[kahljorn]

Prices on things don't mean anything, despite... Okay, I actually have no idea where that idea came from.

Most supply is noted when people buy things, this is true, but it isn't them that buys it that makes the noted supply so noted. Moreover, it's the fact that one day there is a loaf of bread, and the next there isn't. All that is required is a book keeper that knows that 10-7 leaves you with three, so instead of ordering 10 you should only order 7. Price plays no part.
Price only indicates profit and loss, in a socialist enviroment "Profit" is not regarded as a necessary component. Though the confusing aspect would be in regards to how 'trade' would function, it would be like two seperate economies. An international economy and a national.

We could all learn from star trek!