Billy works for the local piano-moving company part-time after school. Billy has worked on the job for a couple of years but still hasn't received a wage rise, even though newer employees have received raises. Billy has threatened his employer with a lawsuit if he doesn't get a raise in the next few weeks. Billy believes he is being severely discriminated against.
Use this information to answer the following question(s).

Elucidate why might an economist be skeptical of Billy's discrimination complaint?

a. Through antitrust laws, discriminating firms can be penalised with large fees.

b. Discrimination leads to profit maximisation.

c. Only cost minimisers practice discrimination.

d. In a competitive market, employers pay employees based on their value to the firm.