Mich. Comp. Laws § 445.106a: Unlawful trade practices; sale at reduced price, false representation.

Sec. 6a.

It shall be an unlawful trade practice for any person, in connection with an offer or exhibit of any goods, wares, or merchandise for sale at retail, or an exhibit of samples, catalogues or other forms of advertising listing goods, wares, or merchandise for retail sale, to display price tags or price quotations in any other form, which are substantially in excess of the prices at which such goods, wares, or merchandise are regularly or customarily sold at retail by such person or by the person issuing such samples, catalogues or other advertising, so as to imply falsely that the goods, wares or merchandise are offered for sale at a reduction from an indicated regular retail price.