for the big mac index, I went to macas recently and 7.86$US for a combo bigmac. I don't know about the price of the burger but it's not 100 pesos for a small chips and coke.
https://www.oroyfinanzas.com/2013/05/indice-big-mac-por-que-mas-baratos-big-macs-argentina/
Noesdeayer, I dunno, the...