Treasury Secretary Tim Geithner told CNBC Monday that he is certain that congressional leaders will strike a deal to raise the federal debt ceiling prior to the Aug. 2 deadline to avoid default. "Each side has said definitively that default is not an option," he said, "They're not going to play around with this." "If the United States of America were to default it would be catastrophic for the American economy, for the American financial system, for the average American people, it would be a substantial unfair tax on all Americans and it would bring the world economy ... to...