Economist Joseph Stiglitz puts Iraq war cost at $3 trillion plus

Writing in these pages in early 2008, we put the total cost to the United States of the Iraq war at $3 trillion. This price tag dwarfed previous estimates, including the Bush administration's 2003 projections of a $50 billion to $60 billion war.

But today, as the United States ends combat in Iraq, it appears that our $3 trillion estimate (which accounted for both government expenses and the war's broader impact on the U.S. economy) was, if anything, too low. For example, the cost of diagnosing, treating and compensating disabled veterans has proved higher than we expected.

Moreover, two years on, it has become clear to us that our estimate did not capture what may have been the conflict's most sobering expenses: those in the category of "might have beens," or what economists call opportunity costs. For instance, many have wondered aloud whether, absent the Iraq invasion, we would still be stuck in Afghanistan. And this is not the only "what if" worth contemplating. We might also ask: If not for the war in Iraq, would oil prices have risen so rapidly? Would the federal debt be so high? Would the economic crisis have been so severe?

The answer to all four of these questions is probably no. The central lesson of economics is that resources -- including both money and attention -- are scarce. What was devoted to one theater, Iraq, was not available elsewhere.

The Iraq invasion diverted our attention from the Afghan war, now entering its 10th year. While "success" in Afghanistan might always have been elusive, we would probably have been able to assert more control over the Taliban, and suffered fewer casualties, if we had not been sidetracked. In 2003 -- the year we invaded Iraq -- the United States cut spending in Afghanistan to $14.7 billion (down from more than $20 billion in 2002), while we poured $53 billion into Iraq. In 2004, 2005 and 2006, we spent at least four times as much money in Iraq as in Afghanistan.

It is hard to believe that we would be embroiled in a bloody conflict in Afghanistan today if we had devoted the resources there that we instead deployed in Iraq. A troop surge in 2003 -- before the warlords and the Taliban reestablished control -- would have been much more effective than a surge in 2010.