The sell is 12, buy is higher, prob closer to 12.7, and if it is not favourable they may not buy.
Peso slaves are buying at around 10.5 at the minute, official + 20% retention (to be returned at end of yr if your accounts are straight...dont believe the hype, it's very achievable) Most people are using 10 as a reference point, buying at that rate, walking out the door to the street, selling and returning back to lodge 80% in their accounts and trouser the 20.
This is the gap "they" are trying to close, although they'll need to work hard to keep up with the liquidation of aguinaldos into dollars in dec and the holiday season frenzy.
Not sure if I would be confident enough to make any long term predictions as Argentina has a way of making fools of the brave.