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They have value as much as people believe they can find a buyer for them (in present time or in future).

Take it to the extreme and think about gold. Why has gold intrinsic value? Because people believe that others would want to have it. The price is given by how big the wish is get more metal versus the wish get rid of it. You may not trade a dime (like in some communist countries that made gold illegal), and it still keep its value (even earned value on the markets where it was not tradeble). Because the believe is that there will be buyers for it.

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