The market. This is the trickiest consideration to gauge. it is not as simple as looking at the numbers. It is true, this will give you a pretty good idea of the market today, but when an editor buys a book he or she needs to be thinking about the market up to two years from now. After all, it is going to take the author six months to a year to finish his or her work. Once he or she delivers, it is going to be about a year before you can get the book in the schedule