Suppose that in the fast-food restaurant industry the four largest restaurants account for 30%, 20%, 15%, and 5% of the market share, respectively, and the 10 other small restaurants each account for...

Extracted text: Suppose that in the fast-food restaurant industry the four largest restaurants account for 30%, 20%, 15%, and 5% of the market share, respectively, and the 10 other small restaurants each account for 3%. If two of the 10 small restaurants merged, other things being equal, what would be the four-firm concentration ratio (CR) and the Herfindahl-Hirschman index (HHI). respectively? Select one: O a. 71%; 1640 O b. 70%; 1640 c. 71%; 1658 o d. 70%; 1658