North Korea makes a near-perfect counterfeit bill, as the State Department admits:
Hard-to-detect fake US$100 notes made only by North Korea turned up in 2008 and 2009 in San Francisco and the South Korean city of Busan, although it was unclear how long the notes had been in circulation.
An influx of dollars will have little impact on the irrational economy of North Korea. But it could prove a annoyance for neighbouring countries, where the bills circulate widely, and where inflation is a risk.
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