I put 80% of my money in the S&P after a billionaire investor told me not to

11 May 2026 · 64 min
1:03:55

In this hour‑long conversation Sam Parr and Shaan Puri explore why much of our investing and saving habits may be hard‑wired, drawing on a 2014 Swedish twin study that found roughly 45% of financial‑related behaviors are genetic. They break down the six biases the study identified (few stocks, excess turnover, performance chasing, home‑bias, lottery‑type stocks, and the disposition effect) and discuss how these biases can reflect deeper personality traits. The hosts then shift to personal finance, explaining why Sam allocated 80% of his net worth to the S&P 500 despite contrary advice from a billionaire investor, and how a long‑term 8% annual return target guides his decisions. Throughout, they stress the importance of self‑knowledge: matching work and investment style to one’s “zone of genius,” using pre‑commitment, shortening feedback loops, and avoiding games that clash with innate tendencies. The dialogue expands to broader tech trends – AI as the “company brain,” the ethical and economic implications of AI‑driven productivity, AI‑guided personal health nudges, and the shifting opportunity landscape from social media to crypto to AI. They also touch on reputation‑laundering in corporate history, the need for aesthetically pleasing data centers to win public acceptance, and emerging defense challenges such as low‑cost drone swarms. The conversation is peppered with anecdotes about investors (Mohnish Pabrai, Warren Buffett, Howard Marks), historical figures (Rockefeller, Carnegie), and modern innovators (Daniel Gross, Nat Friedman), illustrating how personal traits, behavioral finance, and macro‑technology trends intersect.

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