Market concentration
Contents
Place in the Framework
Market concentration measures help determine whether a merger creates a structural presumption of competitive harm.
Core Questions
- What are the pre-merger and post-merger market shares?
- How does the HHI change after the merger?
- When does concentration evidence establish a prima facie case?
Working Notes
Add notes here on HHI thresholds, share evidence, structural presumptions, and limits of concentration-based inference.