As such, comparative advantage is an important concept in global trade, and it's the reason many countries concentrate on trying to produce certain goods or services more efficiently than other countries.
In March 2013, the total cost of the Iraq War to date was estimated at $1.7 trillion by the Watson Institute of International Studies at Brown University. Some argue that the total cost of the war to the U.S. economy will range from $3 trillion to $6 trillion, including interest rates, by 2053, as described in the Watson Institute's report.
Although estimates of Hurricane Katrina's staggering toll on the treasury are highly imprecise, costs are certain to climb to $200 billion in the coming weeks. The final accounting could approach the more than $300 billion spent in four years to fight in Afghanistan and Iraq.