Schroeder traces Warren Buffett's earliest years, showing how his fascination with numbers, business, and — crucially — the power of compounding emerged remarkably early, well before any formal investing career began, framing his later success as the product of decades of consistent habit rather than sudden insight.

Key formative elements Schroeder documents:

• As a child, Buffett was already running small businesses (selling gum, delivering newspapers, running pinball machines) and obsessively tracking numbers and odds
• He encountered the concept of compound interest early and became genuinely fascinated by its long-term power, an idea that would define his entire investment philosophy — the "snowball" of the book's title
• His relationship with his father, a stockbroker and congressman, exposed him early to both the mechanics of markets and a strong personal ethical framework that shaped his later reputation

This early material establishes that Buffett's investing philosophy wasn't a later-life discovery but a consistent, decades-long extension of instincts formed in childhood.