## 6 Discussion and Limitations
### Discussion
#### 6.1.3 Number of Manufacturing Practitioners (N_MP)  
Figure 7 shows the spatial relationship between N_MP and inferiority. Figure 7 shows that in the six-year study, there were both positive and negative correlations between N_MP and inferiority. However, overall, the positive correlation was dominant, and the area with a positive correlation increased year by year, while the area with a negative correlation decreased. The areas with a negative correlation are mainly distributed in northeast and north China.  
Moreover, in Figure 7, the positive correlation coefficient in the southern region is higher than that in the north. The regression coefficients of the Yangtze River Delta region and Shandong Province has consistently high values during the study period, suggesting that N_MP in these regions has a strong positive correlation with inferiority. Specifically, in 2017, the regression coefficients of N_MP showed a regular increasing trend from western China to eastern China. The regions with the largest regression values were mainly in the central and eastern regions of China, especially in the two important industrial bases in China--the Beijing-Tianjin-Tangshan region and the Yangtze River Delta. These phenomena show that N_MP has a strong positive correlation with inferiority in the regions that are mentioned above. Within these regions, the increase in the number of manufacturing employees leads to an increase in inferiority among the practitioners. With the in-depth implementation of the \"Made in China 2025\" strategy, China has significantly increased its investment in manufacturing, and the number of people employed in manufacturing has also increased dramatically [30; 59]. By 2017, China's manufacturing industry employed nearly 50 million people, and industry competition as well as competition among the practitioners in the industry has become unprecedentedly fiere [23]. In this competitive environment, individuals' shortcomings in their ability or personality can lead to an increase in their sense of inferiority [6; 53]. Previous studies have shown that moderate competition in the workplace is conducive to the development of people's physical and mental health and an improvement in their work quality. However, when the intensity of the competition exceeds a certain threshold, it causes great psychological and physical harm [60]. In addition, excessive competition brings excessive pressure, which can lead to inferiority and may even cause physical reactions, such as headaches and dizziness, as well as severe psychological diseases, such as anxiety and depression [61; 62].  
Therefore, individuals need to adjust their mentality, find ways to reduce their stress, and develop a healthy lifestyle [13; 63; 36]. Relevant government departments and manufacturing enterprises should take effective intervention measures, such as offering mental health education, mental health counseling, and recreational activities [64; 65]. Employees can develop healthy work and lifestyle practices to help individuals experiencing inferiority regulate their emotions and maintain a healthy life and work state [40; 60].