3M Sues Amazon Merchant for Selling Masks at 18 Times List Price

3M Co. filed a lawsuit against a merchant selling masks on Amazon. com Inc. for more than 18 times their list price, the manufacturer’s latest attempt to help bring some order to the chaotic market for protective equipment. In a lawsuit filed in federal court in California, 3M said Mao Yu and his affiliated companies sold what he described as 3M masks for an average price of $23.21 each on Amazon.