Assume market equilibrium price for a visit to the doctor is currently $75. The federal government decides that something fishy is going on and mandates a price ceiling of $81. This means no doctor may charge more than $81 for a visit. What will happen in the market for doctor's visits?
a. nothing
b. there will be a shortage (a bunch of people want to see doctor but can't)
c. there will be a surplus (a bunch of doctors are sitting around with empty exam rooms)
d. Market price for doctor visits will rise to exactly $81