Learn the why. Not just the what.
Investing fundamentals, market logic, and the discipline behind good decisions.
Mean Reversion and Its Limits
Mean reversion — the tendency of extended moves to eventually retrace — is one of the most-discussed patterns in markets. Understanding when it applies and when it doesn't is essential to using the concept without being used by it.
The Closing Auction and Why It Moves Markets
A look at how closing auctions concentrate enormous volume into seconds, and why this mechanism quietly shapes the official price used across the financial system.
Correlation: The Thing That Breaks in Crises
Correlations between asset classes are often stable over long periods, then suddenly rise sharply during crises. Understanding the mechanism explains why 'diversified' portfolios often fail exactly when diversification is most needed.
Sector Rotation: The Pulse Beneath the Market
The sequential leadership of different sectors through economic cycles is one of the most reliable patterns in market behaviour. Reading rotation as it happens is one of the more useful analytical disciplines.
Dark Pools and the Hidden Half of Trading
A look at how off-exchange trading venues shape price discovery and why a large share of daily volume never appears on a public order book.
Index Rebalancing: The Invisible Money in Motion
Every quarter, indices from S&P 500 to MSCI global benchmarks reconfigure their constituents. Trillions in passive assets follow mechanically. Understanding the mechanism explains a lot of otherwise-inexplicable price moves.
Market Makers, Spreads, and Why Zero-Commission Isn't Free
Retail brokerages stopped charging trading commissions in 2019. The trade did not become free — the cost simply moved to a different, less visible place in the market structure.
Order Flow: The Real Structure Behind Every Trade
Every trade is the meeting of a buyer and a seller at a specific price. The structure of the orders behind those meetings — the order flow — shapes what the price does next in ways the chart does not show.
How ETF Creation and Redemption Actually Works
The reason ETFs trade close to their net asset value is a specific arbitrage mechanism — creation and redemption — that runs in the background every day.
Why Liquidity Moves Before Price
Every price is a settlement between buyers and sellers, but the ability to trade at all — liquidity — moves ahead of price and shapes what happens when the tape wobbles.
Why Markets Are Hard to Beat: The Competition You Cannot See
When you buy because you think something is cheap, someone else is selling because they think it is dear. The uncomfortable question is what that someone knows that you do not.
Why a Company Can Report Excellent Results and Fall
A company posts record profits and its stock drops. Nothing has gone wrong. The market wasn't reacting to the profits, it was reacting to the gap between the profits and what everyone…
Who Is on the Other Side of Your Trade
Every purchase needs a seller. Before congratulating yourself on an insight, it's worth asking who took the other side, and why.
What a Share Price Actually Represents
A price isn't a measurement of what something is worth. It's a record of what one buyer and one seller managed to agree on, in the last moment they agreed on anything.
Volatility Is Not Risk: A Distinction That Changes Everything
Volatility measures how much a price moves. Whether that movement amounts to risk depends on something volatility itself can't tell you: how long you actually plan to hold.
Timeframes and Self-Similarity: Why the Same Patterns Appear at Every Scale
A price chart of a single day and one of a decade can look strikingly alike. That resemblance isn't coincidence, and it has real consequences for how markets should be read.
The Spread: The Cost You Pay Without Being Told
Commissions are visible, and these days often zero. The spread is invisible and never zero, and across enough trades, it's the bigger cost of the two.
Sector Rotation: Why Different Parts of the Market Take Turns
At any given moment, parts of the market are thriving while others struggle, and leadership passes from one to another in ways that look obvious afterward and invisible beforehand.
Risk and Return: Why the Two Cannot Be Separated
Wanting high returns without risk is the most common wish in investing, and the most dangerous. It doesn't just fail to come true. It describes something that cannot exist.
Reflexivity: When Prices Change the Reality They Reflect
Usually a price reflects reality. Sometimes the price becomes part of the reality it is supposed to reflect, and the ordinary relationship between the two falls apart.
The Mathematics of Leverage: Why Borrowing Cuts Both Ways
Leverage magnifies returns, which sounds great until you notice it magnifies losses just as reliably, and introduces a danger that has no equivalent on the way up.
Market Efficiency: What the Theory Does and Does Not Claim
The efficient market hypothesis may be the most misrepresented idea in finance: attacked for claims it never made, and defended for conclusions it doesn't actually support.
Market Cycles: The Pattern That Rhymes Without Repeating
Markets move through cycles of expansion and contraction. The pattern itself is real, but believing you can time it is where that pattern does most of its damage.
Luck and Skill: How to Tell Them Apart in Markets
When chance carries real weight in an activity, a good result is weak proof that the decision behind it was sound. That gap between outcome and quality is where self-deception takes…