The former World Bank vice-president yesterday said the war had, so far, cost the US something like $US3trillion ($3.3 trillion) compared with the $US50-$US60-billion predicted in 2003.

Australia also faced a real bill much greater than the $2.2billion in military spending reported last week by Australian Defence Force chief Angus Houston, Professor Stiglitz said, pointing to higher oil prices and other indirect costs of the wars.

Professor Stiglitz told the Chatham House think tank in London that the Bush White House was currently estimating the cost of the war at about $US500 billion, but that figure massively understated things such as the medical and welfare costs of US military servicemen.