Roberto, who was to become known as his brother's "accountant", said Pablo's Medellin drug cartel was making so much cash, it spent £1200 a month on rubber bands just to hold the wads of dollar bills together. In his new book, The Accountant's Story, published this week, Roberto reveals how Pablo came from poverty to become the seventh richest man in the world. The brothers were the sons of a teacher and a farmer and were so poor that once Pablo was sent home from school because he had no shoes. Roberto said: "Our poverty made an impression on our lives that neither my brother nor I ever forgot." Read more here.