Does the employee compare him- or herself to others in a negative way?
Employees tend to compare themselves to others to determine whether they are being treated fairly. This comparison affects their motivation to do the job. When employees perceive that they are receiving a fair reward for their work, they are likely to maintain their efforts and deliver expected results. However, if employees believe their efforts are not rewarded appropriately and that others are getting the same or better rewards for less input, they may reduce their efforts to match "unfair" rewards.