This study estimates union wage premiums and analyzes the influence of trade unions on the wage gap between rural migrants and local urban workers in China by employing the Blinder–Oaxaca decomposition method based on national longitudinal survey data from the China Family Panel Studies (2010–2018). The results indicate that the union wage premium among rural migrant workers is greater than that among local urban workers. The disparity in union density widens the wage gap, whereas the difference in union wage premiums narrows the wage gap between the two groups. Moreover, the contribution rate of the former is greater than that of the latter. These results suggest that expanding union coverage among rural migrant workers could effectively contribute to reducing the wage gap.
China's multilevel medical education system generates tremendous physician human capital heterogeneity. This paper attempts to take advantage of the differences level of doctors' human capital to reveal the relationship between healthcare service mismatch and doctors' human capital using the DRGs data of a province in China. This paper found that: first, a higher level of physician human capital (PHC) in hospitals significantly increases the mismatch of medical services; second, there is a complementary effect between doctors' human capital and medical care accessibility, which significantly increases the degree of healthcare service mismatch, and these conclusions still hold after controlling the endogeneity and a series of robustness tests. Third, the mismatch effect is more significant in surgery than that of in internal medicine departments and the mismatch effect is stronger in county hospitals than that of provincial hospitals. Therefore, both patients' great confidence in superior medical services and the heterogeneity of PHC contribute to the mismatch of medical services in China.

