Trade Like a Business: Mark Douglas's Five Truths
A losing trade is a business expense. Read that again, because your gut hates it.
Your gut wants the loss to mean something, that you were wrong, that the market cheated you, that you need to make it back right now. That reaction feels like accountability. It’s actually the most expensive instinct in trading, and it’s the reason the trade after a loss is so often the worst one you take.
There’s a fix that’s almost thirty years old and still undefeated. Mark Douglas laid out five fundamental truths in Trading in the Zone, and a 2026 audit of funded traders found the ones who reviewed those truths consistently held a 22% higher Sharpe ratio than those who didn’t. Same charts. Same strategies. Different relationship with uncertainty.
We lean on this framework hard at Hawai’i Trading Academy, because psychology is the pillar most traders skip and the one that actually decides who survives.
What are Mark Douglas’s five truths?
They sound simple. They’re not easy. Here they are, plain:
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