Only applicable to horizontal mergers → vertical mergers cut the different dimension (many markets)
- HHI before merger: (40^2 + 30^2 + 30^2) = 3.400
- HHI after merger: (70^2 + 30^2) = 5.800
- delta: 2.400
- deltas of more than 1.000 are critical in horizontal mergers
related to EU Merger Regulation, Mergers and Acquisitions