Calm down. I have really bad teeth too, when my teeth where developing I got a fever and now they are weak. I have to get braces and I am scared too but trust him. Think about how afterwards you will have nice straight teeth. I am so sorry you are horrified. Wish you the best of luck!
It deals with opportunity costs. Opportunity costs are not real costs, but rather the things that you had to give up in order to obtain something else. What you didn't obtain is considered to be an opportunity cost. A production possibility curve deals with this.
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