I am with the others.
I only know my country and I have my own personal things but normal, simple food sounds the cheapest, processed stuff is usually more expensive…? Maybe not always but then it’s mostly useless, it couldn’t satiate me or it isn’t nutritious so no point in eating it.
If I was SUPER poor for a while (I am quite poor but still have like $5-$6 a day for food - but it’s Hungary so the currency is different and many other things as well -, WAY less for anything else actually, food is my priority… And that’s plenty on carnivore, meat can be very affordable and quite useful without zillion addition, vegs are usually expensive while being useless joy things probably no one can satiated with, I mean the normal lowish-carb things here, not the starchy ones, grains are somewhat expensive at this point while being useless to me, I would just get hungrier…). Only gluten (expensive but protein rich) and dry legumes (cheap for its value and satiation level) could win over my carni food, partially. So I would eat meat, eggs, little dairy, legumes and gluten (and fruit from my garden) if I had a super little food money for a while (not long term, just kill me then). And maybe some extended fasting, I have some fat to lose…
I see that “oh they are poor, can’t do better” but I almost never agree. I see this when people “cook” something horrid. Poor people still can cook some traditional food looking thing, cabbage, split pea and chicken frame costs almost nothing… One can make a subpar but not super bad meal from those. Or maybe even a nice satiating meal, it depends on the person. Many people, even poor ones just can’t figure out what is worth it, they have some weird ideas and use too expensive ingredients sometimes… Like butter or pasta. Especially in the worst war times, our neighbour’s situation very seriously affected our prices for some food groups for some reason. Then we got the unheard of, borderline miracle things: the prices dropped for those food groups. Of course they still stayed higher than before but it was our normal high inflation, not the sudden doubling of prices in a year. Even our inflation isn’t THAT high, not even for the worst groups.
But I digress, sorry.
I am pretty sure I could eat cheap using normal ingredients (I mean, not processed. but I use processed items, they are useful, I am very choosy and the amount is small though as I just don’t desire more) in many places of the world. I would need a bigger budget in some countries where meat is very expensive. Some places have availability problems. But people just can’t spend their money well, it’s everywhere… I am pretty good at that I dare say. But thankfully never had to test how good I really am. I would lose my will to leave below what I have (that’s quite nice. I can’t afford ruminant meat but it’s not a problem. and I do buy a bit every 2 months or something. fish is similar, other seafood is out. but pork, my absolute fav is affordable
well, my fav items are. in the right place, on sale).
IDK how things are elsewhere but we have so much so great sales that I almost exclusively buy food on sale. Green ham is an exception but it had a goverment price cap and it just… Stayed there. Yay. But turkey is even cheaper and super tasty… I am glad I don’t need to buy expensive and useless plants anymore, it spares me time and effort as well 
But one can buy cheap vegs, we only buy that kind (no matter how much money we have, it makes no sense to pay more for vegs that we need in bigger amounts than for meat that is actual good food all alone, protein, satiation and everything). My SO couldn’t afford a carnivore diet but he couldn’t do low-carb anyway and a carby food satiates him very well and longer term. He buys plants smartly and enjoys his food. So it’s individual.
Personal sensitivity and extra rules can make our diet pricier, of course. We are lucky.
What I don’t get why people consider food expensive even when their income is high enough that food cost is a teeny-tiny part of it. They must have a reason, at least sometimes. Whatever.
I have not much problem with the prices of my food. I do have problems when it comes to certain items but they are luxury items so I can live without them just fine.
The really expensive thing is restaurants, probably (couldn’t afford one since many years and never was into it much. it’s fun here and there but I normally prefer my own cooking). Or buying ready to drink coffee, oh that can be pricy. Or overprocessed overpriced snacks. Yeah, there are some outrageous prices but as long as I can get my staple items on okay prices, I am fine.
Yeah, that happens to us too. But we have big city shoppings (multiple supermarkets, buying food for weeks) and I just can’t update inflating staple food prices in my mind… Prices are 100 times bigger than in my childhood… The ones I remember (ice cream and crescent roll).
But I have read in the carnivore topic a few times how quickly prices can go up in the US too. So I easily can imagine getting a shock sometimes.
I wrote this in too many words again. Sigh.