The 2026 World Cup ended with Spain lifting the trophy. Six weeks of it. The Scots drinking Boston dry, the Norwegians rowing on the subway and that night in June when the United States came out against Paraguay like a house on fire. A good number of games ended the way big soccer games do, tied, and then decided on penalty kicks.
Watch a shootout and you’ll see the same thing every time. The kicker steps up. The goalie picks a side and throws himself at it, full stretch, arms out. It looks brave. The numbers say it’s usually the wrong move.
In 2007, five Israeli researchers published a study in the Journal of Economic Psychology called “Action Bias Among Elite Soccer Goalkeepers: The Case of Penalty Kicks.” They separated the kicks nobody could have stopped from the ones a goalie had a real chance at. For the stoppable ones, they asked a plain question: Dive left, dive right or stay in the center? Staying in the center won by a wide margin. And almost no goalie did it. They dove, every single time.
The researchers brought the finding to the coach of the national team, expecting to hand him an edge. He wasn’t surprised. He’d run his own numbers and reached the same answer. When they asked why his goalie still dove, the goalie’s own words explained it: “I can’t just stay still and do nothing.”
That sentence is the whole problem. And it belongs to a lot more people than goalies.
Cross a street in Manhattan and you’ll press a walk button that isn’t wired to anything. Most of them stopped working years ago. The light runs on a timer. The button stays because standing at a curb doing nothing feels worse than pressing something that does nothing.
Psychologists call this the illusion of control. Ellen Langer named it at Yale in 1975: The sense that our odds of success are higher than the math says, just because our hand is on the button. She ran a small lottery. Some people picked their own ticket, others were handed one at random. Same odds either way. When she offered to buy the tickets back, the people who’d chosen their own held out for more than four times as much. The odds hadn’t moved. The feeling had.
We do the same thing with money. The feeling of control pulls us toward what we can touch: The stock we picked ourselves, the account we check twice a day, the rental we can drive past on a Sunday. It pushes us off the boring index fund that does its job while we sleep. Langer found the illusion grows with choice, familiarity and involvement. That describes most of what people do to their portfolios.
What More Research Actually Buys
Here’s where it gets expensive. More homework feels like it should buy better outcomes. Mostly it buys more conviction and conviction is what gets you to trade.
Brad Barber and Terrance Odean tracked 66,465 households at a discount broker from 1991 to 1996. The households that traded the most earned 11.4 percent a year. The ones that traded the least earned 18.5 percent. The market returned 17.9. So the busiest investors, doing the most work and feeling the most in command, finished about 7 points a year behind the ones who mostly sat still. They titled the paper “Trading Is Hazardous to Your Wealth.”
Charlie Munger said it in fewer words: “The first rule of compounding: Never interrupt it unnecessarily.”
The Price of the Fidgeting
All this activity has a name and a cost. The behavior gap is the distance between what investments return and what investors actually earn after their own buying and selling. Vanguard studied it and found that disciplined investing, particularly with consistency in an investor's equity allocation, beat hands-on “strategic” investing by 1.55 percent a year. Across the clients they looked at, that gap added up to roughly half a trillion dollars in lost wealth over the period 2013 - 2023. Morningstar ran its own version through 2023 and found the average investor gave up about 1.1 percent a year to bad timing. Two studies, one conclusion. Somewhere between 1 and 1.5 points a year, handed back for the feeling of doing something.
Now the part that stings. Knowing all this doesn’t fix it. The goalie knew. He’d seen his own coach’s numbers. He dove anyway. Investors do the same thing. They unpack a painful story about a trade gone wrong and land on the same line every time: “I knew better, but this one felt different.” It always feels different.
The fix is boring. Decide ahead of time what you’re going to leave alone and then leave it alone.
What’s Actually Yours
You can’t run the market. You can’t run rates, the economy or tomorrow’s headline. You watch those. The part that belongs to you is shorter and a lot less exciting. It fits on an index card:
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- A written financial plan you actually follow.
- How much you save and how much you spend.
- What you pay in taxes and fees.
- How diversified you are.
- How you behave when things get scary.
That’s most of it and it’s where nearly all of your real return comes from. Two things make the list easier to live with.
First, decide what winning means before you start. Most people don’t invest to see a bigger number on a screen. They invest for what the number lets them do: Retire, send a kid to school, give something away. Take only as much risk as that goal requires and let the plan run.
Second, don’t confuse being busy with getting somewhere. John Wooden used to tell his players that fools measure how hard they work while winners measure how smart they work. Watching CNBC all day, checking the account before coffee, calling yourself a student of the market: That’s activity. It feels productive and changes nothing.
So press the walk button if it helps. There’s no harm in feeling like you have a hand in things. Just remember what actually turns the light green. And the next time a shootout comes down to the last kick, watch the goalie. He’ll fling himself to one side with everything he has, sure he had to try something. The math says he’d have done better to stand still. So would most investors.
