Why would Royal Bank of Scotland Group plc inflict negative interest rates on its customers?

The fundamentals of banking are being turned on their head by the steady march lower of yields around the world, and with the Bank of England widely expected to cut Bank Rate towards zero, Royal Bank of Scotland (LSE: RBS) is warning things could get even more negative here, too.

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Owain Bennallack has no position in any shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.