QUESTION 9 Which of the following would shift a firm's entire average cost curve down? Assume this a cost curve for a single product O A. Economies of scale B. Economies of scope O C. A successful learning curve D. Both B & C O E. All of the above. QUESTION 10 The demand curve facing a firm in a perfectly competitive industry is... Perfectly inelastic Inelastic Unit elastic Perfectly elastic O None of the above