Sit-on-Your-Ass Investing

Definition

"Sit on your ass investing" is Munger's term for buying a business with exceptional long-term economics and then doing nothing — no trading around it, no reacting to price swings — for years or decades. The payoff isn't just avoiding brokerage fees and "less nonsense"; it's that a single, long-deferred capital-gains tax bill is worth one to three extra percentage points of annual return compared to constant buying and selling, each round of which triggers its own tax.

In the Book

The book runs the arithmetic directly: a million-dollar investment compounding at 4% for twenty years grows to about $2.19 million; add the 3 points that come from deferring tax through a single long hold, and the same twenty years compounding at 7% ends near $3.87 million — nearly double, purely from not trading. The book contrasts this with Benjamin Graham's method (covered under margin of safety), which required selling once a stock hit calculated intrinsic value — a discipline that would have forced Munger and Buffett out of Berkshire Hathaway itself decades before it reached $210,000 a share. Chapter 8 closes on the asymmetry this creates: time is "a good friend" to a business with excellent economics, and "a curse" to a mediocre one — so the same inaction that compounds a wonderful business will quietly destroy capital in a bad one.

Why It Matters

This concept separates two things people conflate: activity and value creation. It gives a concrete, quantified reason (not just a temperament preference) for preferring long holding periods whenever the underlying asset's economics are actually improving over time — and it names the condition under which the identical behavior (doing nothing) becomes reckless instead of wise: when the thing being held isn't compounding at all.