An industry consists of three firms with sales of $235,000, $680,000, and $315,000.
a. Calculate the Her find a hl-Hirschman index (HHI).
Instruction: Round to the nearest integer.
b. Calculate the four-firm concentration ratio (C4).
c. Based on the FTC and DOJ Horizontal Merger Guidelines described in the text, is the Department of Justice likely to attempt to block a horizontal merger between two firms with sales of $235,000 and $315,000? (YES OR NO)