It sounds like a math problem for a college entrance exam: If Shopper X has Y amount of dollars to spend on groceries, how will she choose to distribute it among Retailers A, B and C when the cost of food and gas have increased Z percent? Throw in all the various permutations about the proximity of the retailers and their variability in pricing and selection, and it becomes an even more complex calculation. Increasingly, according to data provided to SN by Chicago-based Information ...

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