Retailers doing business in Massachusetts should ensure that their price comparison advertising complies with Massachusetts law, particularly 940 C.M.R. § 6.05 (Section 6.05). Otherwise, they may face a civil enforcement action by the Massachusetts Office of the Attorney General (MA AGO), a putative class action brought by a consumer under the Massachusetts Consumer Protection Act – Chapter 93A, or even a civil action brought by a competitor alleging unfair and deceptive trade practices.