Financial pundits often talk about the "50% rule" when deciding whether or not it's more cost effective to repair an item rather than replace it. The conventional wisdom was that if a repair was estimated to cost 50% or less than the amount you paid for an item, it was usually better to have it repaired. This is still a good guide to keep in mind, although many consumer products (e.g. electronics, furniture, appliances, even clothing) have continually dropped in price (in inflation adjusted dollars) in recent generations. So now, to be more accurate, the 50% rule should be based on replacement value, not original purchase price, or even on the estimated current market value or resale value of major items like automobiles. Regardless, it's simply one rule of thumb among many other considerations.