Cognitive Bias

Professional active managers lose to the index. That much is settled. The part nobody puts on the poster: individual investors lose to both — and they do it holding the same funds that beat the professionals. The settled part, quickly # Active investing means trying to beat the market: picking stocks, buying actively managed funds, or holding themed active ETFs. Passive means tracking an index and accepting its return.

You can win an argument and end up with an enemy, which is a bad trade you make instantly and pay for slowly. The skill worth having isn’t out-arguing an aggressive person. It’s coming out of it with your point intact and the relationship still there. First, make it clear you’re not here to fight # Once voices rise and people start talking over each other, both sides stop processing anything. Everything after that is noise. So the first job is lowering the temperature, and it’s mostly mechanical:

Go through your portfolio line by line and ask one question of each holding: is this here because the numbers say so, or because of how it makes me feel? Most portfolios are mostly fine. The damage sits in two or three positions bought for comfort. Dividend funds are a tax bracket, not a personality # The single most common feelings-holding in a young portfolio is a dividend ETF. SCHD is the usual suspect, with a following that treats it as a permanent fixture.

The feeling of being financially behind is mostly manufactured. It comes from comparing your complete finances against other people’s visible ones, on a scorecard that moves the moment you reach it. The people setting your benchmark are often financed # Looking wealthy is cheap and fast. A leased car, a designer bag on a payment plan, a holiday booked before it’s paid for — all of it is available to anyone with a decent credit limit and a tolerance for interest.

Investor archetypes can be lined up from most to least evidence-backed. Almost everyone starts somewhere in the middle of that line, having skipped the part where you justify the move. The spectrum isn’t a menu — it’s a ladder you climb by proving something first. The order, from strongest evidence to weakest # Index Fund → Value / GARP / Dividend → Growth → Contrarian → Real Estate → Angel → ESG → Gold → Crypto → Momentum → Options → Day Trader / Quant.

Most men replace shoes by buying the same shoe again. The bulky black trainer, the square-toed dress shoe, the heavy brown loafer — twenty years of loyalty to a style that suited a different body and a different wardrobe. Loyalty to an old shoe isn’t timeless taste. The question before any purchase # Does this fit the man I am now, or the man I used to be?

Seven of the most expensive purchases people make in their twenties share one feature. In every case, the person selling collected their money whether or not the thing worked. Once you check for that asymmetry, most of these transactions stop being tempting. The test, stated once # Before any significant purchase, ask: does this person’s outcome depend on mine?

By the time a recession is officially declared, the economy has usually been in one for the better part of a year — and the market has often already turned. Every instinct that says “wait for confirmation” is calibrated to information that arrives too late to use. Who decides, and how long they take # There’s a rule of thumb — two consecutive quarters of falling GDP — and then there’s the actual process. In the US, the National Bureau of Economic Research’s Business Cycle Dating Committee makes the call, weighing employment, income, industrial production and spending rather than GDP alone.

A 25-year-old has put $4,000 into a whole life policy sold to him by a family friend, and wants to know whether to walk away. Wrong question. The $4,000 is spent either way. The only live question is what the next eight years of premiums are for. Why the product is hard to evaluate on purpose # A whole life premium splits three ways: the death benefit, the cash value that’s presented to you as an investment, and the commission for whoever sold it. That third slice is why the first two are hard to see.

In February 2020 the market was at record highs. A month later it had fallen 34% in weeks, the fastest crash in history. Twenty-two million Americans lost their jobs in a fortnight — and the market then rose 30% in two months. Nothing was broken. The two things were never measuring the same thing. One looks backward, one looks forward # Economic data reports what already happened. Unemployment figures, GDP, inflation — all describe a period that has finished.

The biggest driver of whether someone retires comfortably isn’t their salary, their fund picks, or their willpower. It’s whether a form was ticked for them on their first day. Automatic enrolment does more work than every piece of financial advice combined. The size of the gap # Vanguard’s data on this is stark. Employees who were automatically enrolled had a 94% participation rate in 2025. Employees who had to sign themselves up: 64%. Thirty percentage points, from a default.

The Tablets Nobody Reviewed # Taking diphenhydramine daily for three years is associated with a 54% higher risk of dementia than taking the same dose for three months or less. It’s sold over the counter as a sleep aid. Nobody reviews it, because nobody prescribed it. The problem isn’t the drugs — it’s the absence of a review # Most medication harm in older people doesn’t come from a dangerous prescription. It comes from a reasonable prescription that was never revisited after the reason for it passed.