There doesn't seem to be any rivalry between different supermarkets unlike in the West where different supermarkets are known for their unique variety of products. Either all supermarkets are owned by the same family or they are in collusion with each other because they know that customers have no other choice. The only thing that may change this situation is if everyone writes to the head offices and sends a letter of complaint. Filipinos will never complain, its not in their culture but that's a reason why things are the way they are. It's up to foreigners to teach them something or nothing will ever change.