Can You a Fathom a Trillion?

From an article by Martin Wolk on MSNBC:

...most estimates [of the cost of the Iraq war] put forward by White House officials in 2002 and 2003 were relatively low compared with the nation's gross domestic product, the size of the federal budget or the cost of past wars. White House economic adviser Lawrence Lindsey was the exception to the rule, offering an "upper bound" estimate of $100 billion to $200 billion in a September 2002 interview with The Wall Street Journal. That figure raised eyebrows at the time, although Lindsey argued the cost was small, adding, "The successful prosecution of the war would be good for the economy." U.S. direct spending on the war in Iraq already has surpassed the upper bound of Lindsey's upper bound, and most economists attribute billions more in indirect costs to the war effort. Even if the U.S. exits Iraq within another three years, total direct and indirect costs to U.S. taxpayers will likely by more than $400 billion, and one estimate puts the total economic impact at up to $2 trillion.