Reminds me of travelling in Cambodia where USD is accepted everywhere and even comes out the ATM machines. You have to be careful checking all bills in change, because the slightest tear or even dirty/scrunched notes got refused by vendors, cafes, taxi, bars etc and you'd be stuck with them until you reached a normal money exchanger ... nothing but mint notes would work on the street and known scam was taking crisp notes from tourists with broken notes as change to take out the country ....