This video by More Perfect Union talks about them at length. If I remember right, it is literally required by law to be cheaper overall (25% savings across the board) with a default pricing of cost plus 1% and a variable pricing model where common staples like eggs and milk are sold at a loss and it's made up for on more niche items. They're tax-subsidized through the military, and it's an incredibly tiny portion of the budget. Some locations operate at a loss but they're not allowed to close any stores so that's why they need the subsidies.
So in short, yes, government run shops are cheaper because they're tax-subsidized, and are not required to profit or even break even. Personally I don't see any problem with government operating grocery stores at a loss to provide the working class with affordable groceries and having the rich foot the bill. In fact, I'd say that's the whole point.








Plenty of species self-destruct. The difference with humans is that we're aware of our own self-destruction and are continuing it anyway.