A new interview show with host Steve Levitt. Today he speaks with the Harvard psychologist and linguist Steven Pinker. By cataloging the steady march of human progress, the self-declared “polite Canadian” has managed to enrage people on opposite ends of the political spectrum. Levitt tries to understand why.

The endless pursuit of G.D.P., argues the economist Kate Raworth, shortchanges too many people and also trashes the planet. Economic theory, she says, “needs to be rewritten” — and Raworth has tried, in a book called Doughnut Economics. It has found an audience among reformers, and now the city of Amsterdam is going whole doughnut.