

Why stocks aren't a casino, and why that changes everything.

A company is a machine that turns inputs into money. Some machines are better than others.

Margins, capital intensity, and why a dollar of revenue is worth more in some businesses.

From passive indexing to active stock picking. Where quality investing fits.

Network effects, switching costs, and the five types of competitive advantage.

Return on invested capital separates great companies from average ones.

The ability to raise prices without losing customers. The ultimate sign of a moat.

When multiple growth effects stack, returns don't add. They multiply.

Why buying "perfect" companies at high valuations is riskier than it seems.

Imperfect companies with hidden options can deliver extraordinary returns.

Improving margins creates more value than growing revenue. Here's the math.

Three real stories of optionality succeeding and failing.