Suppose that a small town has seven burger shops whose respective shares of the local hamburger market are (as percentages of all hamburgers sold): 23%, 22%, 18%, 12%, 11%, 8%, and 6%. Instructions: Enter your answers as whole numbers. a. What is the four-firm concentration ratio of the hamburger industry in this town? %. b. What is the Herfindahl index for the hamburger industry in this town? . c. If the top three sellers combined to form a single firm, what would happen to the four-firm concentration ratio and to the Herfindahl index? The four-firm concentration ratio would be %. The Herfindahl index would be .