There is an ongoing debate about when (not whether) the Federal Reserve in the United States and the Bank of England will raise interest rates. Opponents of such a move acknowledge that interest rates have to go up some time but argue that the ongoing weakness in Europe, the slowdown in emerging market economies, and the turmoil in China are all good reasons to wait as long as possible. Proponents of an early rise worry about the distortions caused by prolonged ultra-low interest rates. They also want to bring interest rates up again so that they will have something to cut should they run into trouble in the future.
This debate may seem like the usual macroeconomic conversation you would expect to hear among central bankers and yet it is not. There is an underlying political controversy around central banking that creates an incentive for central bankers to move more quickly in raising interest rates than economic conditions might warrant. This controversy takes place any time central bankers approach the frontier between ‘conventional’ and ‘unconventional’ monetary policy; it gets stronger and more intense once they crossover and start using unconventional monetary policy instruments; and it lasts until central bankers find a way to return to normal.