I feel like the impact would be shown best in the perishable items market such as Grocery. Or one time buys, like appliance sales and the like. Drug stores are also interesting because of the quick products they sell at the time of need. There is no consumer waiting a week for headache medicine. These type of markets would be the best scale for this type of study, but I have a bad feeling there is a massive amount of cherry-picking going on in all of them.
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