."