Why is it wise idea to buy a car that has already depreciated a great deal ?

There are many reasons for this, such as it is cheaper to buy a used car that has already depreciated in value rather than buying a car brand new. Once you by a brand new car and drive it off the lot, the value of it decreases exponentially so in turn you lose more money than if you were to buy a used car. Think of it like this, a person in 2010 buys a brand new car for $30,000, fast forward it is now 2018 and someone else is buying that same car that is now used for maybe $10,000. The person who originally bought the car lost out on $20,000 because as time goes on, the brand new car's value has depreciated over the years to be very cheap. I hope this helps :)