"Why do various workers exhibit dissimilar motivational levels and performance results within the same incentive systems? According to expectancy theory, this might result from distinct evaluations of whether those rewards deserve corresponding effort. We proposed and verified that affective states influence the valuation of effort and reward. We concluded that happy people are likely to exert efforts for future rewards and sad people tend to seek rewards without extra effort. Our finding can explain divergent employee reactions to the same incentive programme. Our results provide an explanation for the finding that happy workers are more productive than sad workers. These results have crucial implications for human resource management theory and practice. "

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