Two weeks ago, North Korea’s largest denomination bill was worth 63 cents.

That bill is the 5,000 won note. When North Korea announced last last month that the bills would be replaced, even at a 1:1 exchange, its value fell to 52 cents, and many merchants refused to take the bills for any price.

As of last November, at the official exchange rate, a 5,000-won note was worth $52.