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Unfair competition in a sense means that the competitors compete on unequal terms, because favorable or disadvantageous conditions are applied to some competitors but not to others; or that the actions of some competitors actively harm the position of others with respect to their ability to compete on equal and fair terms. It contrasts with fair competition, in which the same rules and conditions are applied to all participants, and the competitive action of some does not harm the ability of others to compete. Often, unfair competition means that the gains of some participants are conditional on the losses of others, when the gains are made in ways which are illegitimate or unjust.
Principles of fair competition
To an important extent, the principles of fair competition in the business world are defined by law, and therefore unfair competition may well be unlawful or criminal. But because the forms of competition can change continually and new forms of competition may arise, competition may be unfair, but not illegal, at least not until a legal rule is explicitly made to prohibit it. The exact meaning of unfair advantage or harm caused in business competition may be vague or in dispute, in particular if different competitors promote different interpretations which suit their own interests. It may be difficult to define what it would mean to compete on equal terms, and the operative terms of competition that exist in reality may be challenged only when a participant is seriously disadvantaged by them. Often "equal terms" is defined as an "equal opportunity" or "equal " to compete.
Unfair competition may occur in games if a participant in some way deviates from the rules of the game, or has privileged access to important information or resources that should in principle be available to all participants in the game, or none of them. Participation in the game normally assumes that participants have an equal ability to compete in relevant respects, or are able to acquire it during the game. In sports, for example, a heavyweight boxer is not usually played against a lightweight boxer, and the secret use of drugs to enhance sports performance is usually prohibited in competitions.
Unfair competition is also on the rise in the aviation sector. Airline companies are increasingly seeking unfair advantage through market-distorting business practices, such as social dumping and “forum shopping” to benefit from light regulation and favorable taxation in countries that serve them as ‘flag of convenience’. Gulf carriers, such as the United Arab Emirates and Qatar, enjoy enormous advantages in terms of income, trade, and value-added taxes or labour laws, where the right to strike does not exist.
Such is the case for economically booming airlines from Asia and the Middle East, which are often state-sponsored or state-owned, with access to cheap infrastructure, capital and fuel. Qatar Airways is 100% owned by the Qatar state via the Qatar Investment Authority; Etihad Airways is 100% owned by the government of Abu Dhabi; and Emirates is wholly owned by the Government of Dubai. As their financial situation lacks transparency, there are no guarantees that the governments are running their companies as ‘private’ entities. From a simple financial perspective, as long as the oil and gas revenues remain in the region, these companies will enjoy a huge ‘war chest’ and access to ‘cheap’ money to finance their further expansion.  In addition, weak social legislation in their countries offers them the competitive advantage of a precarious workforce that cannot count on the respect of the basic standards set by the International Labour Organisation (ILO). At the same time, due to non-transparent accounting standards, tracking how profitable these companies are is almost impossible. 
Unions in Europe have also alerted about airlines arbitrarily relocating their business (i.e. their operating license and Air Operator Certificate) to ‘flags of convenience’ countries, such as Ireland. The aim is to avoid tax and social security contributions for their crews, and/or to benefit from lax safety oversight by the authorities that offer their ‘flag’. The systems runs parallel to the flags of convenience used in the maritime sector.
Sometimes unfair competition is also interpreted to mean that the existence of competition as such is unfair or unjust. The argument is then that there should not be any competition. In this case, the alternative to unfair competition is not fair competition, but no competition or cooperation.
Unfair competition in commercial law refers to a number of areas of law involving acts by one competitor or group of competitors which harm another in the field, and which may give rise to criminal offenses and civil causes of action. The most common actions falling under the banner of unfair competition include:
- Matters pertaining to antitrust law, known in the European Union as competition law. Antitrust violations constituting unfair competition occur when one competitor attempts to force others out of the market (or prevent others from entering the market) through tactics such as predatory pricing or obtaining exclusive purchase rights to raw materials needed to make a competing product.
- Trademark infringement and passing off, which occur when the maker of a product uses a name, logo, or other identifying characteristics to deceive consumers into thinking that they are buying the product of a competitor. In the United States, this form of unfair competition is prohibited under the common law and by state statutes, and governed at the federal level by the Lanham Act.
- Misappropriation of trade secrets, which occurs when one competitor uses espionage, bribery, or outright theft to obtain economically advantageous information in the possession of another. In the United States, this type of activity is forbidden by the Uniform Trade Secrets Act and the Economic Espionage Act of 1996.
- Trade libel, the spreading of false information about the quality or characteristics of a competitor's products, is prohibited at common law.
- Tortious interference, which occurs when one competitor convinces a party having a relationship with another competitor to breach a contract with, or duty to, the other competitor is also prohibited at common law.
Various unfair business practices such as fraud, misrepresentation, and unconscionable contracts may be considered unfair competition, if they give one competitor an advantage over others. In the European Union, each member state must regulate unfair business practices in accordance with the principles laid down in the Unfair Commercial Practices Directive, subject to transitional periods. (See also trade regulation law.)
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