Including their brandname chains:
Yes there are other big oligopoly chains like metro, Sobeys/Safeway, Pattison, but I think it’s best to start with one major chain to see how much coordinated action can affect them.
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None of the grocery stores or drug stores in my town are associated with Loblaws and the one grocery store on my way home from work is Costco, so I already don’t shop at Loblaws 99%+ of the time.
However if I’m out and about I’m not going out of my way to avoid it.