suppose a market consists 3 firms ( firm A, firm B, firm C) and firm A's sales account for 40% of market sales, while firm B and C each control 30% of the market. in this market, the four-firm concentration ration is therefore __________ and the Herfindahl-Hirshman index is equal to _____________. if the firm B and firm C merge, the new value of the Herfindahl-Hirshman index would change to__________. sothe Departement of Justice_________ likely to block this merger.    suggestions for the first:  suggestions for the second:  suggestions for the third:

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