European and U.S. Antitrust Regulators Don't See Eye-to-EyeCOMPETITOR FOCUS

In Europe, antitrust complaints from a company's rivals are taken more seriously. In the U.S., consumer harm is the key test.LEGAL PRINCIPLES

Concepts such as portfolio power--achieving greater market power by bundling goods and services--are more important in Europe.REMEDIES

The European Commission's Merger Task Force can nix a merger without taking a company to court.