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Stock prices are anchored to the expected discounted present value of firms' profits. Bitcoins have no anchor. Think of it this way: If the market went crazy and valued Apple at zero you would do very well to buy the entire company for $1000. But if the market decided to value Bitcoins at zero, you would not want to buy them all up for $1000.
Bitcoins are achored to the cost to produce them. Same as with e.g. gold. E.g. a gold-rush means that for some time gold is 'easy' to come by.