Much like other prevalent theories of motivation, such as Maslow's hierarchy of needs, equity theory acknowledges that subtle and variable individual factors affect individuals' assessment and perception of their relationship with their relational partners. According to Adams, underpayment inequity induces anger, while overpayment induces guilt. Compensation, whether hourly or salaried, is a central concern for employees and therefore the cause of equity or inequity in most, but not all, cases.