AP Photo

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