Every store has their branded option and in some cases like TJs it's almost all their stuff. So even if there's only 2 name brands there's lots of options. An

Every store has their branded option and in some cases like TJs it's almost all their stuff. So even if there's only 2 name brands there's lots of options. And companies don't compete solely against existing companies. They compete against the possibility of new entrants. So a duopoly can't price much higher than the cost of a couple of their customers getting together to launch a competitor. Anecdatally what I've noticed is that branded food has increased much faster than bulk or generic items. But that's not really a bad thing. That's market dynamics rewarding a company for being good at what they do.