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by ken 2744 days ago
My first guess would have been rice. Rice is super cheap. According to [1], it's oils and flours, followed closely by rice and sugar.

Butter is around $5/lb for 32 x 100-Kcal servings, so it's only around 640 Kcal/$. That would put it pretty far down the list, below milk and eggs, and on par with lentils.

[1]: https://efficiencyiseverything.com/the-highest-calorie-per-d...