It's the flipside of the oft proposed "let them vote with their dollars" solution that's not often discussed: in order to make informed decisions people need (easy, plain language) access to honest, total information. If the problem of information is solved today in a non-utopian free-market, the move to one becomes less dangerous. If we shift to one from the information desert of today the consumer is just screwed for eternity.
That is, it's one problem of many with that solution; the hardest, as I see it, is proving that such a thing as a rational, informed consumer is not a myth.