"From late 2008 to May 2014, the Fed’s balance sheet increased by a total of $3.4 trillion, well in excess of the $2.6 trillion increase in nominal GDP over the same period. This is hardly “Mission accomplished,” as QE supporters claim. Every dollar of QE generated only 76 cents of nominal GDP.
"Unlike the United States, which relied largely on its central bank’s efforts to cushion the crisis and foster recovery, China deployed a CN¥4 trillion fiscal stimulus (about 12% of its 2008 GDP) to jump-start its sagging economy in the depths of the crisis. Whereas the US fiscal stimulus of $787 billion (5.5% of its 2009 GDP) gained limited traction, at best, on the real economy, the Chinese effort produced an immediate and sharp increase in “shovel-ready” infrastructure projects that boosted the fixed-investment share of GDP from 44% in 2008 to 47% in 2009."
Clear explanation by Stephen Roach of why China's economic stimulus was so much more effective than that of the US