Wealth and income are not the same thing

The book's foundational distinction is between people who are rich — high income, high visible spending — and people who are wealthy — high net worth, often invisible spending. A surgeon earning half a million a year who spends nearly all of it on a mansion, luxury cars, and private schooling can have less net worth than a hardware-store owner earning a fraction of that who saves and invests consistently.

Stanley and Danko's surveys found many high-income professionals living paycheck to paycheck in relative terms — what they call UAWs, Under Accumulators of Wealth — while people with far more modest incomes had quietly built seven-figure net worths as PAWs, Prodigious Accumulators of Wealth.

The authors argue that income is simply the opportunity to build wealth; what you do with it is the actual mechanism. Takeaway: track net worth, not income, as the real scoreboard.