If the exchanges are empty then there is a huge supply that can go back on them
The exchanges are part of the market. If the market doesn't have the supply, but a bunch of people are wanting it (demand). The price goes up. There needs to be more supply on the market, with less demand to go down. It's possible to drop if demand dries up, even if the supply is low or high. But that's usually with physical items that age out of use or failed projects or companies. It really depends on what it is. Like computer ram that's 10 years old, there is still a small demand, but the supply is also low and no more are being made, so it can be more expensive than new ram.
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The price of the Ram won't drop until say someone discovers a large cache of the old ram sitting in a warehouse... But the price won't be affected until the market sees that ram is actually on the market. If the person keeps it secret and never sells it, it won't affect the market.
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