RT Journal T1 Trade Liberalization and Wage Inequality: Evidence from the U.S. States A1 Xiaofeng Penny Li PB Front. Econ. China FD 2015-09-15 YR 2015 JF Frontiers of Economics in China JO Front. Econ. China VO 10 IS 3 SP 527 DO 10.3868/s060-004-015-0023-9 K1 trade liberalization;wage inequality;skill-biased technological change;de-unionization LK {https://academic.hep.com.cn/fec/EN/article/article_12779.shtml}