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.
If you add these costs, and others, to the total tab, the cost of the war has jumped from $4.4 billion to $7.1 billion a month since the 2003 fiscal year, according to a paper co-authored in January by Columbia University professor and Nobel-prize winning economist Joseph Stiglitz, an outspoken critic of the war.