If you have a car and you continue to fix it every time a problem occurs, why can’t you keep the car and drive it forever as-long as you have to money to fix it if something goes wrong?
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Two reasons
Economical: there can be hurdles to keep fixing a car. As it ages and wears, the failures of parts and repair needed can become expensive. Parts get discontinued by the mfr. aftermarket companies can’t justify reproducing all but the most common service parts for cars. Or a particular repair, while possible, could be so labor intensive that the cost to fix the car is just so much greater than the utility value of car itself. Technically the car could be fixed but nobody is willing to put the time and money in required to do it, compared to the other options, I.e junk the car and buy another one.
Environmental: cars are generally made of materials that corrode in humid environments: steel, iron, aluminum alloys. If they are used in places where roads are salted in the winter the process is accelerated. No car is immune to corrosion, it can only be slowed down by paint, rust protection coatings etc. eventuality the structure of the car will become compromised and unsafe. This is a big limitation of vehicle life in some locations, while some ideal climates (dry with no winter snow!) corrosion is hardly a concern at all.
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