Opportunity cost: Gasoline, insurance, depreciation, and repairs are all costs of owning a car. Which of these can be considered opportunity costs in the context of each of the following decisions?

a.You own a car and are deciding whether to drive 100 miles for a weekend visit to a friend at another university.

b.You do not own a car but are considering buying one so that you can get a part-time job located five miles from where you live.

In general, why does the context in which you decide to do something affect the opportunity cost of doing it?