http://coppolacomment.blogspot.com.au/2013/05/inflation-deflation-and-qe.html
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Under-employment and falling productivity force down real incomes. Add to this the effects of fiscal tightening in both the UK and the US, which hit working people on middle to low incomes disproportionately, and to my mind you have a significant hit to aggregate demand which is sufficient to explain deflation in both countries. Both UK and US governments believe that monetary tools such as QE can offset the contractionary impact of fiscal tightening. But this is wrong.