Answer: does not directly quantify market power.

## Explanation The concentration ratio measures the combined market share of the largest firms in an industry (typically the top 4 or 8 firms). While it provides an indication of market concentration, it has several limitations: **Why Option B is correct:** 1. **Indirect measure**: The concentration ratio doesn't directly measure market power - it only measures market share concentration. Market power refers to a firm's ability to influence prices, output, and competition, which depends on many factors beyond just market share. 2. **Missing information**: It doesn't account for: - Barriers to entry - Product differentiation - Elasticity of demand - Potential competition - Geographic market boundaries - Import competition **Why other options are incorrect:** - **Option A**: Concentration ratios are actually relatively easy to compute using market share data, making this statement false. - **Option C**: While mergers do affect concentration ratios, this is actually a feature, not a disadvantage. The ratio should reflect changes in market structure, including mergers. **Additional disadvantages of concentration ratios:** 1. **Arbitrary cutoff**: The choice of top 4 vs top 8 firms is arbitrary 2. **Ignores distribution**: A 4-firm ratio of 80% could mean 20% each or 50%, 15%, 10%, 5% 3. **No information about smaller firms**: Doesn't show the competitive fringe 4. **Geographic limitations**: Assumes national markets when some are local/regional **Better alternatives**: - Herfindahl-Hirschman Index (HHI) - Lerner Index - Price-cost margins - Entry barrier analysis Therefore, the primary disadvantage is that concentration ratios provide an indirect, incomplete measure of market power rather than directly quantifying it.

Author: LeetQuiz .