Several studies have found mean reversion in monthly stock returns over long horizons. However, these studies can be challenged for several reasons, including the neglect or possible misspecification of risk premia. The current paper analyzes daily Dow returns over short horizons, which obviates...

Introduction -- 1. Investing 1.0 — Blind Faith and Speculation -- 2. Investing 2.0 — Intrinsic Value -- 3. Investing 3.0 — Measuring Risk -- 4. Investing 4.0 — Efficient Markets and Indexing -- 5. Investing 5.0 — Factor Models and Algorithms -- 6. Investing 6.0 — Real Value and Real...