People Make Tradeoffs
Economic goods and services are limited, while the need to use services of these goods and services seem limitless. There are simply not enough goods and services to satisfy even a small fraction of everyone's consumption desires. Thus, societies must decide how to use these limited resources and distribute them among different people. This means, to get one thing that we like, we usually have to give up another thing that we also like. Making decision requires trading off one goal against another.