Ask a greengrocer in outer Melbourne why his margins keep thinning even as his shelf prices climb, and he won’t mention australia grocery duopoly prices as some abstract policy problem, he’ll point to the wholesale invoice on his desk and the two chains up the road that set the market whether he likes it or not. That’s the texture most coverage of this loses. Coles and Woolworths together ring up something like two in every three grocery dollars spent in this country, and that concentration doesn’t stay contained to supermarket aisles, it ripples back through supplier contracts and forward into every trolley. Whether that matters isn’t really in dispute anymore. The ACCC has already answered that one. What’s still genuinely contested is what, if anything, actually fixes it.
the numbers behind the duopoly
Start with the headline figure, because it’s the one that gets quoted and it undersells the point rather than overselling it. Two in three grocery dollars. That’s not market share in the way a beverage brand might claim market share, fifteen per cent here, twenty there, fighting for shelf space against a dozen credible rivals. It’s two companies effectively setting the terms for an entire category of household spending, and it holds true whether you’re in a capital city with four supermarkets on one strip or a regional town with exactly one.
The ACCC’s own supermarkets inquiry concluded the market structure blunts competitive pressure on prices, which is a more precise claim than it sounds. It doesn’t mean Coles and Woolworths are colluding, and the regulator didn’t find that. It means the conditions that would normally discipline pricing, a customer walking to a genuine rival when margins get greedy, mostly don’t exist in most postcodes. That’s the mechanism behind australia grocery duopoly prices running hotter than a textbook competitive market would predict, not a smoking gun, a structural absence.
The number worth sitting with longer than the headline share figure is what happens upstream. Suppliers negotiating with two buyers who between them control most of the shelf space aren’t negotiating from a position of strength, and that imbalance shows up eventually in what they can afford to plant, stock or pay their own staff. Concentration at the checkout and concentration at the loading dock are the same problem wearing two faces. The scale is the story. What’s contested is what to do about it.
why competition isn’t working
The ACCC’s own review answers the question its title poses bluntly enough. After examining the sector in detail, the regulator recommended a suite of supermarket reforms because the current structure blunts the kind of rivalry that would normally keep prices honest. That is not campaign language. It is the conclusion of the body whose job is to decide whether markets are working.
The mechanism is duller than “collusion” and more durable. With two chains controlling most of the shelf space, each one’s pricing decisions are watched closely by the other, and neither has much reason to break ranks and chase share on price alone. Economists call this tacit coordination, no phone calls required, no meetings in car parks. The two players simply know that undercutting invites a response that erodes the gain. A market can look competitive on paper, plenty of stores, plenty of brands on the shelf, while behaving nothing like one where either firm has to fight for a customer’s loyalty.
Australia grocery duopoly prices reflect that dynamic more than any single villain. Loyalty programs, house brands and store layouts are genuinely different between the two chains. But the incentive to compete hard on the number that matters most, the price at the till, is weaker than it would be with five serious rivals instead of two. New entrants exist, and some are growing, but building the distribution network and supplier relationships needed to challenge at scale takes years, and the incumbents’ existing scale is precisely what makes that catch-up so hard. The problem isn’t that competition has vanished. It’s that it survives in the places that matter least to the household budget.
what’s actually changing
The regulatory response to all this has been slower than the public appetite for one, but it has arrived, and it’s more targeted than the “break them up” instinct most consumers reach for first. The food and grocery code of conduct, which governed how supermarkets deal with suppliers, used to be voluntary. Woolworths and Coles could sign up to it and then largely mark their own homework. That’s changing. The ACCC’s 2024 inquiry into supermarket pricing recommended making the code mandatory, with real penalties attached, specifically because a voluntary code did little to shift the bargaining leverage that sits with two buyers facing thousands of suppliers who can’t easily walk away.
Merger control is tightening too. A new regime gives the ACCC stronger powers to block acquisitions that would let either chain buy up local competition before it becomes a genuine threat, rather than relying on after-the-fact enforcement once the deal is done and the damage baked in. There’s also a prohibition on excessive pricing making its way through the reform pipeline, aimed less at any single price rise and more at conduct that exploits the absence of a real competitive check.
None of this is about splitting Woolworths and Coles into smaller companies. It’s a set of narrower interventions aimed at the two chokepoints where the duopoly’s power actually bites: how suppliers get treated, and how the next serious rival gets strangled before it can scale. That’s a deliberately less satisfying answer than divestiture, and it’s worth sitting with why regulators keep landing on it anyway when they’re asked what would actually move australia grocery duopoly prices.
the unresolved reform fight
Here is the thing nobody wants to hear at a public hearing: the ACCC studied the market and did not recommend breaking up Woolworths and Coles. It recommended a mandatory code of conduct, tougher merger scrutiny, and a new prohibition on excessive pricing, and it explained, at length, why divestiture was the option it kept setting aside (accc.gov.au).
That is not a satisfying answer if your working theory is that two companies got too big and the fix is to make them smaller. But the regulator’s logic is worth taking seriously rather than dismissing as timidity. Forcing a sale of stores does not automatically create a viable third player. It creates orphaned assets that the remaining incumbents, or private equity, can pick up cheaply, often without shifting the underlying economics of supply, logistics, and shelf space that let the duopoly dominate in the first place. The chokepoints are contractual and behavioural, not just structural, which is why the reform package targets supplier treatment and merger approval rather than store count.
That argument has not settled anything politically. The Senate inquiry into supermarket prices heard plenty of testimony pushing back on the ACCC’s caution, and the pressure for something more visibly punitive has not gone away (aph.gov.au). This is where australia grocery duopoly prices debates tend to stall: consumers want a fix that feels proportionate to the frustration, and the fix on offer is a set of procedural constraints that will take years to show up in a shopping trolley, if they show up at all. Both things can be true. The reforms are better targeted than divestiture, and they are also slower and less legible than the public appetite for punishment.
General information only. This article is for informational and educational purposes and represents the author’s analysis based on publicly available information. It does not constitute financial, investment, or business advice. Readers should seek independent professional advice before making any business or financial decisions.
Closing / key takeaways
The duopoly is not a myth invented by people who dislike big business. It is a structural feature of the market that the ACCC itself has documented, and it genuinely blunts the competitive pressure that would otherwise discipline prices and supplier terms. But the fix most people reach for first, break them up, is the one option the regulator has consistently declined to recommend, because divestiture is slow, legally fraught, and no guarantee of new entrants filling the gap. Australia grocery duopoly prices respond more reliably to a mandatory Code, tighter merger control, and price-gouging rules than to a courtroom fight over asset sales.
Key takeaways:
- Market concentration is real, evidenced, and costly to consumers and suppliers.
- Divestiture polls well but hasn’t earned regulator support.
- Structural reform beats structural punishment, for now.
General information only. This article is for informational and educational purposes and represents the author’s analysis based on publicly available information. It does not constitute financial, investment, or business advice. Readers should seek independent professional advice before making any business or financial decisions.
Frequently Asked Questions
Why hasn't the ACCC recommended breaking up Coles and Woolworths?
The ACCC's 2024 supermarkets inquiry looked at divestiture directly and declined to recommend it. The concern was less about principle and more about mechanics: forcing a sale creates a fire sale, and fire sales tend to be bought cheaply by existing players or private equity, not new independent entrants. There's also no guarantee a divested store network would be viable on its own, given how much of a supermarket's cost advantage comes from scale in logistics and buying power rather than the individual site. The regulator preferred remedies that constrain behaviour rather than restructure ownership. That's a narrower, less satisfying answer than "break them up," but it reflects what the ACCC's own analysis found would actually work, rather than what would simply feel like justice.
Does the duopoly actually make groceries more expensive?
The ACCC's findings say yes, with caveats. Its inquiry found supermarket margins had grown over the past five years and that the concentrated structure blunts the intensity of price competition compared with more contestable markets. That's not the same as proving any single price rise was engineered. Input costs, energy, freight and wages all moved sharply in the same period, and separating structural effect from genuine cost pass-through is genuinely difficult. What the evidence supports is a milder claim: concentration removes some of the competitive pressure that would otherwise squeeze margins back down. Worth noting because it's more defensible than "prices are inflated by design," and it's still a real cost to consumers.
What does the mandatory Food and Grocery Code actually change?
Until 2025 the Code was voluntary, and both major chains signed up voluntarily, which tells you something about how much bite it had. Making it mandatory, with penalties for breaches, targets the supplier side of the relationship rather than the shelf price directly. Suppliers negotiating with a buyer that takes roughly two in every three grocery dollars spent in Australia have limited leverage, and unfair terms on that side tend to flow through to what gets stocked, at what cost, and eventually to consumers. It's a slower, less visible reform than a headline price cap, but it addresses where the bargaining power imbalance actually sits.
Will the incoming excessive pricing prohibition bring prices down?
It's genuinely too early to say with confidence, and any answer claiming otherwise is overstating what's known. The prohibition targets pricing that reflects market power rather than cost, which is a harder thing to prove in court than it sounds in a press release. Its effect will likely show up less as dramatic price cuts and more as a change in how confidently the major chains price near the ceiling of what the market will bear. Regulators overseas with comparable powers have used them sparingly. It's a meaningful addition to the toolkit, not a silver bullet, and treating it as one risks disappointment when the first cases take years to resolve.
General information only. This article is for informational and educational purposes and represents the author's analysis based on publicly available information. It does not constitute financial, investment, or business advice. Readers should seek independent professional advice before making any business or financial decisions.
