Cash Banned in North Korea
From the above link…
“There were reports of public outrage and confusion after the announcement of the measure, which requires North Koreans to swap existing won notes for new ones at an exchange rate of one to 100 — effectively knocking two zeroes off their value. Because of a cap of 100,000 won per family (£475 at the official exchange rate), anyone with significant holdings of cash will have their savings wiped out.”