The prospect of a merger between UK supermarket chains Sainsbury’s and Morrisons has been a subject of financial analysis, particularly regarding how the Competition and Markets Authority (CMA) would view such a consolidation. Proponents of the deal likely argued that a combined entity would not pose an immediate threat to the market dominance of Tesco, which holds a 27.8% market share. By comparison, Sainsbury’s holds approximately 15.2% and Morrisons holds 8.4%, meaning a merger would create a combined entity with a smaller footprint than the current market leader.

However, the fact that these talks were ultimately aborted suggests that the companies faced significant hurdles in convincing regulators that the move would not harm competition. While the math regarding market share might seem straightforward, the CMA often examines local-level competition and the impact on supply chains, which can complicate large-scale retail mergers. The Guardian notes that the companies would not have initiated the talks if they did not believe a case could be made, yet the failure of the negotiations highlights the difficulty of navigating UK antitrust oversight in the grocery sector.