10.8. In a competitive market, there is currently no tax, and the equilibrium price is $60. The market has a downward-sloping demand curve. The government is about to impose an excise tax of $4 per unit. In the new equilibrium with the tax, what price will producers receive and consumers pay if the supply curve is

a) Perfectly elastic?

b) Perfectly inelastic?

Illustrate your answers graphically.