Janet Yellen’s Federal Reserve is “reasonably confident” it can drive up consumer prices. Mario Draghi says his European Central Bank’s stimulus has already “proven so far to be potent.” The Bank of England reckons inflation is “likely to return” to its target within two years.

While not quite declarations of victory, such statements show policymakers’ optimism that record-low interest rates and bond buying will be enough to return inflation to the 2 percent range most of them eye.