Levels of inequality, particularly in the West, have been growing steadily over the last 50 years, and they seem likely to accelerate in the wake of Covid–19. Why is this? Why was the 20th century so good as equalising wealth and income, why is the 21st century different, and what should we do about it?

Nick Spencer talks to the economist, Thomas Piketty – whose books Capital in the 21st century and Capital and Ideology have changed the debate on the subject – about inequality, solidarity, and the dangers of treating property as if it were sacred.