Nobel Prize economist Joseph Stiglitz didn't believe reports on the cost of the war he was hearing and did a study.
This is from The Guardian   http://www.guardian.co.uk/world/2008/feb /28/iraq.afghanistan
 

Some time in 2005, Stiglitz and Linda Bilmes, who also served as an economic adviser under Clinton, noted that the official Congressional Budget Office estimate for the cost of the war so far was of the order of $500bn. The figure was so low, they didn't believe it, and decided to investigate. The paper they wrote together, and published in January 2006, revised the figure sharply upwards, to between $1 and $2 trillion. Even that, Stiglitz says now, was deliberately conservative: "We didn't want to sound outlandish."

So what did the Republicans say? "They had two reactions," Stiglitz says wearily. "One was Bush saying, 'We don't go to war on the calculations of green eye-shaded accountants or economists.' And our response was, 'No, you don't decide to fight a response to Pearl Harbour on the basis of that, but when there's a war of choice, you at least use it to make sure your timing is right, that you've done the preparation. And you really ought to do the calculations to see if there are alternative ways that are more effective at getting your objectives. The second criticism - which we admit - was that we only look at the costs, not the benefits. Now, we couldn't see any benefits. From our point of view we weren't sure what those were."

And this is from The Times (UK)
http://www.timesonline.co.uk/tol/comment /columnists/guest_contributors/article34 19840.ece

The Bush Administration was wrong about the benefits of the war and it was wrong about the costs of the war. The president and his advisers expected a quick, inexpensive conflict. Instead, we have a war that is costing more than anyone could have imagined.

The cost of direct US military operations - not even including long-term costs such as taking care of wounded veterans - already exceeds the cost of the 12-year war in Vietnam and is more than double the cost of the Korean War.

Nothing has yet been paid for, the costs are still going up, leaving will cost too and then there are the wounded and the costs of dealing with the radicalization that The Bush Horror has caused.

The Costs more after the break.

There's more...