Think of removing three zeros as literally ‘removing the old currency from circulation.’ That’s all it means. How they do it is entice you and me and Iraqi citizens with an attractive amount. After a certain amount of all that old currency is removed, CBI will up the exchange rate in increments until it hits the rate they want. This is called a dirty float. Most likely after awhile, the CBI will change this to a pure float which is like what you see on regular ForEx, like the dollar does, the Euro does, the pound does, etc. But that won’t matter to you and me because we will have already gotten rid of our dinars and exchanged them for dollars (or whatever currency your own country uses.)