Scenario 19-5 Billy Works for the Local Piano Moving Company Part-Time After

Scenario 19-5
Billy works for the local piano moving company part-time after school.Billy has worked for the company for two years but still hasn't received a wage increase,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 a victim of labor-market discrimination.
-Refer to Scenario 19-5.In a competitive market for piano movers,why might Billy's wage differential persist?

A) Billy workers harder than the other employees.
B) Billy joins a labor union.
C) Billy's amiable personality allows him to work well with his co-workers.
D) Customers do not like Billy because he has a bad attitude.