Look into fresh produce that you can eat raw. IMHO there's no nicer snack than a crisp crunchy carrot. They're cheap, and pretty much always available. Carry a mini peeler with you and you can just grab one from a store, peel it over a rubbish bin, and scoff it. :)
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Most things are unhealthy because we eat too much of it. For example (fresh) bread is delicious, cheap, and healthy, provided you eat it in moderation. Now if you ate nothing but bread all day you would gain a lot of weight.
Same goes for salt, fat, and sugar. To be fair, part of the reason we tend to eat so much of it is because normally this stuff is rare in nature and we are evolved to seek it, but we've made it so accessible and cheap, that we easily let our natural instincts take over. So that aspect explains your trinity. But it doesn't have to be that way. You can have all three with a bit of self control.
I don‘t know about economics, but this is my entry to research:
https://youtube.com/watch?v=0Xa7Dp3-eYA
And cucumber prices went up more than 50% for me in the last 2 years alone, so maybe you‘re onto something.
I think falafel and pita with all the veggies and sauces might be something that fits the bill that you can find easily.
Falafel is made of chickpeas which are healthy, but deep frying them isn't very good for you. Not too bad as long as you don't eat it all the time, but OP asked for healthy foods.
You have two tiny balls of falafel with huge serving of veggies, pita and veggies. I don't think it's particular unhealthy compared what people eat usually. You could of course airfry or bake the falafels if you want to avoid that as well.
Many have hinted toward it but there is no natural food that meet all three needs. To achieve that you need to mix up several foods.
Rice, Potatoes, and chicken are extremely cheap and probably your best bet.
imo it really depends on what you mean by "healthy", healthfulness is mostly found in the balance and portioning
Dates, maybe?
Sure can be cheap, delicious and healthy, but to be the three of these things at the same time is quite hard...
The one thing missing from the trinity is "effort". For instance, you could make any Dal, which would fit the trinity, but takes a lot of time. There are books with hundreds of Dal recipes that all taste different and work, too. And this is just one example. Less than a dollar a meal if made in bulk with rice.
Tinned tuna. Inexpensive, high in protein and fish oils, low in fat and calories.
Probably not great in huge quantities because of iodine, but generally very healthy