COMMENT:

US president Donald Trump is tweeting more often these days.

The bad news is that, despite the mental health benefits of switching off the social media platform, if you manage money for a living, you cannot afford to ignore him.

Strategists at JPMorgan Chase have crunched the numbers. The result — and we have to applaud the Atacama Desert-levels of dry wit on display here — is the "Volfefe Index".

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Named after the president's baffling "covfefe" tweet of 2017, the index (pronounced vol-fey-fey) seeks to determine how much @realDonaldTrump shakes up the bond markets. The short answer: quite a

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