Investing in Paper Bills

Collecting coins may be a fun and profitable career or business but don't forget paper bills. Although there are lesser collectors of paper bills, the fact remains that both coin and paper bill collecting and reselling go hand in hand together because they're inseparable twins. Collectible paper bills can also fetch expensive prices, so always check the paper bill in your pocket even circulated ones for there might just be a buyer locally or overseas who would be willing to buy it for much more than its face value.
This book is for those interested in making more money than what their paper bill is actually worth. It's like making more money on top of money you already have...