Hetty Green's $200M fortune (adjusted to $4.3B today) was built in the 1800s through real estate speculation, railroad bonds, and ruthless loan sharking during financial panics—she'd literally wait for companies to collapse, then swoop in with cash. Her wealth compounded in a pre-income-tax era where she paid virtually nothing to the government. But here's the cap on her empire: she had no scalable business model. She was a brilliant trader playing a finite game of buying distressed assets. Buffett, by contrast, built Berkshire Hathaway into a holding company that owns dozens of operating businesses—insurance, utilities, railroads, manufacturers. That's exponential wealth creation, not just asset arbitrage.

The real gap opener is time and compounding mechanics. Hetty made her fortune in a 40-year window (1860s-1900s) and then largely stopped. Buffett's been running Berkshire since 1965—58 years of continuous reinvestment at 20%+ annual returns. If you compound $4.3B at even 15% annually for that extra two decades, you're well into the $100B+ range. Plus, Buffett benefited from the post-WWII American economic expansion, the creation of the modern stock market, and decades of inflation that made his early investments absurdly valuable. Hetty was playing with a smaller total market pie.

Finally—and this is the psychological kicker—Hetty's extreme frugality actually limited her optionality. She wouldn't spend $500 on her son's medical care because she was trapped in scarcity mindset, even at $200M. Buffett's willingness to spend (on deals, on talent, on infrastructure) while maintaining discipline created better information and deal flow. He could outbid competitors, hire the best minds, and move fast. Her penny-pinching saved $500 and cost her son a leg *and* his future earning potential. His generosity pledge cost him nothing because the wealth kept compounding faster than he could give it away. Different eras, different engines, same lesson: hoarding doesn't scale.