Collusion is a deceitful agreement or secret cooperation between two or more parties to limit open
competition
Competition is a rivalry where two or more parties strive for a common goal which cannot be shared: where one's gain is the other's loss (an example of which is a zero-sum game). Competition can arise between entities such as organisms, indi ...
by deceiving, misleading or defrauding others of their legal right. Collusion is not always considered illegal. It can be used to attain objectives forbidden by
law
Law is a set of rules that are created and are enforceable by social or governmental institutions to regulate behavior, with its precise definition a matter of longstanding debate. It has been variously described as a science and as the ar ...
; for example, by defrauding or gaining an unfair market advantage. It is an agreement among firms or individuals to divide a market, set prices, limit production or limit opportunities.
It can involve "unions, wage fixing, kickbacks, or misrepresenting the independence of the relationship between the colluding parties". In legal terms, all acts effected by collusion are considered
void.
Definition
In the study of
economics
Economics () is a behavioral science that studies the Production (economics), production, distribution (economics), distribution, and Consumption (economics), consumption of goods and services.
Economics focuses on the behaviour and interac ...
and market
competition
Competition is a rivalry where two or more parties strive for a common goal which cannot be shared: where one's gain is the other's loss (an example of which is a zero-sum game). Competition can arise between entities such as organisms, indi ...
, collusion takes place within an
industry when rival companies cooperate for their mutual benefit.
Conspiracy
A conspiracy, also known as a plot, ploy, or scheme, is a secret plan or agreement between people (called conspirers or conspirators) for an unlawful or harmful purpose, such as murder, treason, or corruption, especially with a political motivat ...
usually involves an agreement between two or more sellers to take action to suppress competition between sellers in the market. Because competition among sellers can provide consumers with low prices, conspiracy agreements increase the price consumers pay for the goods. Because of this harm to consumers, it is against antitrust laws to fix prices by agreement between producers, so participants must keep it a secret. Collusion often takes place within an
oligopoly
An oligopoly () is a market in which pricing control lies in the hands of a few sellers.
As a result of their significant market power, firms in oligopolistic markets can influence prices through manipulating the supply function. Firms in ...
market structure
Market structure, in economics, depicts how firms are differentiated and categorised based on the types of goods they sell (homogeneous/heterogeneous) and how their operations are affected by external factors and elements. Market structure makes i ...
, where there are few firms and agreements that have significant impacts on the entire market or industry. To differentiate from a
cartel
A cartel is a group of independent market participants who collaborate with each other as well as agreeing not to compete with each other in order to improve their profits and dominate the market. A cartel is an organization formed by producers ...
, collusive agreements between parties may not be explicit; however, the implications of cartels and collusion are the same.
Under competition law, there is an important distinction between direct and covert collusion. Direct collusion generally refers to a group of companies communicating directly with each other to coordinate and monitor their actions, such as cooperating through pricing, market allocation, sales quotas, etc. On the other hand, tacit collusion is where companies coordinate and monitor their behavior without direct communication. This type of collusion is generally not considered illegal, so companies guilty of tacit conspiracy should face no penalties even though their actions would have a similar economic impact as explicit conspiracy.
Collusion results from less competition through mutual understanding, where competitors can independently set prices and market share. A core principle of antitrust policy is that companies must not communicate with each other. Even if conversations between multiple companies are illegal but not enforceable, the incentives to comply with collusive agreements are the same with and without communication. It is against competition law for companies to have explicit conversations in private. If evidence of conversations is accidentally left behind, it will become the most critical and conclusive evidence in antitrust litigation. Even without communication, businesses can coordinate prices by observation, but from a legal standpoint, this tacit handling leaves no evidence. Most companies cooperate through invisible collusion, so whether companies communicate is at the core of antitrust policy.
Collusion is illegal in the
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
,
Canada
Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...
,
Australia
Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...
and most of the
EU due to
antitrust
Competition law is the field of law that promotes or seeks to maintain market competition by regulating anti-competitive conduct by companies. Competition law is implemented through public and private enforcement. It is also known as antitrust l ...
laws, but implicit collusion in the form of
price leadership and tacit understandings still takes place.
Tacit collusion
Covert collusion is known as
tacit collusion
Tacit collusion is a collusion between competitors who do not explicitly exchange information but achieve an agreement about coordination of conduct. There are two types of tacit collusion: concerted action and conscious parallelism. In a concer ...
and is considered legal.
Adam Smith
Adam Smith (baptised 1723 – 17 July 1790) was a Scottish economist and philosopher who was a pioneer in the field of political economy and key figure during the Scottish Enlightenment. Seen by some as the "father of economics"——— or ...
in ''
The Wealth of Nations
''An Inquiry into the Nature and Causes of the Wealth of Nations'', usually referred to by its shortened title ''The Wealth of Nations'', is a book by the Scottish people, Scottish economist and moral philosophy, moral philosopher Adam Smith; ...
'' explains that since the masters (business owners) are fewer in number, it is easier to collude to serve common interests among those involved, such as maintaining low wages, whilst it is difficult for the labour to coordinate to protect their interests due to their vast numbers. Hence, business owners have a bigger advantage over the working class. Nevertheless, according to Adam Smith, the public rarely hears about coordination and collaborations that occur between business owners as it takes place in informal settings.
Some forms of explicit collusion are not considered impactful enough on an individual basis to be considered illegal, such as that which occurred by the social media group
WallStreetBets in the
GameStop short squeeze.
There are many ways that implicit collusion tends to develop:
* The practice of stock analyst conference calls and meetings of industry participants almost necessarily results in tremendous amounts of strategic and price transparency. This allows each firm to see how and why every other firm is pricing their products.
* If the practice of the industry causes more complicated pricing, which is hard for the consumer to understand (such as
risk-based pricing
Risk-based pricing is a methodology adopted by many lenders in the mortgage
A mortgage loan or simply mortgage (), in civil law (legal system), civil law jurisdictions known also as a hypothec loan, is a loan used either by purchasers of re ...
, hidden taxes and fees in the wireless industry, negotiable pricing), this can cause competition based on price to be meaningless (because it would be too complicated to explain to the customer in a short advertisement). This causes industries to have essentially the same prices and compete on advertising and image, something theoretically as damaging to consumers as normal price fixing.
Base model of (price) collusion
For a cartel to work successfully, it must:
* Co-ordinate on the conspiracy agreement (bargaining, explicit or implicit communication).
* Monitor compliance.
* Punish non-compliance.
* Control the expansion of non-cartel supply.
* Avoid inspection by customers and competition authorities.
Regarding stability within the cartel:
* Collusion on high prices means that members have an incentive to deviate.
* In a one-off situation, high prices are not sustainable.
* Requires long-term vision and repeated interactions.
* Companies need to choose between two approaches:
# Insist on collusion agreements (now) and promote cooperation (future).
# Turn away from the alliance (now) and face punishment (future).
* Two factors influence this choice: (1) deviations must be detectable (2) penalties for deviations must have a significant effect.
* Collusion is illegal, contracts between cartels establishing collusion are not protected by law, cannot be enforced by courts, and must have other forms of punishment
Variations
*
*
*
*
*
Suppose this market has
firms. At the collusive price, the firms are symmetric, so they divide the profits equally between the whole industry, represented as
. If and only if the profit of choosing to deviate is greater than that of sticking to collude, i.e.
*
(Companies have no incentive to deviate unilaterally)
* Therefore, the cartel alliance will be stable when
is the case, i.e. the firm has no incentive to deviate unilaterally. So as the number of firms increases, the more difficult it is for The Cartel to maintain stability.
As the number of firms in the market increases, so does the factor of the minimum discount required for collusion to succeed.
According to
neoclassical price-determination theory and
game theory
Game theory is the study of mathematical models of strategic interactions. It has applications in many fields of social science, and is used extensively in economics, logic, systems science and computer science. Initially, game theory addressed ...
, the independence of suppliers forces prices to their minimum, increasing
efficiency
Efficiency is the often measurable ability to avoid making mistakes or wasting materials, energy, efforts, money, and time while performing a task. In a more general sense, it is the ability to do things well, successfully, and without waste.
...
and decreasing the price-determining ability of each firm.
However if all firms collude to increase prices, loss of sales will be minimized, as consumers lack choices at lower prices and must decide between what is available. This benefits the colluding firms, as they generate more sales at the cost of
efficiency
Efficiency is the often measurable ability to avoid making mistakes or wasting materials, energy, efforts, money, and time while performing a task. In a more general sense, it is the ability to do things well, successfully, and without waste.
...
to society.
However, depending on the assumptions made in the theoretical model on the information available to all firms, there are some outcomes, based on Cooperative Game Theory, where collusion may have higher efficiency than if firms did not collude.
One variation of this traditional theory is the theory of
kinked demand. Firms face a kinked demand curve if, when one firm decreases its price, other firms are expected to follow suit to maintain sales. When one firm increases its price, its rivals are unlikely to follow, as they would lose the sales gains they would otherwise receive by holding prices at the previous level. Kinked demand potentially fosters
supra-competitive prices because any one firm would receive a reduced benefit from cutting price, as opposed to the benefits accruing under neoclassical theory and certain game-theoretic models such as
Bertrand competition
Bertrand competition is a model of competition used in economics, named after Joseph Louis François Bertrand (1822–1900). It describes interactions among firms (sellers) that set prices and their customers (buyers) that choose quantities at the ...
.
Collusion may also occur in auction markets, where independent firms coordinate their bids (
bid rigging
Bid rigging is a fraudulent scheme in a procurement action which enables companies to submit non-competitive bids. It can be performed by corrupt officials, by firms in an orchestrated act of collusion, or by officials and firms acting together. ...
).
Deviation

Actions that generate sufficient returns in the future are important to every company, and the probability of continued interaction and the company discount factor must be high enough. The sustainability of cooperation between companies also depends on the threat of punishment, which is also a matter of credibility. Firms that deviate from cooperative pricing will use MMC in each market. MMC increases the loss of deviation, and incremental loss is more important than incremental gain when the firm's objective function is concave. Therefore, the purpose of MMC is to strengthen corporate compliance or inhibit deviant collusion.
[Sorenson. (2007). Credible collusion in multimarket oligopoly. Managerial and Decision Economics, 28(2), 115–128. https://doi.org/10.1002/mde.1314]
The principle of collusion: firms give up deviation gains in the short term in exchange for continued collusion in the future.
* Collusion occurs when companies place more emphasis on future profits
* Collusion is easier to sustain when the choice deviates from the maximum profit to be gained is lower (i.e. the penalty profit is lower) and the penalty is greater.
* Future collusive profits − future punishment profits ≥ current deviation profits − current collusive profits-collusion can sustain.
Scholars in economics and management have tried to identify factors explaining why some firms are more or less likely to be involved in collusion. Some have noted the role of the regulatory environment and the existence of
leniency programs.
Indicators
Some actions that may indicate collusion among competitors are:
* Charging
uniform prices or setting prices that are either too high or too low without justification
* Paying or receiving
kickbacks and agreeing to refer customers only to each other
*
Dividing territories
Dividing territories, market division or horizontal territorial allocation is an agreement by two companies to stay out of each other's way and reduce competition in the agreed-upon territories. The process known as geographic market allocation is ...
and
horizontal territorial allocation
Horizontal may refer to:
*Horizontal plane, in astronomy, geography, geometry and other sciences and contexts
*Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local hori ...
of markets among themselves
*
Tying agreements and anticompetitive
Product bundling
In marketing, product bundling is offering several products or services for sale as one combined product or service package. It is a common feature in many imperfectly competitive product and service markets. Industries engaged in the practice ...
(although, not all product bundling is anticompetitive)
*
Refusal to deal
Though in general, each business may decide with whom they wish to transact, there are some situations when a refusal to deal may be considered an unlawful anti-competitive practice, if it prevents or reduces competition in a market. The unlawfu ...
with certain customers or suppliers and
exclusive dealing with certain customers or suppliers
* Selling products below cost in order to drive out competitors (also known as
dumping)
* Restricting the distribution or supply of products along the supply chain through
vertical restraints
*
Bid rigging
Bid rigging is a fraudulent scheme in a procurement action which enables companies to submit non-competitive bids. It can be performed by corrupt officials, by firms in an orchestrated act of collusion, or by officials and firms acting together. ...
by fixing bids or agreeing not to bid for certain contracts
Examples

* In the example in the picture, the dots in Pc and Q represent competitive industry prices. If firms collude, they can limit production to Q2 and raise the price to P2. Collusion usually involves some form of agreement to seek a higher price.
*When companies discriminate, price collusion is less likely, so the discount factor needed to ensure stability must be increased. In such price competition, competitors use delivered pricing to discriminate in space, but this does not mean that firms using delivered pricing to discriminate cannot collude.
United States
*
Market division and
price-fixing among manufacturers of heavy
electrical
Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwel ...
equipment in the 1960s, including
General Electric
General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston.
Over the year ...
.
* An attempt by
Major League Baseball
Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
owners to
restrict players' salaries in the mid-1980s.
* The sharing of potential contract terms by
NBA
The National Basketball Association (NBA) is a professional basketball league in North America composed of 30 teams (29 in the United States and 1 in Canada). The NBA is one of the major professional sports leagues in the United States and Ca ...
free agents in an effort to help a targeted franchise circumvent the salary cap.
* Price fixing within
food
Food is any substance consumed by an organism for Nutrient, nutritional support. Food is usually of plant, animal, or Fungus, fungal origin and contains essential nutrients such as carbohydrates, fats, protein (nutrient), proteins, vitamins, ...
manufacturers providing cafeteria food to
school
A school is the educational institution (and, in the case of in-person learning, the Educational architecture, building) designed to provide learning environments for the teaching of students, usually under the direction of teachers. Most co ...
s and the
military
A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a d ...
in 1993.
* Market division and output determination of livestock feed additive, called
lysine
Lysine (symbol Lys or K) is an α-amino acid that is a precursor to many proteins. Lysine contains an α-amino group (which is in the protonated form when the lysine is dissolved in water at physiological pH), an α-carboxylic acid group ( ...
, by companies in the US,
Japan
Japan is an island country in East Asia. Located in the Pacific Ocean off the northeast coast of the Asia, Asian mainland, it is bordered on the west by the Sea of Japan and extends from the Sea of Okhotsk in the north to the East China Sea ...
and
South Korea
South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korea, Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and t ...
in 1996,
Archer Daniels Midland
The Archer-Daniels-Midland Company, commonly known as ADM, is an American multinational food processing and commodities trading corporation founded in 1902 and headquartered in Chicago, Chicago, Illinois. The company operates more than 270 p ...
being the most notable of these.
*
Chip dumping in
poker
Poker is a family of Card game#Comparing games, comparing card games in which Card player, players betting (poker), wager over which poker hand, hand is best according to that specific game's rules. It is played worldwide, with varying rules i ...
or any other card game played for money.
*
Ben and Jerry's
Ben is frequently used as a shortened version of the given names Benjamin (name), Benjamin, Benedict (given name), Benedict, Bennett (name), Bennett, Benson (given name), Benson or Ebenezer (given name), Ebenezer, and is also a given name in its ...
and
Häagen-Dazs collusion of products in 2013: Ben and Jerry's makes chunkier flavors with more treats in them, while Häagen-Dazs sticks to smoother flavors.
* Google and Apple against employee poaching, a collusion case in 2015 wherein it was revealed that both companies agreed not to hire employees from one another in order to halt the rise in wages.
* Google has been hit with a series of antitrust lawsuits. In October 2020, the US Department of Justice filed a landmark lawsuit alleging that Google unlawfully boxed out competitors by reaching deals with phone makers, including Apple and Samsung, to be the default search engine on their devices.
Another lawsuit filed by nearly 40 attorneys general on Dec. 17, 2020 alleges that Google’s search results favored its own services over those of more-specialized rivals, a tactic that harmed competitors.
Europe
* The illegal collusion between the giant German automakers BMW, Daimler and Volkswagen, discovered by the
European Commission
The European Commission (EC) is the primary Executive (government), executive arm of the European Union (EU). It operates as a cabinet government, with a number of European Commissioner, members of the Commission (directorial system, informall ...
in 2019, to hinder technological progress in improving the quality of vehicle emissions in order to reduce the cost of production and maximize profits.
Australia
* Japanese shipping company Kawasaki Kisen Kaisha Ltd (
K-Line) were fined $34.5 million by the Federal Court for engaging in criminal cartel conduct. The court found that K-Line participated in a cartel with other shipping companies to fix prices on the transportation of cars, trucks, and buses to Australia between 2009 and 2012. K-Line pleaded guilty in April 2018 and the fine is the largest ever imposed under the Competition and Consumer Act. The court noted that the penalty should serve as a strong warning to businesses that cartel conduct will not be tolerated and will result in serious consequences.
* Between 2004 and 2013, Dr Esra Ogru, the former CEO of an Australian biotech company called Phosphagenics, colluded with two colleagues by using false invoicing and credit card reimbursements to defraud her employer of more than $6.1 million.
Barriers
There can be significant barriers to collusion. In any given industry, these may include:
* The number of firms: As the number of firms in an
industry increases, it is more difficult to successfully organize, collude and communicate.
* Cost and demand differences between firms: If costs vary significantly between firms, it may be impossible to establish a price at which to fix output. Firms generally prefer to produce at a level where marginal cost meets marginal revenue, if one firm can produce at a lower cost, it will prefer to produce more units, and would receive a larger share of profits than its partner in the agreement.
*Asymmetry of information: Colluding firms may not have all the correct information about all other firms, from a quantitative perspective (firms may not know all other firms' cost and demand conditions) or a qualitative perspective (moral hazard). In either situation, firms may not know each others' preferences or actions, and any discrepancy would incentive at least one actor to renege.
* Cheating: There is considerable incentive to cheat on collusion agreements; although lowering prices might trigger
price wars, in the short term the defecting firm may gain considerably. This phenomenon is frequently referred to as "chiseling".
* Potential entry: New firms may enter the industry, establishing a new baseline price and eliminating collusion (though anti-dumping laws and tariffs can prevent foreign companies from entering the market).
* Economic recession: An increase in average total cost or a decrease in revenue provides the incentive to compete with rival firms in order to secure a larger market share and increased demand.
* Anti-collusion legal framework and
collusive lawsuit
A collusive lawsuit, collusive action or friendly suit is a lawsuit in which the parties to the suit have no actual quarrel with one another, but one sues the other to achieve some result desired by both.
Advantages
The law condones this pract ...
. Many countries with anti-collusion laws outlaw side-payments, which are an indication of collusion as firms pay each other to incentivize the continuation of the collusive relationship, may see less collusion as firms will likely prefer situations where profits are distributed towards themselves rather than the combined venture.
* Leniency Programs: Leniency programs are policies that reduce sanctions against collusion if a participant voluntarily confesses their behavior or cooperates with the public authority’s investigation. One example of a leniency program is offering immunity to the first firm who comes clean and gives the government information about collusion. These programs are designed to destabilize collusion and increase deterrence by encouraging firms to report illegal behavior.
Conditions conducive to collusion
There are several industry traits that are thought to be conducive to collusion or empirically associated with collusion. These traits include:
* High market concentration: High market concentration refers to a market with few firms, which makes it easier for these firms to collude and coordinate their actions.
* Homogeneous products: Homogeneous products refer to products that are similar in nature, which makes it easier for firms to agree on prices and reduces the incentive for firms to compete on
product differentiation
In economics and marketing, product differentiation (or simply differentiation) is the process of distinguishing a product or service from others to make it more attractive to a particular target market. This involves differentiating it from c ...
* Stable demand and/or excess capacity: Stable demand and capacity implies predictability and therefore demand and capacity does not fluctuate significantly, which makes it easier for firms to coordinate their actions and maintain a collusive agreement. This can also refer to a situation where firms have more production capacity than is needed to meet demand.
Government intervention
Collusion often occurs within an
oligopoly
An oligopoly () is a market in which pricing control lies in the hands of a few sellers.
As a result of their significant market power, firms in oligopolistic markets can influence prices through manipulating the supply function. Firms in ...
market structure, which is a type of
market failure
In neoclassical economics, market failure is a situation in which the allocation of goods and services by a free market is not Pareto efficient, often leading to a net loss of economic value.Paul Krugman and Robin Wells Krugman, Robin Wells (2006 ...
. Therefore, natural market forces alone may be insufficient to prevent or deter collusion, and government intervention is often necessary.
Fortunately, various forms of government intervention can be taken to reduce collusion among firms and promote natural market competition.
* Fines and imprisonment to companies that collude and their executives who are personally liable.
* Detect collusion by screening markets for suspicious pricing activity and high profitability.
* Provide immunity (leniency) to the first company to confess and provide the government with information about the collusion.
See also
*
Conscious parallelism
*
Corporate crime
*
Competition law
Competition law is the field of law that promotes or seeks to maintain market competition by regulating anti-competitive conduct by companies. Competition law is implemented through public and private enforcement. It is also known as antitrust ...
Further reading
* Chassang, Sylvain; Ortner, Juan (2023). "
Regulating Collusion". ''Annual Review of Economics'' 15 (1)
References
General references
* Vives, X. (1999) ''Oligopoly pricing'',
MIT Press
The MIT Press is the university press of the Massachusetts Institute of Technology (MIT), a private research university in Cambridge, Massachusetts. The MIT Press publishes a number of academic journals and has been a pioneer in the Open Ac ...
, Cambridge MA (readable; suitable for advanced undergraduates.)
*
Tirole, J. (1988) ''The Theory of Industrial Organization'', MIT Press, Cambridge MA (An organized introduction to industrial organization)
*
Tirole, J. (1986), "Hierarchies and Bureaucracies", Journal of Law Economics and Organization, vol. 2, pp. 181–214.
*
Tirole, J. (1992), "Collusion and the Theory of Organizations", Advances in Economic Theory: Proceedings of the Sixth World Congress of the Econometric Society, ed by J.-J. Laffont. Cambridge: Cambridge University Press, vol.2:151-206.
Inline citations
{{Authority control
Anti-competitive practices
Game theory
Bidding strategy
Strategy (game theory)