The three biggest retailers by revenue in the U.S.— Costco Walmart and Amazon —accounted for about 11% of total retail sales back in 2014, based on their reported figures measured against national retail sales data from the Commerce Department. In their last three reported quarters, the behemoths selling everything from groceries to appliances made up about 17% of retail sales and roughly 57% of retail sales growth over that period. Grocery stores accounted for about two-thirds of food-at-home spending in the U.S. in 2000, but their share shrank to 54% in 2023, according to the U.S. Department of Agriculture.
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