In a sense this is true, and although I don't have a lot of knowledge of economics, I think the answer is simple: there is a reasonable expectation that people have for certain items/spells, and if they don't get that price they simply keep the item in bank until they do.
Secondly, the supply/demand thing seems to work only if there is a seller who is always wanting to sell stuff because of a duty to make money for shareholders or for him/herself. Here there is no real need to constantly be making money like there is in real life.
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