 In fact, some writers make very profitable careers out of being the ninth or tenth writer to work on a piece, and they often work on projects that never see exposure to an audience of any size.Many up-and-coming screenwriters also ghostwrite projects and allow more-established screenwriters to take public credit for the project to increase the chances of it getting picked up.Hollywood has shifted writers onto and off projects since its earliest days, and the assignment of credits is not always straightforward or complete, which poses a problem for film study.