Learn the why. Not just the what.
Investing fundamentals, market logic, and the discipline behind good decisions.
Compounding: The Arithmetic That Rewards Only Patience
Compounding is the strongest force available to an ordinary investor, and it earns that title precisely because it does almost nothing for years and then, quite suddenly, almost…
Correlation: Why Diversification Depends on What Moves Together
Owning a lot of things is not the same as being diversified. What matters is not your holding count. It is whether everything you own can fall at once.
The Equity Risk Premium: Why Owning Businesses Has Paid
Over long stretches of history, owning companies has paid more than lending money safely. That extra return has a name, a reason, and a warning attached to it.
How Prices Are Actually Set: The Auction Beneath the Screen
Every price on a screen is the residue of a continuous auction: the point where a buyer's top bid touched a seller's bottom offer, nothing more.
Inflation: The Quiet Erosion That Reshapes Every Decision
Inflation is the slow bleed in what a currency can buy, and it is the reason holding money "safely" is not the same thing as keeping it safe.
Information and Noise: Most of What You Hear Is Not a Signal
The overwhelming majority of market news is noise, movement without meaning, and an investor's first job is recognizing how little of what they hear is actually signal.
Interest Rates: The Price of Time and Why Everything Depends on It
An interest rate is simply the price of having money now instead of later. Because every asset is a claim on money that arrives later, that one price reaches into the value of…
Liquidity: The Service You Do Not Notice Until It Is Gone
Being able to sell what you own, at a reasonable price, whenever you feel like it, seems like a basic feature of markets. It isn't. It's a service other people provide voluntarily, and…
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…
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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…
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.
The Role of the Federal Reserve in Asset Prices
No single institution exerts more influence over asset prices than the central bank. Understanding how its decisions ripple through markets is essential to understanding why markets move as they do.
What "Market Structure" Actually Means
The phrase "market structure" is used constantly and defined rarely. At its core it describes the pattern of highs and lows that reveals whether a market is trending, ranging, or turning.