Nolo's Plain-English Law Dictionary

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Unfair Competition
Any commercial behavior or activity that is legally unjust or deceptive. It includes such diverse activities as trademark infringement, false advertising, and theft of trade secrets but can include any illegal dirty tricks within the marketplace. If a court finds that an activity constitutes unfair competition, it will prevent that activity from occurring in the future and may award money damages to the person or company harmed by the activity.