Key idea
A little success convinces us we have a gift. That belief leads to more trading, more risk, and usually worse results.
Overconfidence is the investor's flattering delusion: after a few good picks, we conclude we have skill, and start trusting our judgement over evidence. It feels like competence. It usually leads to overtrading, taking bigger, more frequent bets, which quietly erodes returns.
Why overtrading costs you
| Overtrading brings | Which means |
|---|---|
| More transactions | More costs and taxes eating returns |
| More timing decisions | More chances to be wrong |
| More concentrated bets | Less diversification, more risk |
The evidence is humbling
Studies repeatedly show that the more people trade, the worse they tend to do, on average, after costs. Each trade carries fees and taxes, and each timing decision is a fresh chance to get it wrong. The quiet, boring investor who trades rarely usually beats the busy, confident one who trades often.
A run of good luck is easily mistaken for skill. The antidote is humility built into your system: a simple plan, few decisions, and the assumption that you cannot reliably out-trade the market. Doing less is often the winning move.
Finished reading?
Marking this complete counts today, and your streak becomes day 1.