Quote:
Originally Posted by mrbaseball
Money management or trade management is the key to any winning approach. Obviously you need your edge (like a momentum breakout) but that edge isn't enough as it has to be managed effectively.
Whoever coined that old saying "Nobody ever went broke taking a profit" never traded a breakout system because taking off winners too early is what sinks most momentum breakout edges.
What I said it’s true and I will give you an example to understand better.
You say you can’t win playing breakouts with small RR but you can win with large RR.
An hypothetical share has $100 price. You want to buy 10 shares (you think you will win with 2:1 RR but you think you won’t win with 1:1 RR or lower).
We’ll assume the first 1:1 RR of your trade doesn’t have an edge (the shares moves with a random walk). We’ll assume you know the edge finishes at $120 and you know price can go down until $90 before your idea is invalidated (so you put your stop loss at $90). We’ll ignore spreads, commissions, etc.
If you enter at 100 and take profit at 110 you won’t win anything.
50% * $100 – 50% * $100 = 0
But you know there is an edge until $120. You have 2 choices: enter now at $100 (take profit at $120) or put a stop order and enter at $110 (take profit at $120).
Choice 1: let’s say you will win 40% of time $200 and lose 60% of time $100.
40% * $200 - 10% * 100 – 50% * 100 = $20
The 50 % you lost 100 in the 1:1 RR will still be loses, but from the 50% of your wins 10% are transformed into losers and 40% into double wins.
Choice 2: You won’t enter at 100 because there is no edge until $110 (the logical decision as you will see). You’ll enter at 110.
EV equation is: 40% * 100 -10% * 200 – 50% * 0
The 50% you lost 100 in the 1:1 RR will now be forfeited (you won’t enter at all in those trades), from the 50% of your wins 10% are transformed into double loses and 40% are 100 wins.
Your EV from choice 2 is $20.
When you enter at 110 you basically win 80% (40/50) of your trades $100 and lose 20% of your trades $200. The RR is only 0.5:1 but your EV is the same as in the other choice. Your variance is reduced so you should enter at 110. Between 100 and 110 there was no edge, so no point of entering without an edge even though RR was bigger.
I have given you an hypothetical example where you lose with 1:1 RR but win with 2:1 RR. If this is the case the logical decision would be to delay your entry and win only with 0.5 RR. This was a theoretical example but in practice I would highly doubt that you can’t win with 1:1 RR but you will win with higher RR. In practice if you really have an edge you’ll win with smaller RR but you possibly won’t be extracting maximal value (this depends on how long the edge is present).
In my book there is a difference between money management and trade management. I understand when you say money management things like Martingale, scaling out, scaling in, put arbitrarily small stop losses and big take profits in order to have big RR. Trade management is another thing and I also defined it in my first post: “you should enter a trade when an edge starts and exit when an edge ends”. This means take profit should be when you think the edge ends, and when you trail stop losses you should only trail them to the point there is no edge anymore. Moving to breakeven for example doesn’t make much sense unless this is also the point where the edge ends.