Greg noted this John Cassidy piece in The New Yorker
Yet Wall Street’s role in financing new businesses is a small portion of what it does. The market for initial public offerings (I.P.O.s) of stock by U.S. companies never fully recovered from the tech bust. During the third quarter of 2010, just thirty-three U.S. companies went public, and they raised a paltry five billion dollars. Most people on Wall Street aren’t finding the next Apple or promoting a green rival to Exxon. They are buying and selling securities that are tied to existing firms and capital projects, or to something less concrete, such as the price of a stock or the level of an exchange rate. During the past two decades, trading volumes have risen exponentially across many markets: stocks, bonds, currencies, commodities, and all manner of derivative securities. In the first nine months of this year, sales and trading accounted for thirty-six per cent of Morgan Stanley’s revenues and a much higher proportion of profits. Traditional investment banking—the business of raising money for companies and advising them on deals—contributed less than fifteen per cent of the firm’s revenue. Goldman Sachs is even more reliant on trading. Between July and September of this year, trading accounted for sixty-three per cent of its revenue, and corporate finance just thirteen per cent.
In effect, many of the big banks have turned themselves from businesses whose profits rose and fell with the capital-raising needs of their clients into immense trading houses whose fortunes depend on their ability to exploit day-to-day movements in the markets. Because trading has become so central to their business, the big banks are forever trying to invent new financial products that they can sell but that their competitors, at least for the moment, cannot. Some recent innovations, such as tradable pollution rights and catastrophe bonds, have provided a public benefit. But it’s easy to point to other innovations that serve little purpose or that blew up and caused a lot of collateral damage, such as auction-rate securities and collateralized debt obligations. Testifying earlier this year before the Financial Crisis Inquiry Commission, Ben Bernanke, the chairman of the Federal Reserve, said that financial innovation “isn’t always a good thing,” adding that some innovations amplify risk and others are used primarily “to take unfair advantage rather than create a more efficient market.”