Investment Decisions Built as Systems
Personal investing reviews, risk frameworks and compounding models. These articles document decisions and mistakes; they are not investment advice.
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Compounding & FIRE assumptions
Model principal, contributions, return assumptions, time and inflation first.
AI financial analysis
Structure public company research and return to original filings for verification.
Decision reviews
Review mistakes, missed opportunities and risk rules without trading advice.
Reading system
Use reading to improve real decisions and long-term judgment.
Content
Programmer FIRE Retirement System: Using Compound Interest to Counter the Age-35 Career Half-Life
Programmer FIRE Retirement System: Investment review: record the information at the time, judgments, subsequent results, mistakes, risk positions, and next rules.
DCA vs. Lump Sum: When Dollar-Cost Averaging Helps—and When Cash Drag Hurts
Dollar-cost averaging (DCA) invests equal amounts at regular intervals. Compare DCA with lump-sum investing, cash drag, fees, risk, and a repeatable contribution plan.
The Ultimate Guide to Compound Interest: From Mathematical Principles to Automated Asset Management for Programmers
The Ultimate to Compound Interest: The Ultimate Guide to Compound Interest: Investment Review: Document the information and judgment at the time, subsequent outcomes, error points
Kunlun Tech Investment Review: Why Understanding the Thesis Wasn't Enough
A Kunlun Tech investment review about turning a business thesis into position sizing, falsification conditions, evidence tracking, and a bounded risk budget.
Why Linear Thinking Fails in Nonlinear Markets: An Investment Review
An investment review of why linear stories and historical overfitting fail in nonlinear markets, with rules for disconfirming evidence, position limits, and error tolerance.
How to Maintain Trading Discipline Under Pressure: An Investment Psychology Review
An investment psychology review of how stress breaks trading rules, and how position limits, exit conditions, cooling-off periods, and written reviews reduce impulsive decisions.
2025 Investment Review: System Volatility, Nonlinear Growth, and Antifragility Experiments
2025 Investment Review: Investment review: documenting initial observations, decision rationale, outcomes, mistakes, risk positions, and rules for next time.
The Retail Investor's Guide to Discipline, Part 01: Finding Logical Certainty Amid Market Noise
The Retail Investor's to Discipline, Part 01: The Retail Investor's Guide to Discipline, Part 01: Odds Model Audit.
Why Investors Sell Winning Stocks Too Early: Odds, Emotion, and Exit Rules
An investment review of why investors take profits too early and how fundamentals, odds, position limits, and phased exits can reduce emotional selling.
