NPR's David Molpus reports on the job of figuring the financial cost of a U.S. strike on Iraq. Estimates run from a billion a week — even without any fighting — to $25 billion a year for a post-war occupation of Iraq. The Congressional Budget Office's estimate ranges from $40 billion to $200 billion. Some say the U.S. needs the war to lower oil prices and revive the stock market. Others say the consideration should be how effective a strike would be on the war on terrorism.