granting that there was a gateway in argentina accepting argentine pesos?  i couldn't see why not.

you see, that is why we are spreading the word about ripple everywhere so we make more and more people aware of it and use it and build stuff above and around it whether you are a trader, a banker, developer, coder, merchant etc..

right now, what ripple needs is gateways, lots of them to make it easier for people around the globe to transfer money into the ripple network.  so far we have a few.  you can read more about ripple gateways here:  https://xrptalk.org/topic/1770-guide-to-ripple-gateways-how-to-move-money-in-and-out-of-the-ripple-network/  and here:  https://ripple.com/ripple-gateways.pdf

so far the most liquid currencies in the network are btc, usd and cny.

for a complete newbie guide, like how to send money in ripple, there are video tutorials here:  https://xrptalk.org/topic/2204-video-tutorials-for-beginners/

enjoy.