The responses indicate that it is more cost-efficient for a sole producer to operate in this market versus multiple producers. Additionally, it is indeed correct that natural monopolies can generate positive profits in the short term without government intervention.
The annual pretax cost of debt is 8%, while the after-tax cost amounts to 4.8%. By applying the rate formula, we analyze the NPER over 20 years with a present value of $1,294.54 and a future value of $1,000. The PMT computed is $110 from the 11% coupon. Subsequently, the after-tax cost of debt is calculated as: 8% × (1 - 0.40) = 4.8%.