The other issue that comes up with credit card use, is that outside of restaurants, some merchants may expect the buyer to pay a surcharge if they want to use a credit card. Unlike the US, this is a legal and standard business practice in Argentina.

It is also not uncommon to see some restaurants and higher-end stores post the rate of exchange they will give if you can pay in US$. Often that will be very close to the interbank rate, and for a year or two after the peso devaluation, it was sometimes a better rate.

John