Opportunity cost measures the items forgone as a result of making a choice. It is NOT measured in dollars,
but as a quantity of the good forgone. The good forgone is on the top of the fraction.
In the economy below, you can only produce iPods and cars.
If all resources are devoted to ipods, or to cars, how many would be produced, and therefore what is the
opportunity cost of 1 car, and 1 ipod?