When the price of a stock can be influenced by a "herd" on Wall Street with prices set at the margin by the most emotional person, or the greediest person, or the most depressed person, it is hard to argue that the market always prices rationally. In fact, market prices are often nonsensical.
Warren BuffettRelated topics
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In market research I did at Microsoft Corp. in the early 1990s, I estimated that the 'Wall Street Journal' took in about 75 cents per copy from subscribers, $1.25 at the newsstand and a whopping $5 per copy from ads. The ad revenue let them run a far bigger newsroom than subscribers were paying for.
Nathan Myhrvold