We need a four-day workweek

For the planet, our health and our happiness — it’s time to ditch the 40-hour week

In 1930, the great economist John Maynard Keynes made a bold prediction. He envisioned that by the time the 21st century rolled around, we’d all be working 15-hour weeks. Keynes argued that technological advances would eliminate most of the menial tasks, freeing humanity to…