Set up by a former University of North Carolina (UNC) student, Morris Gelblum, the firm Sweeps uses UNC, Duke, North Carolina State, and other college students to perform a variety of short-term jobs, such as cleaning, yard work, painting, tech help, tutoring, and moving. A customer describes the work desired on the firm’s website, and the firm provides workers. For one job, they provide “21 guys dressed up like Frankenstein.” The firm’s motto is “College Students, On-Demand.” What input(s) does the firm use in the long run?