A village well can serve every household for fifty years and then sit almost untouched within five. Nothing was wrong with the well. The world around it simply found another way to get water — and that is exactly how a company’s strongest advantage can disappear while the company itself changes almost nothing at all.

Why the footnotes behind a company's profit number often matter more than the number itself, and three simple habits for reading them well.

Value Investing Basics There is a bakery two lanes from my house that makes one thing well: a plain butter biscuit, sold loose by weight. Two […]