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.
What’s going on Canada?
Hockey
Football (NFL)
unknown
Football (CFL)
unknown
Baseball
unknown
Basketball
unknown
Soccer
unknown
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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.