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.
At the 10 year anniversary of the start of the Iraq war, more than $40 billion a year are going to compensate veterans and survivors from the Spanish-American War from 1898, World War I and II, the Korean War, the Vietnam War, the two Iraq campaigns and the Afghanistan conflict. And those costs are rising rapidly.