It's called the bathtub curve because it's shaped like a bathtub. It starts off high, drops suddenly, flattens out for a while then ramps back up again near the end of its life. In engineering, there's something called the "bathtub curve" that models when something is most likely to suffer a catastrophic failure. when an item is refurbished, that means it already experienced a break-down at one of the most likely failure points of its lifecycle. Why buy something that was already fixed once? Well, ACTUALLLLLLLLLLY. When recommending refurbs, I always run into hesitancy, which is understandable.
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