When giants like Paul Krugman and Niall Ferguson start to argue, they both sound compelling. Ferguson says that interest rates are rising because of the deficit, and Krugman retorts that Ferguson has forgotten his first-year economics. Fortunately, the data can speak, and it's time to give them a voice. This is why I turn to my frequent collaborator, Eric Zitzewitz, who has an incredibly handy knack for getting financial data to speak clearly. Eric's verdict? You'll have to keep reading.