The author is a Reuters Breakingviews columnist. The opinions expressed are his own.
Sweden's Riksbank left its negative interest rate steady at -0.35 percent on Wednesday and increased its bond purchase programme by another 65 billion crowns (just under 7 billion euros). It also said it could cut rates again if needed.
Currency concerns in the central banking world have come to the fore again.
Sweden cut interest rates further into negative territory out of the blue last week, fearing its strong currency will engender deflation. The Swiss National Bank said it would aim to weaken what it sees as a "significantly overvalued" franc. And the Bank of England flagged the risk that sterling could strengthen further and leave inflation below target for longer.