Stolen from Reddit
https://www.reddit.com/r/dataisbeautiful/comments/1ftmkwt/oc_foods_cost_vs_caloric_density/
But I loved it. Also this has Shrimp removed, because it was on the OG chart due to an error and this is an updated version.
EDIT: Here is one for protein! https://www.reddit.com/r/budgetfood/comments/1fp2ytb/foods_cost_per_gram_of_protein_vs_protein_density/#lightbox
Let's call out complete proteins too. Otherwise you still have to mix and match food sources. Soy would probably win.
It depends on the country for soy. Objectively in the absence of interference, it's cheaper and still relatively complete.
But for whatever reason, a lot of Western governments like the US and Australia heavily subsidise animal proteins, so I think in those regions WPC still has a slight edge.
Then again a lot of people struggle with lactose And soy is probably cheaper than WPI.
Gainz is work haha.