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.
Joseph Stiglitz, former World Bank economist and others have estimated recently that the real cost of the Iraq and Afghanistan Wars at the end for the USA alone will be in the range $4 trillion to $6 trillion. To put matters into perspective the United Nations considers that $30 billion a year would end world hunger. Therefore for the average of $5 trillion, why not end world hunger for 167 years? But these Wars have cost the UK dearly also and some place the costs at the end to over Â£100 billion (or around $150 billion).