Happy employees have more engaging and autonomous jobs, they are more satisfied with their jobs, and they show superior performance in the workplace than less happy employees. Furthermore, happy workers are more likely to engage in beneficial extrarole behaviors and less likely to engage in withdrawal behaviors. Finally, employees with high positive affect garner both material and interpersonal rewards. Although such crosssectional evidence only allows for correlational inferences, we now turn to longitudinal evidence, which supplements the cross-sectional data by establishing a temporal order for the incidence of happiness and success.