Packages move along a conveyor belt at an Amazon Fulfillment center on Cyber Monday in Robbinsville, New Jersey, on Nov. 28, 2022.Stephanie Keith | Bloomberg | Getty ImagesFederal regulators have determined that Amazon can be held responsible for defective goods sold by third-party merchants on its online marketplace, rejecting the company's position that it's merely an intermediary between consumers and sellers.In a landmark order released Tuesday, the U.S. Consumer Product Safety Commission sa...