15 pages, wow. Make your punctuation narks larger than the font. When you are talking about a certain topic, take a long time to explain it. Instead of doing a short paragraph, do like 3 paragraphs on that topic. Talk about why money started to change. when money changed. how they changed the money. where miney is produced. different type of things they used in the barter system and ehy they used them. how money impact us today etc