Tesco and Sainsbury's are facing renewed political scrutiny over supermarket pricing after Chancellor John Healey warned the government is watching fuel and till prices closely.
The warning follows Greater Manchester Mayor Andy Burnham's pledge to crack down on consumer rip-offs, raising concern that the upcoming Budget could include measures targeting Britain's £196billion grocery sector.
The political debate has put stock-market quoted chains Tesco, Sainsbury's and Marks & Spencer under the spotlight, as politicians question whether store loyalty schemes offer genuine savings or misleading discounts to shoppers.
Tesco relies heavily on its Clubcard scheme to maintain market dominance, while Sainsbury's uses its Nectar programme to retain customer loyalty.
The latest accusations of price-gouging originate from Giles Hurley, chief executive of Aldi, the privately-owned German discount chain that does not operate a customer loyalty scheme.
This pricing controversy comes on the fifth anniversary of the cost of living crisis, which began in August 2021 when UK inflation jumped to 3.2 per cent before peaking at 11 per cent in October 2022.
While the overall inflation rate has fallen to 2.9 per cent and food inflation has eased to 1.3 per cent, rising energy costs and summer droughts across Britain and Europe threaten to cause crop shortages that could push shelf prices back up.
Supermarket pricing in the United Kingdom is measured by official inflation metrics, tracking consumer cost movements across food staples and household goods.
Pricing accusations and inflation context
Retail analyst Clive Black of Shore Capital defended listed grocers, pointing out that despite their size, profit margins remain exceptionally low across the industry.
Tesco operates on a profit margin of just 4.3 per cent, which chief executive Ken Murphy attributes to an "intensely competitive market" where chains fight relentlessly for shoppers.
Black said supermarkets are supporting households by "absorbing undoubted cost pressures" and argued that the government should recognise that British consumers are paying too little for food rather than being swindled.
Previous government attempts to intervene in retail pricing faced strong pushback, as former chancellor Rachel Reeves abandoned plans for price caps on milk, eggs and bread following warnings from the Bank of England and retailers.
Stuart Machin, chief executive of Marks & Spencer, described proposed price caps as "completely preposterous" and disclosed that M&S loses money on basic items like milk at "a negative 7 per cent margin."
Analyst defense and profit margins
Investors can draw reassurance from a 2023 investigation by the Competition and Markets Authority, which found no evidence of profiteering in the UK supermarket sector.
Susannah Streeter of the Wealth Club noted that any reopened probe would struggle to find evidence of price-gouging given thin margins, though she warned Aldi has little to lose by claiming the moral high ground.
Streeter added that if Tesco and Sainsbury's are forced into a high-profile public debate to defend their discounts, growing customer suspicion could hurt sales and share prices.
Lale Akoner, global strategist at eToro, noted that grocers face growing pressure to suppress prices even as overheads like wages and energy escalate.
Regulatory history and market risks
Tesco remains the titan of the UK grocery market, valued at £27.7billion with a 28.5 per cent market share.
The retailer owns wholesaler Booker and operates 560 central European stores, though potential sell-offs of its European operations could signal an end to its international expansion plans.
Tesco shares currently trade at 446p, down 10 per cent over the past six months due to drought concerns, though well above the 169p low reached during its 2014 accounting scandal.
Analysts maintain an average target price of 550p for Tesco shares, with Bank of America expecting the chain to take market share from structurally weaker competitors like Morrisons, while Clive Black considers the shares fairly valued.
Tesco also benefits from its F&F clothing line, its Finest premium food range and wholesale scale through Booker.
Tesco market position and share outlook
Sainsbury's holds second place in the market with a 15.2 per cent share, ahead of Asda at 11.5 per cent, Aldi at 10.7 per cent, Lidl at 8.8 per cent and Morrisons at 8.5 per cent.
The £7.2billion company plans to sell its Argos homeware division next February to focus on a "food first" strategy, ending its attempts to operate as a multi-product retailer.
Shares in Sainsbury's stand at 336p with two analyst buy ratings, amid speculation that chief executive Simon Roberts could seek to acquire private equity-owned Morrisons after a 2018 bid for Asda was blocked by regulators.
Sainsbury's and Marks & Spencer performance
Marks & Spencer has become the fastest-growing grocery retailer with a 4.5 per cent market share, boosted by a 16 per cent sales surge in the four weeks to August 9.
The £8.07billion retailer saw strong demand for its re-styled Sparks loyalty scheme and "picky bits" summer snack ranges, pushing its shares up 17 per cent this year to 384p with an average analyst target price of 437p.
