Ed Seykota

In the early 1970s, Ed Seykota was one of the first people to run trading systems on actual computers, coding trend-following rules onto punch cards long before personal computers existed. His systems worked. His clients still lost money.

The pain: Time and again, Seykota watched clients receive a clear, tested signal from his system — and override it. They'd skip a trade they were scared of, or exit a winner early out of anxiety, or ignore a stop-loss out of hope. The system wasn't the problem. The human operating it was.

The lesson: Seykota's most famous line captures it exactly: <cite index="0-1">"Everybody gets what they want out of the market."</cite> Some traders unconsciously want excitement, or validation, or a reason to feel like a victim — and the market will happily hand them exactly that, dressed up as a "trading result." If your unconscious goal isn't purely "protect capital and let winners run," your results will quietly reflect whatever your real goal actually is.

Beyond psychology, his practical trend-following rules were simple and are still widely used: cut losses quickly and consistently, let winning trades run without a fixed target, manage risk as a small, fixed percentage per trade, and use a system to remove in-the-moment emotion — because his entire career was proof that even a good system fails the moment a human starts negotiating with it.