I often read about antitrust cases alleging price-fixing. Many of these cases are class actions. I've never really understood what "antitrust" means or exactly what a "class action" is. Can you explain these terms in layman's language?

A: "Antitrust" is a confusing name for a complex area of law. Many nonlawyers misuse the word, giving it a meaning that is almost opposite its true denotation when they say things like "the airlines' behavior is antitrust."

A trust is an old synonym for a monopoly or cartel that acts like a monopoly. In 1990, Congress passed a law designed to do away with monopolies, so the antimonopoly law was called the "antitrust" law. The hyphen was later dropped.

For companies in service businesses like travel, there is really only one antitrust law, which is the one passed in 1890, now called the Sherman Antitrust Act. The law prohibits two broad categories of behavior by companies.

First, under Section 1 of the Sherman Antitrust Act, all agreements that restrain interstate commerce are illegal.

However, as the Supreme Court recognized early in the 20th century, Congress didn't really mean to outlaw all restraints, just the bad ones.

Ordinary restraints, such as an employee's agreement to work only for one employer, are just fine. The Supreme Court later divided the bad restraints into two categories: "per se" violations and "rule of reason" violations. The first category refers to the very bad agreements, such as price-fixing by competitors and group boycotts.

The second category refers to agreements that could be bad depending on the defendant's market power, such as exclusive dealing and tying arrangements. The important thing to remember is that you have to prove an agreement in order to prove a Section 1 violation.

Section 2 of the act makes it illegal for a company to monopolize a market, regardless of any agreement.

Here again, the Supreme Court long ago decided that Congress really meant to outlaw only monopolies that suppress competition by such tactics as predatory pricing. Later, the Act was interpreted to prohibit attempts to monopolize, as well.

So, in short, Section 1 of the Sherman Antitrust Act outlaws agreements to fix prices and to conduct boycotts and other joint behavior that courts have found to be bad.

Section 2 covers a single company's attempts to monopolize or maintain a monopoly through unfair methods. Don't call these behaviors "antitrust." Rather, say that they violate the antitrust laws.

Next week, I'll cover what class action means.

Mark Pestronk is a Fairfax, Va.-based attorney specializing in travel law. He answers your questions in the TravelWeekly.com Legal Ease forum. To contact Mark directly, e-mail him at [email protected].

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