Quit

About

Background summary — AI-generated; not source-grounded.

Quit: The Power of Knowing When to Walk Away is Annie Duke’s second book, a counter to the cultural worship of grit. Its argument: knowing when to quit is as much a skill as knowing when to persevere, and most people quit far too late rather than too early. The winners, Duke contends, quit a lot — they cut losing bets fast and redeploy attention to better ones.

The book diagnoses why quitting is so hard: sunk cost (we count what we have already spent), the endowment effect (we over-value what we own or have built), and identity (stopping feels like admitting failure, to ourselves and others). It argues that waste is prospective — if you would not start something today, every further unit you invest is the real waste — and prescribes tools to quit on time: kill criteria set in advance, ‘quitting coaches’ who hold you to them, and attention to the opportunity cost of continuing, which is invisible until you stop.

In the wiki

Annie Duke closes Annie Duke on Better Decisions, Kill Criteria, and When to Quit with the book’s thesis and its signature story: Stewart Butterfield shutting down the game Glitch — $6M in the bank, great press, 5,000 diehards — once back-of-envelope maths showed it was not a venture-scale business, and rolling the team’s internal chat tool into what became Slack. ‘He couldn’t see Slack until he quit Glitch.’ The book’s machinery is the basis for the wiki’s Kill Criteria page.