When Swiss tycoons handed Donald Trump a gold bar and a Rolex watch – gifts that were followed by a cut in US tariffs – it was no diplomatic nicety. It was a reminder of how concentrated wealth seems to buy access and bend policy. It may, alarmingly, become the norm if the global “inequality emergency” continues. That’s the message of the most recent work by the Nobel laureate Joseph Stiglitz. The economist sees the yawning gap between rich and poor as a human-made crisis which is destroying politics, society and the planet. He’s not wrong.

The problem is no longer confined to a few fragile states. It is a global harm, with 90% of the world’s population living under the World Bank’s definition of “high income inequality”. The US sits just below that threshold and is the most unequal country in the G7, followed by the UK. Prof Stiglitz’s insight is that the current system’s defenders can no longer explain its mounting anomalies. Hence he wants a new framework to replace it. His blueprint for change is contained within the G20’s

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