September's decision to leave rates unchanged was a close call.

'Solid performance' of labor market could still lead to rising interest rates in September.

Although financial markets have written off the idea of a U.S. interest rate increase in June, the Fed minutes from April suggest the possibility is still on the table.

Fed may reduce planned pace of interest rate increases, as other central banks around the world 'export their problems through currency weakness.'

The divergence among global central banks that was supposed to drive financial markets in 2016 barely lasted a month.

With interest rate liftoff in the past, Federal Reserve officials consider what to do about the huge volume of assets accumulated through quantitative easing.

Economists expect rate liftoff at Wednesday's Federal Reserve meeting, but question what the rate-rise path will look like thereafter.

Central bankers around the world are fighting to ensure that they continue to have the option to use tools like quantitative easing outside of financial crises.