Because just one out of every ten scripts is produced, selling a screenplay is more difficult than selling a novel. While the main distinctions between a novel and a screenplay are the amount of pages and the quantity of written words, the reader evaluates the plot equally. In fact, it's even possible to write a bad screenplay; there are some films that have been criticized for being too confusing or having an unclear message. The average cost of selling a screenplay is about $15,000. This includes a literary agent's commission of 20% of the sale price plus other fees such as casting directors and attorneys who may be paid upon acceptance of the script. After the sales agent receives a draft, he or she will try to get producers interested by submitting it to various companies. If no company expresses interest after several weeks, then another sales agent will be hired to sell the script elsewhere. Finally, if no company is willing to buy the script, then the writer has failed. Often, writers think that because books are published and movies are made from books, selling a book is easier than selling a movie. But this is not always the case. Although books can make good investments because they tend to be popular products that many people want to buy, this isn't always true for movies.