; or (ii) if the person who committed the violation has unfair leverage, 5 percent of the revenues earned by the person's ultimate parent entity during the preceding 12-month period. (F) Rulemaking (i) In general The Commission may promulgate in accordance with section 553 of title 5, United States Code, such rules as may be necessary to carry out this section, including guidelines regarding what circumstances constitute an exceptional market shock or guidelines that provide for additional characteristics that demonstrate that a person has unfair leverage. (ii) Required guidance Not later than 180 days after the date of enactment of this Act, the Commission shall promulgate regulations regarding violations of this section, which shall include guidelines on, for the purposes of this Act, what constitutes a market, a grossly excessive price for a good or service, and an excessive price for a good or service. (iii) Definition of grossly excessive price (I) In general For purposes of subsection (a) and the guidelines on what constitutes a grossly excessive price described in clause (ii), the Commission shall define the term grossly excessive price using any metric it deems appropriate. (II) Definition considerations In formulating the definition in subclause (I), the Commission shall consider whether to provide that such term shall include a price for a good or service that is an amount equal to or greater than 120 percent (or a lesser percentage, as determined appropriate by the Commission) of the average price for such good or service in the market during the 6-month period preceding the sale or offer that allegedly violates subsection (a). (g) Enforcement by state attorneys general (1) In general If the attorney general of a State has reason to believe that any person has violated or is violating this section, the attorney general, in addition to any authority it may have to bring an action in State court under the laws of such State, may bring a civil action in any appropriate United States district court or in