Two years, one realization.
I shut down my quant trading operation in 2021.
Not because the strategy stopped working. Because I finally understood why it had ever worked in the first place.
For roughly two years — 2020 through 2021 — I ran systematic strategies.
Built the infrastructure. Wrote the signals. Backtested across cycles.
Live performance tracked, mostly. The Sharpe wasn't embarrassing.
I told myself I had found something.
I hadn't found anything.
What I had was invisibility.
The edge that wasn't.
I was 21 when I started. Convinced I had cracked something other people hadn't.
That belief is useful at 21 — it makes you do the work. But the work was building toward a misunderstanding.
Here's the thing no day trader guru will ever tell you.
The edge was never the algorithm.
You make money in retail quant because your position size is small.
You're not exploiting an inefficiency. You're just too small for anyone to bother front-running.
That's not alpha. That's a market not caring about you yet.
When the market starts caring.
Try running the same strategy with $100 million (or even just $10 million).
The spread eats you alive. Your trades move the price.
The market that ignored you at $50K turns hostile at $5M.
The "edge" was never yours. It was just the market not bothering to take it from you.
When they do bother — your system disappears overnight.
I know because that's what happened to mine.
Why the course economy needs you confused.
This is the part the course economy depends on you not understanding.
An entire industry runs on the lie that the algorithm is the edge.
YouTube channels. Discord servers. $997 "systems." Six-figure cohort programs.
They need you to believe it.
If you knew the truth, you'd stop buying their courses. You'd start building something real.
The truth is uglier and more boring.
Most retail trading systems work until the moment they don't. And the moment they don't is the moment they start mattering.
To a market maker who notices your trades. To a regulator who closes the venue. To a competing fund whose models are bigger and faster than yours.
There's no honest version of this where the small operator wins forever.
What Quantopian was actually telling me.
Quantopian shut down in late 2020.
The hosted backtesting and the community capital it had offered evaporated. I kept going for a bit on my own infrastructure.
If you're finding this useful, I send essays like this 2-3x per week.
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But by 2021 I had to admit what the closure was telling me.
The platforms supporting retail systematic trading were dying because the underlying economics were dying.
The edge was never durable. It was a slow leak, and the leak was finishing.
So I shut it down.
Four lessons that scaled past trading.
What I learned from those two years isn't a trading lesson.
It's a survival lesson — about how to read markets, and yourself, honestly.
You will mistake luck for skill.
I did. The backtests felt rigorous. The live trades felt validated.
But the only honest read on a small operator's edge is whether it scales. Mine didn't. None of them do.
Effort is not edge.
I spent more hours on signal research in 2020 than I have spent on almost anything since.
The output was a system that, when scaled, was worth zero.
Hours don't compound if the underlying thing doesn't compound.
The product is the asymmetry, not the labor.
A small quant strategy is labor-intensive and asymmetry-light.
You are doing real work, in a position that disappears the moment anyone with capital notices you.
That's the opposite of what you want to build with your time.
Anyone selling certainty is selling a course.
The honest practitioners — the people running real capital — will tell you that markets are mostly noise, that most strategies decay, and that survival is the entire game.
The people selling certainty are the ones who need you to keep paying them.
The filter I now apply to everything.
The trading lessons turned out to be life lessons.
I haven't traded a system since. But every business I've built since runs on the same filter — the one I should have applied at 21.
If the only reason something works is that nobody is paying attention, it isn't yours. It's borrowed.
The bill comes due the moment somebody with capital decides the room is worth entering.
I run lean. I extract cash instead of chasing valuations. I avoid markets where my "edge" is just being too small to notice.
Because I've been that person.
You don't want to build your career on invisibility.
You want to build on something the market knows about, has tried to take from you, and couldn't.
That's the only edge that's actually yours.
Part of a series on what I've unlearned about investing. Next: Why I Sold My Index Funds in February.