Humans always want more than they can get with the given resources and time. The constrain of resources forces us to make trade-offs. People in PAS also face trade-offs. Choosing between Ap course and normal course is a trade-off. Choosing an Ap course can get a better GPA, but it is harder to get an A. Choosing normal course is easier to get an A, but the GPA is lower. Office staff also face trade-offs. Whether to install vending machine. If school install a vending machine, it will allow students to buy drinks conveniently, but the trash in school might increase. If school does not install a vending machine, the trash will not be a lot, but the students can't conveniently buy drinks. I face trade-offs and scarcity myself, too. My demand of time is greater than supply. My trade-offs is that whether I should listen in class or sleep in. If I sleep in the class, I will not able to learn new material and I have to spend time in home to study, but I won't be very tired. If I participate in class, I will learn new materials, but I will be very tired. Everyone in School faces trade-offs from choosing classes, whether to install vending machine, and whether I should sleep in class. We always want more than our resources can provide.
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