
Monopolies are generally considered illegal if they are achieved through exclusionary or predatory acts, such as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal. The Sherman Antitrust Act makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services. An unlawful monopoly exists when one firm has market power for a product or service, and it has obtained or maintained that market power, not through competition on the merits, but because the firm has suppressed competition by engaging in anticompetitive conduct. Monopolization offenses may be prosecuted criminally or civilly, with the aim of promoting fair competition and preventing unfair business practices that could harm consumers.
| Characteristics | Values |
|---|---|
| Agreements among competitors | To fix prices or wages, rig bids, or allocate customers, workers, or markets |
| Other agreements | Exclusive contracts that reduce competition |
| Monopoly power | One firm has market power for a product or service |
| How monopoly power is obtained or maintained | Not through competition on the merits, but because the firm has suppressed competition by engaging in anticompetitive conduct |
| How monopoly power is obtained or maintained | Exclusionary or predatory acts, such as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal |
| Prosecution | Criminal or civil |
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What You'll Learn
- Unlawful monopolies are when one firm has market power for a product or service, and it has obtained or maintained that power by suppressing competition
- The Sherman Act makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services
- Antitrust laws prohibit conduct by a single firm that unreasonably restrains competition by creating or maintaining monopoly power
- Monopolization offenses may be prosecuted criminally or civilly
- Obtaining a monopoly by superior products, innovation, or business acumen is legal; however, the same result achieved by exclusionary or predatory acts may raise antitrust concerns

Unlawful monopolies are when one firm has market power for a product or service, and it has obtained or maintained that power by suppressing competition
Monopolies are unlawful when one firm has market power for a product or service, and it has obtained or maintained that power by suppressing competition. This is prohibited under the Sherman Act, which makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services.
An unlawful monopoly is when a firm has market power for a product or service, and it has obtained or maintained that power, not through competition on the merits, but because it has suppressed competition by engaging in anticompetitive conduct. This may include exclusionary or predatory acts such as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal.
To judge the conduct of an alleged monopolist, an in-depth analysis of the market and the means used to achieve or maintain the monopoly is required. Obtaining a monopoly by superior products, innovation, or business acumen is legal. However, the same result achieved by exclusionary or predatory acts may raise antitrust concerns.
Antitrust laws aim to promote fair competition and prevent unfair business practices that could harm consumers. These laws prohibit conduct by a single firm that unreasonably restrains competition by creating or maintaining monopoly power. Courts will ask if the firm has "monopoly power" in any market and if that position was gained or maintained through improper conduct.
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The Sherman Act makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services
Monopolies are governed by antitrust laws, which aim to promote fair competition and prevent unfair business practices that could harm consumers. Under the Sherman Act, it is illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services. This means that a firm with a leading market position may not engage in conduct that unreasonably restrains competition.
To determine whether a firm has violated the Sherman Act, courts will first ask if the firm has "monopoly power" in any market. This requires an in-depth study of the products sold by the leading firm and any alternative products consumers may turn to if the firm attempted to raise prices.
The next step is to determine whether the firm gained or maintained its leading position through improper conduct. This could include exclusionary or predatory acts such as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal. However, obtaining a monopoly through superior products, innovation, or business acumen is legal.
If a firm is found to have engaged in anticompetitive conduct to suppress competition and obtain or maintain market power, it may be prosecuted criminally or civilly for monopolization offenses.
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Antitrust laws prohibit conduct by a single firm that unreasonably restrains competition by creating or maintaining monopoly power
Judging the conduct of an alleged monopolist requires an in-depth analysis of the market and the means used to achieve or maintain the monopoly. Obtaining a monopoly by superior products, innovation, or business acumen is legal; however, the same result achieved by exclusionary or predatory acts may raise antitrust concerns. Exclusionary or predatory acts may include such things as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal.
Monopolization offenses may be prosecuted criminally or civilly. This law aims to promote fair competition and prevent unfair business practices that could harm consumers. The first step in a court case is to ask if the firm has "monopoly power" in any market. This requires an in-depth study of the products sold by the leading firm and any alternative products consumers may turn to if the firm attempted to raise prices.
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Monopolization offenses may be prosecuted criminally or civilly
The Sherman Act also makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services. An unlawful monopoly exists when one firm has market power for a product or service, and it has obtained or maintained that market power, not through competition on the merits, but because the firm has suppressed competition by engaging in anticompetitive conduct.
Judging the conduct of an alleged monopolist requires an in-depth analysis of the market and the means used to achieve or maintain the monopoly. Obtaining a monopoly by superior products, innovation, or business acumen is legal; however, the same result achieved by exclusionary or predatory acts may raise antitrust concerns. Exclusionary or predatory acts may include such things as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal.
The antitrust laws prohibit conduct by a single firm that unreasonably restrains competition by creating or maintaining monopoly power. Courts will first ask if the firm has "monopoly power" in any market, which requires an in-depth study of the products sold by the leading firm and any alternative products consumers may turn to if the firm attempted to raise prices. Then, courts will ask if that leading position was gained or maintained through improper conduct—something other than merely having a better product, superior management, or historic accident.
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Obtaining a monopoly by superior products, innovation, or business acumen is legal; however, the same result achieved by exclusionary or predatory acts may raise antitrust concerns
Monopolies are not always illegal. Obtaining a monopoly by superior products, innovation, or business acumen is legal; however, the same result achieved by exclusionary or predatory acts may raise antitrust concerns.
The Sherman Act makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services. An unlawful monopoly exists when one firm has market power for a product or service, and it has obtained or maintained that market power, not through competition on the merits, but because the firm has suppressed competition by engaging in anticompetitive conduct.
Judging the conduct of an alleged monopolist requires an in-depth analysis of the market and the means used to achieve or maintain the monopoly. Exclusionary or predatory acts may include such things as exclusive supply or purchase agreements; tying; predatory pricing; or refusal to deal.
Courts will decide whether the monopolist's success is due to "the willful acquisition or maintenance of that power as distinguished from growth or development as a consequence of a superior product, business acumen, or historic accident." For example, Microsoft was found to have a monopoly over operating systems software for IBM-compatible personal computers. Microsoft was able to use its dominant position in the operating systems market to exclude other software developers and prevent computer makers from installing non-Microsoft browser software to run with Microsoft's operating system software.
Antitrust laws prohibit conduct by a single firm that unreasonably restrains competition by creating or maintaining monopoly power. Most Section 2 claims involve the conduct of a firm with a leading market position, although Section 2 of the Sherman Act also bans attempts to monopolize and conspiracies to monopolize.
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Frequently asked questions
A monopoly is when one firm has market power for a product or service, and it has obtained or maintained that market power, not through competition on the merits, but because the firm has suppressed competition by engaging in anticompetitive conduct.
The Sherman Act makes it illegal to monopolize, conspire to monopolize, or attempt to monopolize a market for products or services. It also prohibits conspiracies that unreasonably restrain trade, such as agreements among competitors to fix prices or wages, rig bids, or allocate customers, workers, or markets.
The antitrust laws prohibit conduct by a single firm that unreasonably restrains competition by creating or maintaining monopoly power. They aim to promote fair competition and prevent unfair business practices that could harm consumers.
Anticompetitive conduct includes exclusionary or predatory acts such as exclusive supply or purchase agreements, tying, predatory pricing, or refusal to deal.
Judging the conduct of an alleged monopolist requires an in-depth analysis of the market and the means used to achieve or maintain the monopoly. Courts will ask if the firm has "monopoly power" in any market and if that position was gained or maintained through improper conduct.














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