Mark Cuban Questions Whether Mamdani’s Discount Grocery Stores Can Break Even

Mark Cuban is questioning whether New York City Mayor Zohran Mamdani's plan to sell essential groceries at a 30% discount can work without taxpayers eventually covering the difference.

The billionaire investor and former "Shark Tank" star turned to AI chatbot Grok to test the numbers behind Mamdani's planned city-owned grocery stores, focusing on the margins needed to cover operating costs while still offering steep discounts to help New Yorkers save on groceries.

What Mamdani's grocery plan would do

Mamdani's administration plans to open five municipal grocery stores, one in each borough, with the first expected to open in Hunts Point in the Bronx by the end of 2027. All five are expected to be operating by 2029.

A core basket of groceries will be priced 30% below typical New York City retail prices, including all fresh produce, meat, and seafood, plus around 20 categories of staples such as eggs, milk, cheese, bread, rice, and pasta.

Mark Cuban puts the 30% discount to the test

Cuban questioned whether grocery margins leave enough room to make those discounts financially sustainable. In a post on X, he asked Grok which grocery products carry gross margins of 70% or more that could support a 30% discount. He then asked how large a store selling those products would need to be and what it would cost to operate before accounting for employees and benefits.

Grok responded that almost no grocery categories consistently achieve margins that high. It estimated that a store focused on higher-margin products might require around 2,000 to 5,000 square feet, with annual operating expenses excluding labor and benefits running around $25 to $55 per square foot.

Cuban asks Grok how NYC stores would break even

Cuban followed up by asking Grok to calculate the sales a store of that size would need to break even at a 15% margin.

The basic math illustrates why margins matter so much. If annual non-labor operating costs were $100,000, for example, a store operating at a 15% gross margin would need roughly $667,000 in sales just to cover those expenses. Once wages, benefits, inventory losses, and other costs are included, the required sales would be considerably higher.

Mamdani's model, however, isn't structured exactly like a conventional privately owned supermarket. The city will own or lease the locations and cover certain real estate costs, while private operators selected through a request-for-proposals process will handle day-to-day operations, including staffing, merchandising, and loss prevention.

By removing some costs that private supermarkets normally have to absorb, the model could give operators more room to charge lower prices.

New Yorkers could save around $1,000 a year

The potential upside for shoppers is significant if the city's projections hold. Mamdani's administration estimates that discounting the core basket by 30% would reduce an average shopper's overall grocery bill by about 15%.

City Hall estimates the resulting savings could reach around $90 per month, or roughly $1,000 per year. The discounts will also be available regardless of income, rather than being limited to lower-income households.

City officials say the intervention is warranted because grocery prices nationwide have climbed 33% since 2019, while more than 40% of New York City families struggle to afford food.

New York is putting $70 million behind the stores

Mamdani has allocated $70 million in the city's capital budget to develop the five-store network in partnership with the New York City Economic Development Corporation.

Spread evenly, that would amount to around $14 million in capital funding per store, although actual spending will depend on individual locations and development costs.

However, capital spending doesn't necessarily answer the longer-term question Cuban is raising.

Building and opening the stores is one expense; keeping them financially sustainable year after year is another.

Kevin O'Leary says taxpayers could cover the losses

Cuban isn't the only "Shark Tank" name skeptical of the economics behind the stores. Kevin O'Leary, Cuban's former co-star on the show, has been considerably more critical, arguing that conventional supermarket margins make the promised discount unsustainable without subsidies.

Cuban largely framed his comments as questions about margins, store size, and break-even sales, while O'Leary argued that the model would leave taxpayers paying the difference.

"Margins in grocery are 2-3% pre-tax margins so reducing selling prices by 30% across the board will guarantee that the stores will lose money on every sale," O'Leary wrote on X. "Who will pay for those losses? You the NYC taxpayers."

However, the city's proposal does not call for a 30% discount across every product in the stores. The reduction applies to the designated basket of essential groceries.

Bottom line

Cuban's questions highlight the central financial challenge facing Mamdani's municipal grocery plan: selling essential foods at a 30% discount is only sustainable if the stores bring in enough revenue to cover their remaining expenses.

New York is betting $70 million in capital funding and significant city-covered overhead on making the model work. Shoppers could save around $90 a month if the city's projections hold, which may sound attractive to families trying to save money on bills, but any persistent operating shortfall could ultimately require additional taxpayer support.

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