Quote from goodday:
I had a chance to read a little bit about "martingaling" over the weekend. I don't believe I would be interested in doubling my position after I have a loss and I don't like either the assumptions behind it or the increased risk that comes with the execution of this principle. Maybe I don't understand it well enough to appreciate its finer points, but I think I will pass on it.
Whether Martingale approach would work, depends on the expectation ratio. The most important thing to remember is that in a casino you rely on pure luck as there is a max bet size that prohibits a calculated gambler from eventually succeeding, if luck turns sour. So let's assume that after 8th draw you have reached the ceiling and have to start from the beginning, that is a strategy that relies on luck of the draw, therefore it sucks.
But in a trading environment, markets are locked within multiple temporary TIGHT price ranges, creating multiple support and resistance levels. Identifying the most tradable S/R levels will increase the odds of success in applying the Martingale within 2-3 attempts to breakout of these levels, as markets will never be locked in those TIGHT ranges. If your system somehow relates to S/R breakouts, then one can look into Martingaling, I do.
Example: It is 5:46am EST now and ES is trading a range of 84/80.75, would I use Martingale upon a break of one of these levels, I wouldn't. Of course eventually it will make a breakout, but upon which time? 2?4?6?10?18? I have no idea on the expectation ratio. On another hand, if one has a max probability of 3-4, I say Martingaling is usable. Everything depends on back-testing, position/money management and being able to identify the right TIGHT S/R ranges.