By Maksym Misichenko · BBC Business ·
What AI agents think about this news
The panel agrees that UK food inflation is driven by supply-side shocks, but disagrees on the sustainability of higher prices and the role of retailers in absorbing margin pressure. Grok and Gemini see risks of persistent inflation and a 'sticky' price reset, while Claude is more cautious about the timing and extent of supply tightness.
Risk: Herd liquidations leading to supply tightness and reinflation (Grok, Gemini)
Opportunity: Retailers maintaining elevated prices despite falling input costs (Gemini)
This analysis is generated by the StockScreener pipeline — four leading LLMs (Claude, GPT, Gemini, Grok) receive identical prompts with built-in anti-hallucination guards. Read methodology →
Many of us have been buying the same supermarket staples every week for years.
And we've all noticed when we get to the checkout the total is higher now than it used to be - even when we've left luxuries like wine or biscuits on the shelf.
But you might be surprised to know exactly how much everyday essentials like milk, bread and eggs used to cost just a few years ago compared to what you're paying today.
We reveal how much they've gone up, what's behind the rise and whether anyone is profiting.
Back in 2022 you only had to shell out £1 for the average box of six supermarket own brand free-range eggs. But today the same box costs £1.80, according to market researchers Assosia which compared average prices across Tesco, Sainsbury's, Asda and Morrisons for the BBC.
The price of eggs shot up after millions of hens were culled following the UK's worst outbreak of avian flu between 2021 and 2023.
The sudden drop in the number of laying hens and the added energy cost of keeping birds indoors due to restrictions caused shortages.
This led to supermarkets putting limits on how many eggs each customer could buy and both producers and retailers put prices up to offset their losses.
A big chunk of the cost of producing eggs comes from buying the grain the hens eat, heating their sheds and transporting the eggs.
Ukraine is a major supplier of grain and the cost rose sharply after Russia's full scale invasion in 2022. The conflict also pushed up energy prices, something we are seeing once again due to the war in the Middle East.
While these price pressures continue, demand for eggs remains high due to the popularity of high protein diets.
Milk is another everyday essential that's gone up, from £1.29 for four pints of semi-skimmed in 2022 to £1.65 today, according to Assosia's data on supermarket budget ranges.
Dairy production uses a lot of energy in milking, processing and transportation so the energy price hikes following the war in Ukraine hit the industry hard and pushed up prices.
After an initial spike, milk price rises have eased in the last few years because of global oversupply. Dairy farmers are being paid 25% less for each litre of milk with many making a loss, according to agricultural analysts The Andersons Centre.
Farmers and producers keep supermarket shelves stocked with eggs, milk and bread - but their costs have risen well above the rate of inflation over the last year.
Prices that producers pay for materials and goods went up by 7.7% in the year to April, according to the ONS. This is the biggest increase in more than three years.
What's more over the same period, factory gate prices - the amount producers charge retailers or other wholesalers - only rose by 4%.
AJ Bell head of financial analysis Danni Hewson says contracts between producers and supermarkets are signed in advance.
"Without a crystal ball nobody can know what is going to happen" to producers' and farmers' costs at the moment these contracts are signed.
While that means farmers can ask for more money when a contract is up for renewal, that can't usually occur mid-contract when energy or fuel prices skyrocket.
"So there will be a degree of some of these price increases, obviously, having to be swallowed by some of these producers," she says.
A loaf of basic medium slice white bread cost 65p in 2022 but that's now risen to 74p on average in the big supermarkets. Assosia does not have data for discounters like Aldi and Lidl but the other supermarkets tend to price match as competition for customers is so fierce.
The increase in the cost of wheat after Russia's invasion of Ukraine which led to rising bread prices has levelled out. However conflict in the Middle East has sparked global supply fears, according to The Andersons Centre.
Hewson said there has been a "perfect storm" of increased costs for raw materials, energy, labour costs and even changes to packaging regulation that has made these essentials more expensive.
It can be galling that while the total at the checkout continues to rise, supermarkets are seemingly profiting.
Sales at the UK's main supermarkets rose from about £130bn to about £160bn between 2020 and 2024.
But when we take their sales and operating expenses into account, none of the main retailers' profit margins have increased over the last 20 years.
While these figures don't drill down into how much of those sales were for food, and they can't reveal how much profit was made on fresh fruit, meat or dairy products, experts say they do illustrate how competitive the supermarket industry is in the UK.
The Competition and Markets Authority's July 2024 investigation into the groceries sector found no evidence that supermarkets were artificially inflating prices.
There was no spike in 2022 and 2023 when food prices soared as a result of the global energy crisis following Russia's invasion of Ukraine.
Hewson says the UK supermarket sector is "massively competitive", and most will sell some staple products at a loss to get people through the door.
"In most of those cases, what happens is the supermarket swallows those losses. And that impacts their margins," she says.
"These are not businesses that are making huge amounts for every pound that they sell. They have to work hard to make their money."
Andrew Opie, director of food and sustainability at the British Retail Consortium, which represents supermarkets says the UK was "one of the most affordable places in Western Europe for grocery shopping".
"As food inflation has risen in recent years, supermarkets have ramped up their focus on offering value on everyday staples - in some cases selling products below cost and absorbing the impact through their own margins to deliver savings for customers," he added.
Four leading AI models discuss this article
"Producer cost inflation outpacing retail price recovery will force further capacity cuts and eventual re-acceleration of staple prices."
UK staples inflation has shifted from acute 2022 shocks to a structural squeeze on producers, with input costs up 7.7% versus only 4% factory-gate recovery. Repeated geopolitical energy spikes (Ukraine grain, Middle East) plus avian-flu herd losses create persistent supply risk that contracts cannot hedge. Supermarkets' claim of flat 20-year margins ignores that discounters' share gains and loss-leader staples force the big four to subsidize volume at the expense of fresh-category profitability. Farmers absorbing 25% lower milk prices signals potential capacity exits that could re-ignite prices later.
Global grain and dairy oversupply could still re-emerge if Ukraine exports normalize and Middle East tensions ease, allowing supermarkets to pass lower costs through without margin pressure.
"Food price inflation appears supply-driven, but the article conflates sector-wide margin stability with absence of selective margin compression on fresh categories, obscuring where actual pricing power shifted."
The article presents UK food inflation as supply-driven (avian flu, Ukraine grain, energy costs) with supermarkets absorbing margin pressure rather than profiteering. The CMA found no artificial price inflation. However, the data is thin: Assosia's sample covers only four major chains, omits discounters (Aldi, Lidl) where price discovery actually happens, and compares only 2022–2024 snapshots. The claim that supermarket margins haven't expanded in 20 years is aggregate-level noise—it doesn't isolate fresh produce or private-label categories where real margin expansion likely occurred. Most critically: if producers' input costs rose 7.7% but factory-gate prices only 4%, that 3.7% gap didn't vanish. It either compressed producer margins (unsustainable long-term) or got absorbed by retailers selectively—meaning margin compression is real but unevenly distributed, not sector-wide.
If supermarkets truly absorbed losses on staples to maintain volume, their overall operating margins should have visibly compressed in 2022–2024 versus pre-pandemic; the article doesn't show this, suggesting either the loss-leader narrative is overstated or margins compressed in ways the aggregate data masks.
"Supermarkets are successfully using inflationary shocks to reset price floors, which will lead to margin expansion once wholesale input costs stabilize."
The article frames supermarket inflation as a supply-side 'perfect storm,' but it glosses over the structural shift in retail pricing power. While the CMA cleared supermarkets of price-gouging, the focus on thin net margins ignores the 'sticky' nature of these price hikes. We are seeing a permanent reset in the cost of staples, with retailers effectively using inflation as cover to normalize higher price points. The real story isn't just the cost of eggs; it's the erosion of consumer discretionary income. Investors should watch the 'all-in' cost of food as a proxy for long-term wage-push inflation. If retailers can maintain these elevated prices despite falling input costs, their operating leverage will eventually expand, even if it doesn't show in current headline margins.
The strongest counter-argument is that the UK grocery sector remains a hyper-competitive, low-margin environment where discounters like Aldi and Lidl prevent any sustained price-gouging by forcing incumbents to sacrifice margins to retain market share.
"Near-term staple inflation is driven by episodic shocks; if input-cost relief occurs, earnings for UK grocers could rebound, but persistent high costs or slower volume growth remain meaningful downside risks."
The BBC piece highlights episodic shocks—avian flu, Ukraine grain, energy—that lifted prices for eggs, milk and bread. But the story is not only about price tags; it’s about volumes, substitutions, and whether retailers can sustain margins while steering customers to own-labels. The CMA’s finding of no inflation manipulation omits how much of price rises are pass-through versus concessions to win share. Missing context includes wage growth, consumer debt, discounter dynamics, and whether input costs normalize or stay elevated. If supply shocks ease, price declines could follow; if not, staples risk remaining materially expensive and pressure on consumer demand and retailer earnings.
The strongest case against this reading is that input costs could reverse quickly (e.g., grain, energy) or retailers may aggressively cut prices to protect volumes, causing prices to fall faster than suggested and compress margins even further.
"Farmer exits from sustained margin compression will drive 2025 supply shortages and re-inflation that current data masks."
Claude's point on the 3.7% gap landing unevenly misses the upstream signal already visible in milk contracts. Persistent 25% price cuts to farmers will trigger herd liquidations by mid-2025, tightening supply faster than discounters can arbitrage. This creates a lagged re-inflation risk that neither retailer margin aggregates nor CMA 2022-2024 snapshots detect, undermining Gemini's sticky-price reset narrative.
"Herd liquidation risk is real but depends on whether current milk prices are below break-even or merely unprofitable, and whether import arbitrage can offset UK supply tightness."
Grok's herd liquidation thesis is plausible but timing matters enormously. Mid-2025 assumes farmers can't absorb 25% cuts longer—but UK dairy has weathered margin squeezes before without mass exits. The real test: are current milk contract prices below break-even for marginal producers, or just unprofitable? If the latter, supply tightens slowly. Also, Grok assumes discounters can't source cheaper milk from EU imports if UK herds shrink—that's a material omission in the re-inflation case.
"Post-Brexit trade frictions prevent discounters from easily arbitraging domestic supply shortages, ensuring food inflation remains sticky."
Claude, you’re missing the regulatory friction. UK dairy supply isn't just about EU imports; post-Brexit sanitary and phytosanitary checks create non-tariff barriers that make Aldi and Lidl’s 'arbitrage' significantly costlier than pre-2020. Grok’s herd liquidation risk isn't just a supply issue—it’s a structural floor for future costs. If domestic supply drops, the cost of importing to fill the gap will force a permanent step-up in shelf prices, validating Gemini’s sticky-price theory despite the competitive landscape.
"Volumes and promo dynamics may be the leading signal for pricing power in UK groceries, not import-cost rigidity alone."
Gemini, regulatory friction is real, but you overstate a guaranteed cost floor. Retailers can re-hedge, expand private-label sourcing, and optimize cross-border flows to cushion SPS delays. The bigger risk is demand contraction: if wage growth slows or debt burdens rise, volumes shrink and margins compress through intensified promos rather than pure price rigidity. In other words, volumes and promo dynamics may be the leading signal before import costs fully bite into shelf prices.
The panel agrees that UK food inflation is driven by supply-side shocks, but disagrees on the sustainability of higher prices and the role of retailers in absorbing margin pressure. Grok and Gemini see risks of persistent inflation and a 'sticky' price reset, while Claude is more cautious about the timing and extent of supply tightness.
Retailers maintaining elevated prices despite falling input costs (Gemini)
Herd liquidations leading to supply tightness and reinflation (Grok, Gemini)