I was in a mid range restaurant, certainly not fancy fancy, or dedicated to rich people, in the Lower East Side of NYC this week, and their steak was $97. This is not by any means an "expensive" restaurant in NYC.
BA is certainly getting ridiculously expensive, but the US started higher, and Trumponomics are keeping it well above Argentina.
McDonalds in Nyc is more than in BA. A slice of pizza is thinner and less of everything, (except peperoni) and still more than BA. Average slice to go is 4$ to 8$. The Hipster places can be ten bucks. for a slice.
Years ago, pre-covid, I used to gladly pay $40 or more for a one kilo steak at Proper, on Araoz, although we would split it 4 ways and get 6 starters too.
There have always been expensive restaurants in BA, only now, they are much more expensive.
I lament that Franca couldnt make it- it was excellent, and in the same price range you are talking about, but with a very interesting and unusual menu, and every single thing I tried there in my 3 or so visits was incredible.