Unit 4 · Level 2 · Costs & taxes
Churning: activity as the enemy
That's the actual title of a famous study by Barber and Odean, who examined tens of thousands of brokerage accounts. The most active traders lagged the market by roughly 6 percentage points a year, buried by spreads, fees, taxes, and bad timing. Every trade is a small toll booth. Drive through often enough and the tolls, not the market, decide your outcome.
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What you get asked
Why does constant buying and selling drag down long-term returns?
Each round trip pays spreads and fees, may trigger taxes, and forces two well-timed decisions: exit AND re-entry. Stack up dozens per year and the leaks swamp the skill.
Put the classic churn cycle in order
Two toll booths and a missed rally, all to end up owning the same fund at a worse price. This cycle, repeated, is how portfolios underperform their own holdings.
In Barber and Odean's study, the most active traders lagged the market by roughly ___ percentage points a year.
Around 6 points a year, mostly self-inflicted through costs and timing. Compound that gap over a career and it's the difference between comfort and regret.
How is disciplined trading (like the Trading course teaches) different from churning?
A trader with the 1% rule and a plan accepts costs as a budgeted expense of a strategy. Churning is emotion generating transactions: same buttons, opposite games.
What's the best default rhythm for a long-term investor's portfolio?
Automation removes your itchy fingers from the equation: money flows in on schedule, tolls stay minimal, compounding runs uninterrupted. In long-term investing, boredom is a feature. 🐜
The rest of this unit
Fees, frictions, and tax drag: the leaks you can control.