f. Many public utility companies are required, through regulation, to set prices so that they earn a "normal rate of return" on their investment. In other words, they are required to set prices so that they earn zero profits. The objective of the regulation is to mimic a perfectly competitive outcome where firms earn zero profits. Based on the numerical example above explain the problem with this kind of regulation. In your answer, be sure to explain the difference between earning zero profits and achieving market efficiency