What is a trading edge — and how do you actually know you have one?
Edge is the most over-used word in retail trading. Here is the working definition I use after fifteen years — and the four questions that separate a real edge from a story you tell yourself.
K
Kush
Lead writer
2 min read
Market closedEdge is the most over-used word in retail trading. Everyone claims one. Almost no one has it.
A working definition
Notice what is in the definition and what is not. Repeatability, expectancy, sample, invalidation — those are in. Confidence, conviction, vibe — those are out. Your edge does not care how you feel about it.
The four questions
- What is the setup? Describe it in a way another trader could replicate it. "I buy pullbacks" is not a setup. "I buy pullbacks to the 21-day on SPX within the first hour of a session that opened above prior-day VWAP" is.
- What is the sample? How many times have you taken this trade? If the answer is fewer than 30, you do not yet know whether you have an edge — you have a hypothesis.
- What is the expectancy? Win rate × average win minus loss rate × average loss. If that number is negative across your sample, your setup is not an edge — even if it feels right.
- What would invalidate it? If you can't articulate the conditions under which your edge stops working, you are not running an edge — you are running a religion.
An edge you cannot describe is an edge you cannot defend. Position size accordingly.