re: Argentine Peso

After the fact, I realized I was lucky nothing happened to me as I exchanged money on the blue market. The outdoor mall was deserted due to the hour. Not so smart. Then, I felt like a bad arse because normally I'd never do something like that.

US Dollars are definitely preferred by those in the tourist business. Credit cards are preferred over pesos, too, and some businesses will give a discount if you pay with one.