It’s very much like your car.
Your car has fixed costs: pricetag, shipment, insurance, inspection, maintenance, cleaning. The opportunity cost of having an older model (vs a newer one).
Your car has variable costs: insurance (some policies are valid only over a certain range), repairs (parts break after miles not years), cleaning, and driving. Don‘t forget the opportunity costs as well (even when we’ll maintained and repaired, a car than run longer distance is worth much less).
The fixed cost you should indeed forget, those are sunken: the car is yours.
The variable costs is what should steer your decision if you want to drive.
Latest Answers