I don't understand why they need a financial system at all. It seems to be too expensive for them to maintain.
While bringing in the U.S. dollar in 2009 helped end an almost decade-long recession and restored financial transactions in what was rapidly becoming a barter economy, it left consumers and retailers scrambling for coins. Shops took to providing change in candy, pens and hastily scribbled “credit notes” for anything from one to 99 cents.