A firm in a purely competitive industry has a typical cost structure. The normal rate of profit in the economy is 5 percent. This firm is earning $15 on every $150 invested by its founders. Instructions: Enter your answers as whole numbers. a. What is its percentage rate of return? b. Is the firm earning an economic profit? If so, how large? c. Will this industry see entry or exit? d. What will be the rate of return earned by firms in this industry once the industry reaches long-run equilibrium?

Which (if any) of the following scenarios is the result of a natural monopoly? instructions: you may select more than one answer. a. patent holders of genetically modified seeds are permitted to sue farmers who save seeds from one planting season to the next. b. doctors in the united states are prohibited from practicing without a medical license. c. there is one train operator with service from baltimore to philadelphia. d. coal is used as the primary energy in a country with abundant coal deposits.