Trade Calm · Chapter 8
Cognitive Control
Cognitive control treated as a finite resource. The chapter explains how the prefrontal cortex depletes across a session and frames discipline as a decision budget that runs down with every choice. It shows how to protect that budget by automating routine calls and removing unnecessary decisions from the trading day.
From the chapter
Why your 9:30 AM trades make money and your 2:30 PM trades give it back, and what to do about it.
A trader I'll call Ben sent me, last summer, a one-page spreadsheet of his own trade data. He had been keeping the spreadsheet for eleven months. Every trade, with the time of entry, the time of exit, the size, the result, and a one-word note on what he thought of it after the fact. He had not done any analysis on the spreadsheet. He just knew, the way many traders know, that something was off, and he wanted me to look at it.
The pattern was visible in about ninety seconds.
Ben was a profitable morning trader. From the open at 9:30 AM through 11:30 AM, his win rate was 62%, his average win was 1.4 times his average loss, and his net P&L over eleven months on morning trades was positive $34,000. By any reasonable metric, the morning Ben was a competent, well-organized retail trader who would have been the envy of most of his peers if that was the entire dataset.
The afternoon Ben, from 1:00 PM through the close, was a disaster. Win rate of 41%. Average win equal to average loss. Net P&L over the same eleven months on afternoon trades: negative $38,000. Ben had spent eleven months making money in the morning and giving it back, and then some, in the afternoon. The morning Ben was funding the afternoon Ben's tuition in trader self-destruction. The afternoon Ben was the only thing standing between Ben and a retirement account.
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