Four companies control two-thirds of Canada's grocery market. In the US, a third.
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Loblaw, Sobeys, Metro and Costco sell about 67% of Canada's groceries by a USDA estimate. The top four in the US sell 34.7%. See the market share gap.

Loblaw, Sobeys, Metro and Costco sell about 67 cents of every dollar Canadians spend on groceries, by a USDA estimate. The four biggest US food retailers sell about 35 cents.