Karen and Norma are both employed by the same housekeeping firm. Karen earns $12 / hour for a 40 hour work week, while Norma boasts $18 / hour. Jessie, the boss, justifies the wage disparity by claiming that Karen is a big drama queen who refuses to clean the clients' toilet brushes, whereas Norma readily embraces such a task -- a task ruled to be not dangerous by O H & S.

Is Jessie's justification sufficient?