Sydney | What happens when two maladjusted billionaires tire of proving themselves by buying up the business world, wreaking havoc with their social networks, creating metaverses to rule over and building space rockets to colonise the universe? Well, they have a good old-fashioned fight of course.

In a development that is, at once the most ludicrous story you will read on The Australian Financial Review all year, and at the same time strangely unsurprising ... Facebook supremo Mark Zuckerberg and tech behemoth Elon Musk have called each other out for a cage fighting match-up, which Mr Musk wants to hold in Las Vegas.