ek Supp. 뉴포트 뉴스 조선소 및 드라이 도크(Newport News Shipbuilding and Dry Dock Co. v. EEOC, U.S. , S.Ct. See Newport News Shipbuilding and Dry Dock Co. v. EEOC, U.S. , S.Ct. 참조. The enactment of the PDA buttresses our holding in Manhart that the greater cost of providing retirement benefits for women as a class cannot justify differential treatment based on sex.