Holding that "[i]nterpretations of federal antitrust law are at most instructive, not conclusive, when construing the Cartwright Act, given that the Cartwright Act was modeled not on federal antitrust statutes but instead on statutes enacted by California's sister states around the turn of the 20th century."
Holding that "a litigant may not rely on the proscriptions of section 790.03 as the basis for a UCL claim," but that "when insurers engage in conduct that violates both [ section 790.03 ] and obligations imposed by other statutes or the common law, a UCL action may lie"