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
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.