The Department of the Treasury is reporting one to one exchange for the Zim. If all currencies go to a gold backed unit. Then there will be no exchange rate. They only reason there would be for an exchange rate other than 1:1, would be if one was gold backed and the other was not. For example, if the USTN is gold back and the Zim is gold backed then the single unit of 1 dollar would equate to one ounce silver.