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This study investigated the relationships between the personal psychological resources of optimism and selfefficacy, and their apparent effect on the ability of an individual to experience meaningful work (manifested in engagement with the task and commitment to the organisation), to assess their combined effect on employee subjective well-being (i.e. better psychological health and more work-life satisfaction). Drawing on Fredrickson’s broaden-and-build theory (1998), it was argued that, on their own and in conjunction with each other, these variables are rooted in a similar framework that might elicit positive emotions to establish and maintain durable, long-term, subjective well-being. A structural model of subjective well-being at work was conceptualised and tested. A cross-sectional dataset (N = 202), obtained from employees at three organisations in South Africa, was used to fit the structural model using structural equation modelling. The goodness-of-fit results for both the measurement and the structural models were satisfactory. The results suggested that optimism directly influences psychological health. The relationship between optimism and subjective well-being (i.e. psychological health and satisfaction with work-life) was further highlighted by means of an indirect effect, mediated by a combination of work engagement and organisational commitment (i.e. meaningfulness). The structural model results revealed that no significant paths were evident between self-efficacy and any of the other variables. Practically, the results highlight the vital role of optimism in experienced subjective well-being, and suggest that investing in interventions to increase optimism in employees might well be justified.
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