Carol works in the same company as bob. she performs the same work, but receives a lower salary. this is an example of
price discrimination
wage discrimination
wage structure

The answer to this question is wage discrimination. Although, Carol works in the same company as Bob, she receives a lower salary or pay compared to him. Discrimination is clearly evident in a way that they work for the same company and with the same job but she gets a lower pay. 

Carol works in the same company as Bob. She performs the same work, but receives a lower salary. This is an example of "wage discrimination".

Wage discrimination refers to the discrimination appeared in the installment of wages towards minority gatherings. The objectives of wage separation are dark people, and white ladies. They are looked with diminished working class for a similar activity with a similar execution levels and duties as white guys. Wage discrimination is appeared towards people with equal instructive foundation and capabilities.  

i guess you could put raise the economic balance