RT Journal T1 Intellectual Property Strategy and Private Enterprise Innovation—A quasi-natural experiment based on the national intellectual property rights demonstration city pilot A1 YAN Yong-sheng, LI Ling-fei, SHAO Chuan-lin 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 63 DO K1 intellectual property strategy;innovation;private enterprises;quasi natural experiment;heterogeneity LK {https://gcxb.gufe.edu.cn/EN/article/article_9362.shtml}