YMMV of course, doesn't mean that what I say is not true, neither I'm saying it's the same for all countries. In my supermarket (central EU) a kg of pepper is 3-4 Eur/kg, chicken breasts without bone are cca 4,50 Eur/kg, whole chicken is 2 - 3 Eur/kg. Not mentioning pepper is supposedly 94% water. I'm definitely going to be fed more times buying 1 kg chicken instead of vegetables.
Fresh vegetables are great but yes, mostly water. Beans, rice, lentils, grains (in dry form) cost less per kg than chicken, don't need refrigeration and will make many more meals.
As somebody who's also from the central EU, it feels like you are low-balling that price there. You would have to look really hard to find chicken breast as such a low kg price because the average is more like 5 €/kg usually higher [0].
Personally I wouldn't even buy such cheap poultry because with a price like that you can be very certain these animals must be farmed in rather "optimized" conditions. Just like with eggs or milk, these are items I'm willing to spend a bit of extra money to support better and more humane practices.
Trying to do the same with meat is very expensive, did it recently ordering turkey breast, ended up paying 8€ for 400g, thus I reserve it for special occasions.
In that context, your comparison between peppers and chicken breasts is also not that good. Peppers are a very bad vegetable source of proteins, to replace chicken breast one would eat something protein-rich, like beans and those happen to be dirt cheap pretty much everywhere, particularly when buying them in bulk and dried.
Seems like central EU is a very vague term. I meant Slovakia, you probably meant Germany. I don't really low-ball the price, I checked one of the supermarkets current weekly offer, 1kg Chicken breasts (standard quality, respected manufacturer) this week 4,29 E. [0]. You might argue that this is a special offer, but we have similar offer all the time in one of the different supermarkets around.
Your point with beans etc. is valid though. Just the fresh vegetables are very expensive here and feels almost like a luxury item.
