Tom and jacob are college students. both of them will probably get married later and have two or three children. each knows that if he studies more in​ college, he'll get a better job and earn more than if he​ doesn't study. earning more means the ability to spend more on their future familieslong dash—things like​ orthodontia, nice​ clothes, admission to an expensive​ college, and travel. tom thinks about the potential benefits to his potential children when he decides how much studying to do. jacob​ doesn't.