Part of this is overregulation, with zoning and planning departments enacting policies that make smaller retail spaces less attractive to builders and owners, leading to a low supply, and allowing egregious rent for well located small retail.
Yes, economies of scale likely mean that larger businesses can afford lower prices, but smaller businesses also get to avoid some costs (no large administrative corporate departments necessary for a one-location bodega), so the prices probably don't need to be as far apart as they are.
That’s not really responsive to my concerns about Robinson-Patman.
A world where it’s enforced uniformly and strictly might have some local benefits, but getting the government involved in regulating every wholesale transaction for “fairness” is a recipe for stagnation, corruption, or more likely both.
It is responsive to your question on why the government should have something to say about price negotiations between producers and retailers of frozen pizzas.
Government overreach X is good because in a sea of bad consequences, a few good things happen, too?
It’s much better for governments to be principled, and only interfere with mutually voluntary engagements by citizens when there’s an urgent harm to remedy.
All grocery stores close at 10 here (Ireland) but yes you are right. My local centra, 1km away is used for cheese, milk and beer runs. Everything else I get at the big lidl 15km away.
This is the ideal situation, and common in most west cost dense areas, but not true for every dense mixed use area. Specifically it's common in low-income high-density housing to not have sufficient super market coverage.
Price conscious buyers will opt to drive to the bigger, farther away store because it has more variety, and the essentials are cheaper.
I know I do this.