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Here's my take, having used this as an archaelogy (#pubarch) lesson many times before: the fridge quiz is bad for the thing NYT says it's for, but it's bad because our subjective assessments of economic, social, gender, and ethnic identity using groceries is very unreliable.
Exhibit 1: I've been teaching a #pubarch garbology lesson for about 7 years now and can only remember once where a team got close on those predictions. My colleague made the exercise with his university students, counting and listing their household garbage.
While someone's purchases/food/garbage may be informative about them & may reveal things they don't tell you (like how much cake they really eat) it isn't like you can just glance at a fridge or receipt and know the people of a household.
