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The purpose of this study is to investigate the structural relationship model among narcissism, work centrality, employee engagement and discretionary effort.

Respecting the quantitative approach, the data were gathered by means of the survey completed by 1,190 respondents of Generation X, Y and Z working in the Thai service and manufacturing industries.

The findings of the study indicated positive associations between narcissism and work centrality, narcissism and employee engagement, work centrality and employee engagement and employee engagement and discretionary effort. It was observed that work centrality played a partially mediating role in the relationships between narcissism and employee engagement, while employee engagement fully mediated the associations between work centrality and discretionary effort, as well as between narcissism and discretionary effort. The structural model demonstrated variations across different generational cohorts, suggesting that the relationships differed among generations. However, the model did not exhibit any variations across different types of industries. Furthermore, the findings from the Thai samples indicated that generational differences had a moderating effect on the path relationships between narcissism and work centrality (with Generation Y having a stronger effect compared to Generation Z and Generation X), narcissism and employee engagement (with Generation Y having a stronger effect compared to Generation Z and Generation X) and narcissism and discretionary effort (with Generation X having a stronger effect compared to Generation Y and Generation Z), all with a significance level of 95%. Additionally, the relationship between employee engagement and discretionary effort showed a significant difference across generations, with Generation Z exhibiting a stronger effect compared to Generation Y and Generation X, at a significance level of 99%.

This study provides empirical evidence supporting the positive relationships between narcissism and work centrality, as well as narcissism and employee engagement, contrary to previous research findings. The results reveal that employee engagement fully mediates the associations between work centrality and discretionary effort, as well as between narcissism and discretionary effort, offering valuable contributions to the existing literature. Furthermore, this study expands on previous research by examining the moderating effect of industry type, specifically comparing manufacturing and service industries. The findings suggest that the model exhibits variations across different generational cohorts, highlighting the importance of considering generational differences in understanding these relationships. However, the model does not exhibit variations across different types of industries.