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Investment Blogs

Learn the market, one lesson a day

A free and open library of short, timeless lessons on stocks and investing — fundamentals, technicals, indicators, risk and market psychology. Every post teaches one concrete idea with a worked example. No signup, no paywall.

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Case Studies & Mental Models4 min

Why Your Best Trade Might Be Your Worst Teacher

Learn why the stock market sometimes rewards bad habits, and how to protect your portfolio from the trap of outcome bias.

22 Sept 2026#behavioral finance#mental models#investing psychology
Case Studies & Mental Models4 min

The Sentiment Pendulum: Why Stock Prices Rarely Stay Fair

Learn how Howard Marks' pendulum model helps you spot when a stock is priced for perfection versus priced for extinction.

21 Sept 2026#mental models#valuation#market psychology
Case Studies & Mental Models4 min

The Two-Sentence Test: Finding Your Circle of Competence

Learn how to protect your portfolio by investing only in businesses whose profit engines you can explain on the back of a napkin.

20 Sept 2026#mental models#investing basics#risk management
Case Studies & Mental Models4 min

The Inverted PE Trap: Why 'Cheap' Cyclical Stocks Can Ruin You

Learn why commodity stocks look cheapest right before they crash, and how to use the inverted PE mental model to protect your capital.

17 Sept 2026#mental models#valuation#cyclical stocks
Case Studies & Mental Models4 min

The Turnaround Arc: Why the Market is Late to Believe

Discover the predictable three-step phase of a real business turnaround and why patience is your best defense against value traps.

16 Sept 2026#mental models#turnarounds#value investing
Case Studies & Mental Models4 min

The 'And Then What?' Test: Master Second-Order Thinking

Learn why buying great news can lead to poor returns, and how to look past the consensus to find true stock market value.

29 Aug 2026#mental models#investing psychology#valuation
Case Studies & Mental Models4 min

The Graveyard Bias: Why 'Buy and Hold' Backtests Lie

Learn how index churn and forgotten companies create a false illusion of guaranteed stock market wealth.

29 Aug 2026#mental models#investing basics#survivorship bias
Case Studies & Mental Models4 min

How to Spot a Value Trap Before It Snaps

Learn how to distinguish a temporarily cheap cyclical stock from a permanently dying business.

29 Aug 2026#value investing#fundamental analysis#mental models
Case Studies & Mental Models4 min

The Anatomy of Every Bubble Ever

Learn the classic Minsky phases of a market bubble and how to calculate if a stock's price is driven by real earnings or pure hype.

29 Aug 2026#mental models#market history#valuation