There's arguably no economic decision-maker more powerful than the Federal Reserve, America's central bank, and no one more powerful in the Fed than its chairman. The decision to flood the economy with cash or hike up interest rates can make or break nations. And the man who's steered America through its worst recession in decades, Ben Bernanke, is on the way out. His term expires in January.

That leaves the job of leading America’s monetary policy up for grabs. Any week now, US President Barack Obama will announce who he wants to replace Bernanke. So who's in the mix?