You wouldn’t think you could win a Nobel Prize for showing that humans tend to make irrational decisions. But that’s what Richard Thaler has done. The founder of behavioral economics describes his unlikely route to success; his reputation for being lazy; and his efforts to fix the world — one nudge at a time.

What do Renaissance painting, civil-rights movements, and Olympic cycling have in common? In each case, huge breakthroughs came from taking tiny steps. In a world where everyone is looking for the next moonshot, we shouldn’t ignore the power of incrementalism.