To taper or not to taper? That is the question facing central bankers as they debate when they should unwind the massive economic support measures they deployed last year to prevent a pandemic-induced Great Depression. "The withdrawal of monetary and fiscal support is inevitable. The key question is timing," said Eva Sun-Wai, fund manager at M&G Investments. As the US Federal Reserve and other central banks hold meetings this week, here are key questions regarding their monetary policies