"We're talking about a target group that really needs it, and a target group that is really proud and eager to stay on their own feet," she tells The Salt.

She calls the stores a "win-win-win" for everyone involved: manufacturers and retailers, customers, and the nonprofits that typically run the social supermarkets. The environment also benefits, since less food ends up in landfills.

"I've never seen any disadvantage if it's implemented the proper way," she says. "It also helps society to reduce its welfare costs."

The social supermarket model has flourished in Europe since the 2008 economic downturn. Holweg says there are now about 1,000 stores spread across the continent, including France, Austria, Belgium, Luxemborg, Romania and Switzerland. Though it may seem counter-intuitive, Holweg thinks a key reason the model works so well is that the stores don't give away food. Customers have a choice while shopping, even if the prices are symbolic.

"They are still treated as a customer. They can even return or exchange a product if it's not good," she says. "And this, to me, makes a major difference."

In addition to cutting down their grocery bills, customers can take classes on cooking, budgeting, resume writing and more. Stores periodically review memberships, and Holweg says the goal is to help get customers out of poverty and on their way back to shopping at traditional grocery stores.

The social supermarkets themselves are not designed to be one-stop shopping in the first place: Because of how they stock their shelves, selection could differ widely from one visit to another. For example, oil, butter and flour can be hard to come by.

The U.K. store — Community Shop — is a subsidiary of the British Company Shop, a commercial firm that redistributes surplus food and goods, and will be stocked with donations from major retailers and manufacturers. Sarah Dunwell, Company Shop's director of environment and social affairs, says the stores are a way to be kind to both people and the environment.

"Industry surplus is hard to avoid, but what Community Shop shows is that if we all work together, we can make sure that surplus food delivers lasting social good," Dunwell said in a statement.

If the location in South Yorkshire proves successful, Company Shop hopes to replicate the social supermarket model in London and other cities next year. And with 4 million people without enough food in the U.K., there may be plenty of opportunity.

Copyright 2013 NPR.

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Social Supermarkets A 'Win-Win-Win' For Europe's Poor