New claims slid 12,000 to 323,000 in the week ended Nov. 20. Economists expected little change. The 4-week average, which smooths out weekly swings, slid 6,500 to 332,000, the lowest in four years. Continuing claims fell 25,000 to 2.755 mil in the week ended Nov. 13 to a 3 1/2-year low. The data signal companies may be less reluctant to hire. More