Simplicity

In One Sentence

The investing methods that truly work are usually the simplest; the hard part has never been learning them, but following them for decades.

Why It Matters

Wall Street likes to make investing sound complicated, because complexity is easier to package and charge for. I spent more than ten years learning and making mistakes, and the method I ended up with fits in one sentence: save every month, buy the broad market through dollar-cost averaging, hold for the long run without selling at the highs, and add more from new income when markets crash. Your biggest opponent is yourself, always itching to try some new trick.

One Number

Keeping 10% to 20% of each month's money in cash and waiting for a 15% to 30% fall before investing it actually left you with 0.6% to 5.7% less wealth than investing everything every month, in the US from 1934 to 2026 (author's backtests · Chapter V).

In the Book

Chapter IV takes "The Great Way Is Simple" as its title (the phrase is often used to sum up the Tao Te Ching, though it doesn't actually appear in the original text). The Preface distills the whole book into a single sentence.

Go Further

• Dollar-cost averaging The simplest approach: invest a fixed amount every month, without guessing highs and lows.
• First principles Break things down to the basics, and the method naturally becomes simple.
• Patience and discipline For a simple method to work, you need the discipline to follow it year after year.
• The timing trap Guessing highs and lows turns something simple into something complicated, and it costs you over the long run.