Federal Reserve chairman Ben Bernanke has laid out four "unconventional" policy options to boost the US economy.
Top of the list is more "quantitative easing" - mass purchases of debt.
Speaking to fellow central bankers at the annual Jackson Hole symposium in Wyoming he said the recovery had slowed to "a pace somewhat weaker" than forecast.
Hours earlier economic growth for April to June was revised to an annualised rate of 1.6%, down from 2.4%.
http://www.bbc.co.uk/news/business-11114315
Note: 27 August 2010 Last updated at 16:21 GMT