Paperback editions of any book are meant to be more expensive than kindle editions because paperback editions cost a lot when it comes to cost of paper, cost of printing, advertising, and delivery and uploading it on the internet for the kindle edition. However, in this case the kindle edition of the book the Kite Runner more expensive than the paperback edition.
When it comes to selling an item in the market two things have to be considered; demand and supply. If the demand for a good is elastic then price of the good becomes constant but if it is inelastic then the price will keep fluctuating. Most markets work with price elasticity, when demand for a good is high the suppliers tend to increase prices to maximize their profits but if the demand for a commodity is low the suppliers tend to lower their prices so that demand can increase.
In this case the kindle edition of the Kite Runner is special so its demand curve is inelastic making it to be priced higher by the suppliers and the demand still remains the same. Demand would easily be affected in such a scenario if the product has other substitutes but in this case demand is not affected due to the lack of competition in the eBook.
Consumers of this book could be getting better benefits when purchasing the kindle edition than when purchasing the paperback edition. When the book is in paperback it is under a lot of risks, it could be stolen, lost, torn, destroyed by liquids, insects or pets. However, when in kindle edition it is safe from all this risks and is easily accessible. This makes the consumers comfortable with paying more for the book.
References
Frank, H.R & Bernanke, S. B (2011) Principles of Microeconomics
