ZIMBABWE - APRIL 23:  The Zimbabwean Dollar, left, made up of various denominations held with a twenty South African Rand note, right, in Harare, Zimbabwe, on Thursday, April 23, 2009. The South African rand is the "reference" currency being used in Zimbabwe, and is the most popular in circulation together with the U.S. dollar, the Economic Planning Minister Elton Mangoma told reporters in Pretoria.  (Photo by Kate Holt/Bloomberg via Getty Images)