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The reason a PC devalues so much over a year is that the new model is much better. I would expect a bigger hard drive, more RAM and a faster processor on a new machine.
Could a reason for the better resale price be because the gap in performance between the year-old Mac and the new Mac is not as much as in the PC world? This could be due to a similar specified model being sold over a longer period of time in the more centralised Apple market,
Could someone compare the gains that have been made over a year for the two types of computer? And could we expect a rapid devaluation for the Mac when the less frequent but larger jump in technology is made?