Focus on the concept of your screenplay. To write a screenplay that sells, you need to have a plot idea for a movie that is truly original. If you want to be able to sell your screenplay, you need to make sure that you have a concept that will capture the interest of the studio executive who is considering buying your screenplay.
Give your screenplay an exciting twist. Writing a screenplay that sells means writing a screenplay that captures the attention of a reader and keeps it. For that to be possible, you need to write a screenplay that keeps readers on the edge of their seats.
Make your dialogue snappy. Snappy, well-written dialogue will help you to sell your screenplay. If a studio exec is still thinking about a great line or a memorable character a few days later, they will be much more likely to want to buy your screenplay and make it into a movie.
Make your screenplay commercial. When you are writing a screenplay that sells, you need to make sure that your screenplay will appeal to as wide an audience as possible. While books can appeal to only a few people, movies must be seen by countless millions of people in order to be considered successful. Your screenplay needs to appeal to millions of people. Keep that in mind.