When Ben Bernanke addresses the annual symposium of central bankers in Jackson Hole tomorrow he does so against arguably the most challenging backdrop in his tenure as Federal Reserve chairman.

At the end of a week of gloomy reports, Bernanke faces mounting expectations from markets that the Fed will step in to prop up the US's faltering economic recovery. News of stalling business activity and dismal home sales have fanned talk of a double-dip recession at a time when all the easy options have run out. At the same time, divisions appear to be emerging among his committee of policymakers. READ MORE