Lawrence Summers said on Sunday that emails sent by Goldman Sachs executives making money by betting against risky mortgage securities highlight the need for transparency in financial markets. The release of the emails comes after the SEC charges that Goldman hid vital information from investors about a subprime mortgage-linked security. One email from Goldman Chief Executive Lloyd Blankfein dating from November 2007, said bluntly that the Goldman gambling machine "made more than we lost because of shorts." By shorts, he's not referring to underwear. Blankfein is talking about bets that your mortgage would explode and you'd lose your home. He was betting in favor of that. And his bet paid off big.