Your stock is down 20%: average down, or cut? The maths most people skip
With the market in the red, everyone's asking whether to average down or exit. The more important question is how big that position should ever have been.
Why a 50% loss needs a 100% gain: the drawdown maths that humbles everyone
Losses and gains aren't symmetric. A 50% fall needs a 100% rise just to break even — the brutal arithmetic of drawdowns, and why avoiding big losses matters most.
Rebalancing: the quiet habit that keeps your portfolio from drifting
Over time your winners grow and quietly take over your portfolio, raising risk without you noticing. What rebalancing is, how it works, and how often it helps.
Stop-loss: the simple rule that keeps small losses small
The difference between investors who survive and those who blow up is often one habit — the stop-loss. Why big losses are so hard to recover.
Systematic investing vs discretionary trading: which has the edge?
Gut-feel trading vs rule-based systems. Why human emotion quietly costs money, and how a disciplined, systematic process builds the real long-term edge.
Why Picking the Best Stock Isn't Enough: Building a Resilient Equity Portfolio
Discover how to build a resilient model equity portfolio. Learn why equal capital weighting, rigorous stock selection, diversification, and strict entry-exit rules beat random stock picking.
Mastering Quantitative Backtesting: How to Test Stock Trading Strategies Across Past Market Cycles
Discover the hidden flaws in stock trading backtests. Learn how to eliminate data repainting, account for circuit locks, track signal distribution, and apply these same quantitative principles to model portfolio construction.
Should you average down a losing stock? Why a rules-based model won't
Averaging down feels smart and often isn't. Here's why adding to a losing position is so tempting, the risk it creates, and how a rules-based process avoids it.
How many stocks should a portfolio hold? The maths of diversification
Too few stocks and one blow-up ruins you; too many and you can't track them. The research-backed sweet spot for how many stocks to hold — and the simple maths behind it.
What is Position Sizing? A Simple Explanation.
Position sizing decides how much of your portfolio goes into each stock. Here's what it means, why it matters more than stock selection, and how to keep it simple.