Others have pointed out, and I agree: supermarkets are a large factor here. The transition of American food shopping from a "market" pattern to a "supermarket" one has taken a heavy toll on food items that aren't true luxuries, but are effectively made into luxuries by failing to fit cleanly into supermarket-scaled supply chains.

We now spend less than (nearly) ever on food at home[1], in large part because we've eliminated the foodstuffs that can't be produced at the smallest possible margins.

[1]: https://www.ers.usda.gov/data-products/chart-gallery/gallery...