http://www.newyorker.com/talk/financial/2008/09/29/080929ta_
talk_surowiecki James Surowiecki: “All companies, of course, worry about how their stock is doing. But for most the stock price is a product of performance, rather than a cause of it. If Procter & Gamble’s stock plummeted tomorrow, people would still keep buying Tide. By contrast, if an investment bank’s share price tumbles, it not only wrecks people’s confidence but also can lead to credit-rating downgrades, which provoke a further decline in the stock price, and so on. The downward spiral can be stunningly fast and near-impossible to escape.” 22:15