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Ray Dalio

Ray Dalio (b. 1949): founder of Bridgewater, the world's largest hedge fund. The principles machine: mistakes turned into written rules, All Weather and diversification across uncorrelated streams as the 'holy grail'.

On this page

Principles (2017): "Pain plus reflection equals progress."
Period b. 1949
Founded Bridgewater Associates (1975, from his apartment)
Lens Systematic macro, portfolio construction
Key works Principles (2017); Big Debt Crises (2018)

Who he is

Portrait — Ray Dalio

Starting as a commodities broker and founding Bridgewater in a two-room apartment in 1975, Dalio built it into the largest hedge fund on the planet. The turning point came from a disaster: in 1982 he bet publicly on a depression that never came and nearly went under — he had to fire everyone and borrow from his father. From that mistake, his obsession: turning every lesson into a written, testable principle, until the firm itself became a decision-making machine.

Contribution

  • The "holy grail" of management — fifteen to twenty genuinely uncorrelated return streams cut risk without sacrificing return: diversification built on correlations, not on the number of positions.
  • All Weather / risk parity — the portfolio balanced by risk contribution and by economic scenario (growth/inflation up or down), not by invested capital: withstand every season instead of predicting the right one.
  • Mistakes → principles — every error produces a written rule; where possible, rules become algorithms: the institutional version of journaling and the trader's business plan.
  • The economic machine — his popular model of debt cycles (short and long): the macro context as an understandable mechanism, not background noise.

What today's students learn from him

  1. The right question about diversification is "how correlated are my risks?", not "how many positions do I have?" (see system correlation).
  2. A mistake becomes an asset only if it produces a written rule that prevents the repeat.
  3. Humility can be systematised: actively seeking whoever can prove you wrong costs less than finding out from the market.

Study path

In preparation — This entry will be extended with the economic machine and the portfolio principles. The basics: diversification and correlation.

  • trader
  • jim-simons — the other systematic pole: micro-signals vs macro-principles
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