Interesting fact: the DPRK used to issue three parallel sets of coins and banknotes. One was for locals, one for visitors from other Socialist states, and one

Interesting fact: the DPRK used to issue three parallel sets of coins and banknotes. One was for locals, one for visitors from other Socialist states, and one for visitors from Western states. The three-tier model was a little but unusual, but the idea of a secondary currency for foreigners was not that uncommon. One other reason for it is to ensure "minimum spend" -- some countries required you to buy a certain amount of the foreigner currency at the official exchange rate as part of the entry process, even though the black-market rate for "local" currency was far more competitive.