Oligopoly

Sometimes, only a few big shops sell things.

These shops watch each other very closely. If one shop changes a price, the others react. This is because they depend on each other.

Some shops try to work together. They might agree to keep prices high. This helps them make more money.

In many lands, this is against the law. Laws help keep things fair for everyone.

It can be hard for new shops to start. They may need a lot of money first. This keeps the few big shops in charge.

An oligopoly is a type of market. In this market, only a few sellers have power. Because there are so few, they depend on each other. If one company changes a price, the others will react.

Sometimes, these companies try to work together. This is called collusion. They might agree to keep prices high to make more money. This can happen in a cartel. A cartel is a group of makers that work together. In many places, this is against the law. Laws in Europe and the US help keep things fair. In Australia, laws also stop these unfair deals.

It can be hard for new companies to join. This is because of barriers to entry. These are things that make it tough to start. A company might need a lot of money. They might also need special licenses or complex tools.

Some oligopolies sell things that are exactly the same. This is a perfect oligopoly. An example is mining or farming. Other markets sell different things. This is an imperfect oligopoly. This happens in making goods or services. Some markets are tight. This means there is very little competition. Others are loose. In a loose market, there are more firms working together.

An oligopoly is a special kind of market. In this market, only a few sellers have most of the power. Because there are so few companies, they are interdependent. This means that what one company does affects all the others. If one firm changes its price, the other firms will likely react.

This connection makes the market very different from others. In a market with many sellers, one small company cannot change prices alone. In an oligopoly, every move matters to the whole group.

Sometimes, these companies try to work together to make more money. This is called collusion. They might make agreements to keep prices high or control how much they sell. One way they do this is by forming a cartel. A cartel is a group of makers that join together to control a market. However, these groups can be hard to keep stable. Members often break their promises to gain a quick profit for themselves.

This constant watching of each other is a big part of how they work.

Many countries have laws to stop companies from acting unfairly. In Europe, the EU has laws against price-fixing. In the United States, the Department of Justice and the Federal Trade Commission work to stop collusion. Australia also has laws to regulate these kinds of agreements. These laws usually focus on formal deals like cartels. It can be hard to catch companies that use tacit collusion. This is when companies seem to follow each other without actually talking directly.

There are different ways to group these markets. A perfect oligopoly sells items that are exactly the same, like sugar or minerals. An imperfect oligopoly sells items that are different, like cars or services. Markets can also be tight or loose. A tight oligopoly has very little competition among its few firms. We can measure this using a four-firm concentration ratio. If this number is higher than 60, the market is considered tight.

If the number is between 40 and 60, it is a loose oligopoly.

It is often very hard for new companies to join these markets. These hurdles are called barriers to entry. A new company might need huge amounts of money to start. They might also need special government licenses or very complex technology. Sometimes, existing companies use their size to keep others out. This is called economies of scale, where being big makes costs lower.

These barriers help the current companies keep their high profits and control the market.

An oligopoly is a specific type of market structure. In this market, a small number of sellers hold significant power over pricing. Because there are so few participants, these firms are mutually interdependent. This means that any action taken by one firm is expected to affect the others. Consequently, the other firms will likely react with their own actions. This interdependence is a defining feature that separates oligopolies from other market types.

There are several ways to categorize these markets based on their products. A perfect oligopoly occurs when firms produce homogenous commodities. These are goods that are identical or materially the same in nature. Examples include primary industries like agriculture or mining. In these markets, consumers are often indifferent between products if prices are the same. Conversely, an imperfect oligopoly involves firms producing heterogeneous goods. These products are diverse and different from one another. This structure is common in manufacturing and service industries.

Oligopolies can also be classified by how easy it is for new competitors to enter. An open oligopoly has no significant barriers to entry. In this scenario, new firms can freely enter the market. A closed oligopoly is different because it has prominent barriers to entry. These barriers prevent other firms from easily joining the industry. Common barriers include high investment requirements and strong consumer loyalty to existing brands. Regulatory hurdles and economies of scale also act as barriers. These obstacles allow existing firms to maintain specific prices and maximize their profits.

Sometimes, firms in an oligopoly engage in collusion to increase their earnings. Collusion happens when firms make agreements to follow a specific price structure. These agreements can be express or tacit. Express collusion involves direct communication, while tacit collusion happens without formal talk. Colluding firms can achieve profits above the normal market equilibrium. One extreme form of collusion is a cartel. A cartel is a monopolistic organization of manufacturers. They agree on commodity prices, output, and market share to control the market. However, cartels are often unstable because members may break the alliance for short-term gains.

Because collusion can harm competition, many governments have strict laws against it. In Europe, EU competition law prohibits price-fixing and market manipulation. In the United States, the Department of Justice Antitrust Division and the Federal Trade Commission monitor these activities. Australia also uses the Federal Competition and Consumer Act 2010 to regulate anti-competitive practices. These laws typically target formal collusion like cartels. It is often difficult to prove tacit collusion because it lacks direct communication. This makes it harder for legal authorities to enforce competition rules.

Economists use the four-firm concentration ratio to measure market competition. This ratio calculates the total market share held by the top four firms in an industry. This number helps determine if an oligopoly is tight or loose. If the ratio is higher than 60, the market is a tight oligopoly. This means there is very little competition among the dominant firms. If the ratio falls between 40 and 60, it is a loose oligopoly. In a loose oligopoly, there are many interdependent firms that often collude.

Oligopolies can also be described by how much control individual firms have. A full oligopoly exists when no single price leader is present. In this type, all firms enjoy relatively similar levels of market control. A partial oligopoly is different because one firm dominates the industry. This dominant firm achieves market saturation by producing a high percentage of total output. Because of this, partial oligopolists can "price-make" rather than simply "price-take." They have a large influence over all market conditions.

One major reason for oligopoly power is economies of scale. This occurs when a firm's average cost per unit decreases as its output increases. Large firms benefit from lower marginal costs, giving them a distinct advantage. Companies often use mergers to achieve these economies of scale. By merging, two firms can increase their size and diversify their markets. This allows them to grow with very small increases in relative output costs. Such moves help large business groups increase their profit margins by absorbing smaller companies.