Which of the following generation categories has the largest population in the United States in 2017?

Suppose there are ten firms that occupy the Odell, Oregon cherry pie market. The market share of each firm is listed in the above table

a) What is the four-firm concentration ratio in this market? b) What is the Herfindahl-Hirschman Index for this market? c) If Firm H and Firm A merge, what is the new Herfindahl-Hirschman Index for this market? d) A severe winter causes every firm except A, B, and E to close. With only these three firms operating, Firm A's market share is 71 percent, Firm B's market share is 23 percent, and Firm C's market share is 6 percent. What is the Herfindahl-Hirschman Index for this market now?

The efficient level of recycling equates the

A) marginal cost of scrap disposal to the marginal benefit from not using virgin materials. B) marginal cost of recycling to the marginal benefit from not using virgin materials. C) marginal cost of scrap disposal to the marginal cost of recycling. D) marginal private cost of disposal to the marginal cost of recycling. E) per-unit refund from recycled materials to the marginal benefit from not using virgin materials.