Learn the why. Not just the what.
Investing fundamentals, market logic, and the discipline behind good decisions.
The Myth of a 'Fair Price' in an Ever-Changing Market
Investors frequently speak of a stock having a 'fair price'—a level to which it should return, a value it should reach, a target that represents what it is 'really worth.' This language reveals a static conception of value that the actual dynamics of financial markets do not support.
Why the Number You Bought At Is Irrelevant to the Market
One of the more freeing things an investor can internalize is that the market doesn't know, and doesn't care, what you paid for anything you own. Said plainly like that, it sounds…
The Allure of Complicated Trades That Never Work
There is a category of investment activity that feels productive, requires significant intellectual effort, generates interesting conversations, and reliably destroys wealth. It consists of the complicated trades—the multi-leg options strategies, the pairs trades, the macro calls expressed through derivative instruments—that absorb investor attention and erode investor capital with approximately equal consistency.
Why Fancy Financial Products Rarely Benefit the Buyer
The financial services industry is extraordinarily innovative in the creation of new products. It is considerably less innovative in creating products whose primary purpose is to benefit the buyer rather than the seller. Understanding this asymmetry is one of the most practically important insights available to the individual investor.
Why You're Still Waiting for the Stock to Return to 'Your Price'
Few numbers matter less to a stock's future than the price you happened to pay for it. The market has no record of your entry point, no interest in it, and no intention of organizing…
The Smart Investor Who Outsmarted Himself Into Poverty
The financial history of the twentieth and twenty-first centuries contains a recurring figure: the exceptionally intelligent investor whose very intelligence becomes the primary instrument of his financial destruction. He is not undone by ignorance or by simple emotional errors but by the sophisticated application of his analytical capabilities to a fundamentally flawed premise.
Why You Think Complex Strategies Beat Simple Ones
There is a pervasive assumption in investing that complexity is a proxy for sophistication, and sophistication a proxy for performance. This assumption is wrong in both directions—complexity is not reliably associated with sophistication, and sophistication is not reliably associated with superior returns.
The Danger of Falling in Love With a Stock's Story
Emotional attachment to a specific investment is one of the most reliable predictors of poor investment outcomes. It distorts the assessment of new information, makes selling psychologically prohibitive, and transforms a financial instrument into something much more loaded—a representation of one's identity, judgment, and values.
Why You Invest in Companies, Not Products
One of the most common and most expensive errors in individual investing is the conflation of product admiration with investment merit. The investor who loves a product naturally gravitates toward the company that makes it—but the quality of a product and the investment quality of the business that produces it are related only loosely and often not at all.
How the Media Convinces You to Buy at the Worst Time
The relationship between financial media coverage and optimal investment timing is almost perfectly inverted. The assets that receive the most enthusiastic coverage are typically those that have already appreciated most substantially, making them, on average, the worst candidates for new investment.
The Seductive Lie of a Compelling Founder Story
The cult of the visionary founder is one of the most powerful forces in contemporary investment culture. It produces some of the most significant valuation distortions in modern markets, and it exploits a bias so deeply embedded in human psychology that it survives even explicit awareness of its existence.
The Market Cycle You Keep Ignoring
Market cycles are among the most well-documented features of financial history. They recur with enough regularity that their general shape is entirely predictable, even if their specific timing is not. Yet each cycle manages to convince the majority of its participants that it is different from all prior cycles.
How Recent Losses Distort Your Entire Investment Strategy
A significant investment loss does not merely reduce one's wealth; it reshapes one's entire perception of risk, return, and the investment process. The portfolio decisions made in the aftermath of a significant loss are among the most consequential—and most reliably poor—that investors make.
Why a Good Story Doesn't Make a Good Investment
The human mind is built to process narrative, and built well. Stories pull us in ways that data and analysis simply don't; they generate emotional investment, they stick in memory…
Why Investors Always Fight the Last War
Military historians observe that generals reliably prepare for the last war rather than the next one—building the fortifications, doctrines, and equipment that would have won the previous conflict rather than the one they are about to fight. Investors commit exactly the same error with remarkable consistency.
The Mistake of Extrapolating a Bull Market Into Forever
Bull markets are extraordinarily effective at convincing their participants that they are permanent. This is not a coincidence. The psychological conditions that bull markets create—rising wealth, confirmed beliefs, social validation—are precisely the conditions that make scepticism most difficult to maintain.
Why You Think What Happened Last Year Will Happen Again
Recency bias—the systematic tendency to overweight recent experience in forming expectations about the future—is among the most pervasive and costly cognitive errors in investing. Its mechanism is simple, its effects are profound, and its correction requires deliberate effort.
Why Your Financial Goals Should Be Yours Alone
The most basic error in personal financial planning is chasing goals that belong to someone else. A goal shaped by social expectation, peer comparison, or cultural convention rather…
The Wealth Race You Can Never Win
The competitive framing of wealth accumulation—as a race with other participants, with winners and losers determined by relative position—is one of the most damaging mental models available to the individual investor. It is also one of the most pervasive.
Why Watching Others Get Rich Makes You Take Stupid Risks
The sight of others accumulating wealth rapidly is one of the most reliable triggers of poor investment decision-making. It activates a complex of emotions—envy, urgency, self-doubt—that systematically distort risk assessment in ways that produce predictably bad outcomes.
The Trap of Relative Wealth: Why 'Enough' Never Feels Like Enough
One of the most underappreciated risks in personal finance is the failure to define what is enough. Without a clear concept of sufficiency, wealth accumulation becomes an open-ended pursuit that generates its own dissatisfaction regardless of the absolute level achieved.
Why Comparing Your Portfolio to Your Neighbor's Is Destroying You
The habit of measuring one's financial position against others' is among the most reliably destructive in personal finance. It transforms investing from a rational pursuit of one's own goals into a competitive exercise with no finish line and no winner.
How Social Media Turns Investors Into a Herd
The history of financial markets contains many episodes of collective irrationality. What distinguishes the contemporary investment environment is not the basic psychological mechanisms of herd behaviour, but the infrastructure through which those mechanisms now operate.
Why 'Everyone Is Doing It' Is the Worst Investment Strategy
Consensus, in financial markets, has a peculiar property: by the time it forms, it has already been priced in. The investor who acts on consensus is not getting ahead of the market—she is arriving after the market has already processed the same information.