Suppose that Frances receives higher pay at her workplace than her colleagues do, even though they perform essentially the same type of work. If Frances's productivity is about 25% higher than that of...

Suppose that Frances receives higher pay at her workplace than her colleagues do, even though they perform essentially the same type of work. If Frances's productivity is about 25% higher than that of each of her colleagues, which of the following wage concepts can explain this wage disparity? Check all that apply.