Elario makes delicious cupcakes that he mails to customers across the country. His cupcakes are so delicious that he has a great degree of pricing power. Elario's customers have identical demands for cupcakes. A representative customer's demand is shown in the diagram on the right. Elario can make a cupcake for a constant marginal and average total cost of $0.50.
a. If Elario is an ordinary monopolist, what price should he charge for cupcakes? How many will each customer order? How much profit will Elario earn? How much consumer surplus will the buyer get?
b. Suppose that Elario decides to offer a quantity discount according to the following terms: The first 10 cupcakes can be bought for $1.50 each; any cupcake over 10 will be offered at a discounted price. What discount price will maximize Elario's profit from this pricing scheme? (Hint: Draw a new demand curve for Elario's customers' demand, but because his customers have already purchased 10, begin your demand curve at the 11th unit. Alternatively, shift the vertical axis to the right by 10 units.)
c. How many cupcakes will customers order at full price? How many at the discounted price?
d. What will Elario's profit be? How does this scheme compare to the profit he earned as an ordinary monopolist?
e. Suppose that Elario gets super-greedy and decides to implement a three-tiered pricing system. What three prices should he choose to maximize his profit? At what quantities will the price points change? What will his profit be?
f. Suppose Elario decides to charge $2.40 for the first cupcake, $2.30 for the second, and so on. How many cupcakes will he sell, and what will his profit be?
g. What happens to consumer surplus as Elario adds more price points? Where does it go?

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Price (S/cupcake) $2.50 MC ATC 0.50 0 20 25 Quantity of cupcakes