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SO you personally go around checking and comparing the prices on thousands of items at various grocery stores?

One of the biggest cognitive fallacies of the human brain is thinking that you can accurately aggregate and compare prices in this manner. Its one of the reasons that airplane tickets are sold the way they are.

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They did ask for a citation. They asked for an analysis of the data.

They just also gave their impression. They didn't imply that it was a comprehensive study or scientific.

And they're right to ask. They shouldn't believe something just because someone said it on the internet.

Another cognitive fallacy is confirmation bias...

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