Friendships are easy when you’re in high school. Most of the time, you make friends with someone only because you like each other. But when you get to college, you’ll probably find that maintaining (维持) friendships also requires money – you’ll have to spend money eating out with your classmates, dorm mates and co-workers in school associations so you don’t feel left out. And that causes a problem for some young people, as shown in the graphic below.