A wealth tax on the very richest people in our society has never been more popular. Recent polling puts the plan at 90% approval, a figure almost unheard of for any policy proposal.

This week’s guest, Gabriel Zucman, is a French economist who has done the most comprehensive work on what such a tax could accomplish.

And he’s also a key inspiration for the UK’s leading wealth tax advocate – and friend of the show – Gary Stevenson.