http://www.guardian.co.uk/business/2009/apr/15/us-economy-deflation-recession
The US economy has begun to deflate for the first time in more than half a century as a slump in demand pushes energy and food costs lower.
(...)
"With the unemployment rate and the output gap both headed for 10% and the financial system still crippled, the risk of a pernicious debt-deflation emerging [where the collateral on loans decreases damagingly in value] is still much bigger than the risk that the Fed's quantitative easing actions will lead to runaway inflation," said Paul Ashworth, senior US economist at Capital Economics.