Principles: Life and Work

Why it's worth it

Ray Dalio lays out the decision-making principles behind Bridgewater, split into life principles and work principles. It's the most intellectually ambitious book here and the least casual read — closer to a reference manual than a book you finish in a weekend.

This is the only book on the list you'll use as a reference rather than read once. The work principles section is essentially a catalog of hundreds of numbered rules covering hiring, disagreement, decision rights and firing. Readers commonly describe skimming the audiobook and then keeping the physical copy to flip back through, which is the right way to use it.

Dalio's central idea is an idea meritocracy: decisions should follow the best reasoning available, not the most senior person in the room. The mechanics he built around that — believability weighting, radical transparency, recording every meeting — are extreme by design. Even if you'd never implement them, working out why you disagree sharpens your own thinking about how your team makes decisions.

From our review of 10 leadership and business books, by David Sinclair, Managing Editor

What we like

• +This is the only book on the list you'll use as a reference rather than read once
• +Dalio's central idea is an idea meritocracy: decisions should follow the best reasoning available, not the most senior person in…
• +The opening third is autobiography, and it's the most readable part
• +This is the pick for someone who already leads at scale

What to know

• –It's genuinely long and structurally lopsided — a substantial book followed by an even more substantial list
• –The Bridgewater system is also famously hard to live inside