The St. Louis Fed President, James Bullard, argues in a paper, that the keeping of target interest rates near zero as promised by Ben Bernanke at the Federal Reserve, sets up a situation similiar to Japan of a "deflation trap." He said that core annual inflation of only 0.9% in May 2010 suggests that there is a risk that the nominal inerest rate and inflation end up being at an unintended steady state which is dangerously low. He also said that the market's interpretation of the Fed's extended period of low interests language had a perverse effect of stretching out the period before things normalize. He suggests as an appropriate step "quantitative easing"- a policy of buying monetary debt with longer dates. But for this to be effective, the action has to be credible.