RT Journal T1 Income Disparity, Digital Service Import and Digital Marginalization A1 LIAO Jia, LI Si-yi PB Journal of Guizhou University of Finance and Economics FD 2022-09-15 YR 2022 JF Journal of Guizhou University of Finance and Economics JO Journal of Guizhou University of Finance and Economics VO 40 IS 05 SP 32 DO K1 income disparity;digital service import;digital marginalization;instrumental variable;difference GMM LK {https://gcxb.gufe.edu.cn/EN/article/article_9359.shtml}