(1) as the Commission considers appropriate. (b) Prohibition Not later than 18 months after the date of enactment of this Act, the Commission shall promulgate regulations under section 553 of title 5, United States Code, to prohibit any manufacturer from engaging in shrinkflation. 4. Enforcement (a) Enforcement by the Commission (1) Unfair or deceptive acts or practices A violation of a regulation promulgated under section 3(b) shall be treated as a violation of a rule defining an unfair or deceptive act or practice under section 18(a)(1)(B) of the Federal Trade Commission Act ( 15 U.S.C. 57a(a)(1)(B) ). (2) Powers of the Commission (A) In general The Commission shall enforce the regulations promulgated under section 3(b) in the same manner, by the same means, and with the same jurisdiction, powers, and duties as though all applicable terms and provisions of the Federal Trade Commission Act ( 15 U.S.C. 41 et seq. ) were incorporated into and made a part of this Act. (B) Privileges and immunities Any person who violates a regulation promulgated under section 3(b) shall be subject to the penalties and entitled to the privileges and immunities provided in the Federal Trade Commission Act ( 15 U.S.C. 41 et seq. ). (C) Authority preserved Nothing in this Act shall be construed to limit the authority of the Commission under any other provision of law. (D) Rulemaking The Commission shall promulgate in accordance with section 553 of title 5, United States Code, such rules as may be necessary to carry out this Act. (b) Enforcement by States (1) In general In any case in which the attorney general of a State has reason to believe that an interest of the residents of the State has been or is threatened or adversely affected by the engagement of any person in a practice that violates a regulation promulgated under section 3(b), the attorney general of the State may, as parens patriae, bring a civil action on behalf of the residents of the State in an appropriate district court of the United States— (A) to enjoin further