The key ideas

Principles: Life and Work

Ray Dalio, 2017

In 1982, Ray Dalio was certain of his forecast, got it wrong, and ended up alone in his own firm. That failure gave rise to a system of rules later used at one of the world’s largest hedge funds. We examine why a mistake became a turning point, whose opinion should carry more weight, and the cost of a culture of “radical truth.”

Who it is for

For anyone making decisions at work and in life, managing people, or wanting to take their own mistakes more calmly.

You can have almost anything you want, but not everything at once. Maturity is knowing how to give up something good for something better.

What the book is about

In 1982, Ray Dalio, founder of the small investment firm Bridgewater, was certain the economy faced a severe crisis. He said so publicly, including at congressional hearings. He was wrong. The firm lost almost everything, and Dalio recalls borrowing $4,000 from his father to pay the family bills.

Years later, Bridgewater grew into one of the world’s largest hedge funds. Dalio described his journey in Principles: Life and Work. It developed from internal notes for employees that he posted online in 2011.

An important point first: this is one investor’s personal system of rules and one company’s culture rather than scientific research. Ahead are his central formula, five steps toward a goal, a debate about whose opinion should carry more weight, and an open question: does this system suit other people?

Idea 1. Certainty that cost everything

Dalio predicted a debt crisis. In the summer of 1982, Mexico did indeed default. He confidently said the economy would not have a soft landing.

Instead, contrary to his expectations, the market rose and began a long climb. Dalio had got the main point wrong. He lost his own and his clients’ money, dismissing employees one by one until only one person remained at Bridgewater: himself.

Dalio writes that this failure changed his approach. Instead of asking “How can I prove I’m right?” he began asking “How do I know I’m right?” He started seeking intelligent people who disagreed with him so he could understand their reasoning.

Someone confidently tells friends which apartment will certainly rise in value and puts all their savings into it without once asking people who think otherwise.

In Dalio’s story, the danger lay in both the mistaken forecast and the certainty that prevented him from considering he might be wrong. “How do I know I’m right?” may offer more than another argument in your favor.

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About the author

Ray Dalio is an American investor. In 1975, he founded Bridgewater Associates, which grew into one of the world’s largest hedge funds. He has written several books about economics and decision-making.

All books by this author: Ray Dalio

Terms from the book

  • Radical open-mindedness: Dalio’s term for being genuinely willing to consider that you may be wrong and taking more interest in someone else’s reasoning than in defending your own. The author’s concept rather than a scientific category.
  • 5-Step Process: Dalio’s method for moving toward a goal: goal, problems, diagnosis of causes, solution, execution. The author’s framework rather than a tested scientific model.
  • Radical truth: A principle of Bridgewater’s culture: say what you think, including to your manager, and do not discuss people behind their backs. A rule from one company.
  • Radical transparency: A Bridgewater principle: almost all information, including meeting recordings, is accessible to employees. One company’s practice, which does not suit everyone.
  • Believability: For Dalio, a measure of how much weight to give someone’s opinion: how many times they have successfully done what they are discussing and whether they can explain their conclusions. An internal rating system rather than a scientific metric.
  • Idea meritocracy: Dalio’s model: the best idea should win an argument rather than the highest rank. It combines radical truth, transparency, and consideration of believability. Views differ on how it operates at Bridgewater itself.

All terms

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