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Theoretically it would, because there are now fewer of them and the potential for them to circulate in future has been eliminated.
In practice, if someone died and their keys were lost, how would the market even know?
Think of it the other way round. If it was suddenly announced that there were going to be 42m bitcoins made, what would happen to the price?
frank9755
I guess it would have an impact relative to them being sold - but otherwise one person dying and their coins disappearing makes no actual difference right? Those coins wouldn't have been circulating to buy before and won't be after