Which statement is wrong? A. Lerner index is usually lower for a more competitive market. B. Herfindahl-Hirshman index is usually higher for a more concentrated market. C. The welfare is lower in a more concentrated market. D. According to DOJ Merger Guidelines, if the Herfindahl-Hirshman index is higher than 1800, then mergers come under scrutiny. Answer: C. Welfare is enhanced if low cost firms gain market share at the expense of high cost firms