One economic reason is that music is pure information. In economics, information is a devil -- it's impossible to manage. For example, the whole of economic theory is the theory of scarce resources. If milk is freely available, then the price of milk is down; if milk is scarce, the price is up: this is economic theory. But it doesn't work for music; it doesn't work for information as a whole. If I have a pot of milk, and I give it to you, I don't have it anymore. But if I give you a piece of information I still have it, I keep it. Which means that if I have something and I give it to you, I create something new: abundance. And this means that economic theory doesn't work for information, when that information can be separated from its material support - a CD, or whatever is the case today.
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