Change the law that allows smaller supermarkets to charge more than larger ones

Petitions need to call on the Government or Parliament to take a specific action. We're not sure exactly what you'd like the Government or Parliament to do. We are unclear of the details of what you are asking for: whether you want a single price for a product across all shops, or whether you want to require companies to charge the same price for a product in all the shops they own regardless of their size (which could be different to other companies). You could start a new petition explaining clearly what you would like the Government or Parliament to do.