What types of practices are prohibited by California’s unfair competition law?

California’s Unfair Competition Law is exceedingly broad. It generally allows a private party to sue for any business practice that is otherwise forbidden by law, even if that law does not itself include a private right of action. It also allows suit for business practices that are deceptive, even if they do not amount to actual fraud, and for business practices that are "unfair," even if they are not otherwise unlawful. Whether a business practice is prohibited by the Unfair Competition Law must often be determined on a case-by-case basis.

California’s Unfair Competition Law also includes a prohibition against false advertising that overlaps that of California’s False Advertising Statute.