Two traders, one chair

There are two traders in your chair.

The first shows up before the open. Coffee, flat book, clear head. This trader writes sensible rules and can't imagine breaking them.

The second shows up about forty seconds after a loss. This trader has the same account and the same memory, but a different priority: make that feeling stop.

Your plan is written by the first trader and executed by the second.

The first trader can't predict the second

Loewenstein's research on what he called visceral factors, and his later work on hot and cold states, points to a gap. In a calm state, people underestimate how much a strong internal pressure will change what they do once it arrives. That's why a morning plan can feel airtight and still fall apart by 10:06.

Trading adds its own version of that pressure. Prospect theory showed that people feel losses more strongly than equal gains, and may take more risk to avoid them. Coval and Shumway found that morning losses made professional market makers more likely to take above-average risk in the afternoon. Those were experienced people, doing the job for a living.

Why "be more disciplined" is bad advice

Telling yourself to try harder asks the second trader to behave like the first. It relies on your judgment at the very moment your judgment is under the most strain.

That's also why more screen time doesn't settle it. Experience teaches you what the moment looks like. It doesn't guarantee you'll feel nothing when it arrives.

What desks understood

A professional desk doesn't assume its traders are immune. It assumes the opposite. Limits are set away from the action, and someone other than the trader holds the line. A trader can be excellent and still be subject to a risk manager, because no one is expected to police themselves under pressure.

That structure isn't an insult to the trader. It protects the trader's career from one bad morning.

Retail traders usually have no such person. You're the portfolio manager, the trader and the risk manager at once, and the risk manager goes missing at exactly the wrong moment. For a closer look, read Inside a trading desk.

Next on the path: Decide once