please help me answer these questions in economics

23. The following graph depicts the demand Functions and the MC, AC curves of a monopolist Suppose demand changes From D1 to Dz. What would happen to the monopolist say one year (long run) after the change? D. 3 per um 0. BMW In Mlllbn! A. The monopolist will stay in the marlnet but earn a smaller prot compared to that beiore the change. B. Themonopolist will stay in .he market but sustain aloss. C. The monopolist will quit the market and earn a prot of zero. D. It mnnot be determined from the ineration given The U.S. Postal Service (USPS) has a constitutionally guaranteed monopoly on rstclass mail. In 2015, it charged 49 cents liar a stamp, which was not the protmaximizing pricelong dashthe USPS's goal, allegedly, is to break even rather than to turn a prot. Following the postal services in Australia, Britain, Canada, Switzerland, and Ireland, the USPS allowed Stamps.com to sell a sheet of twenty 49 cents stamps with a photo of your dogl your mommy, or whatever for 22 dollars. That's Ill] cent per stamp1 or a 224% markup. Stampseom keeps the extra beyond the 49 cents it pays the USPS. Answer the Following two questions. 29. What is Stampscom's Lerner's Index? A. I152 B. I153 C. I154 D. 0.55 3|]. What is the demand elasticity given the current price?I A. 4.80 B. 4.81 C. 4.82 D. 4.83 31. Xerox, the U.S. Postal Service, and McDonald's have enjoyed signicant market power in the past. Market power is eluded when A. better substitutes become available because the market has less competition. no substitutes are available because consumers have no choices. fewer substitutes are available because consumers are more sensitive to prices. better substitutes become available because consumers will not be willing to pay as much for a good. fewer substitutes are available because the market has less supply. F5559?\