I believe markets are driven by a certain logic. It seems unpredictable and random when you don't know what that logic is. Markets are affected by fundamentals, valuations, economic data, news etc which adds to the illusion of randomness.
Many things that are not random now, were random a few centuries ago. Newly aquired knowledge was responsible for the transition from random to not random over the years.
The systems can be directional,the thing is designs based on only probability and risk/reward stopped or work periodically. As this is directional trade there needs to be some kind of count implemented if we are in possibility of trending market -favorable condition.Not in the specific time frame,but risk/reward sequence positive +2 is enough to initiate the trade.Money is made from initial trade going to profit target before being stopped at a loss.The ones that get stopped out are a grind to just about breakeven,not Martingale and units are not plainly added(more like numbers replaced by new).Then there are triggers do i trade new total very next trade or with a delay from a method which on next trade changes bet amounts and takes every next trade or it's new delay regardless what the count.As this method profit chart will bounce at some point from negative to slightly positive(it is all about the shortest period to achieve the objective),could be many trades,but it won't be Martingale so it is OK.That could be worthless as amount of trades from a sequence will bring costs to equal what trying to recover,but at least this won't happen often enough not to implement it. Sequence is good enough to bring to break even,not statistically valid for a profitable method on it's own,which is why this isn't looked at as primary way to make money from it. The most important is logic for a delay as this helps to eliminate some trades in a whipsaw sequence.A lot comes from methods applied from roulette table,this like any other method is NOT proverbial Holy Grail I don't know enough to voice an opinion about hedging,arbitrage or options.
I do not support the probability theories or market effeciancy theories, as they are just more academic mumbo jumbo! Trading, or trying to make money, is no different now to what it was over 100 years ago. The only things that have changed are the available vehicles, most of which need not concern the average punter in the street. It really is very simple, so simple that most never ever even consider it, even though it is straight in front of them every time they turn on the PC, and now the mobile phone as well! The funny part is, none of which most speak about is required. There is no need for 10,000 hours of screen time, no need to understand mainstream TA or any other such thing that distracts your attention from what is actually happening! The world is full of experts and gurus, but each and every one of them has to make a shite just like everyone else.. really no difference at all
trading the roller-coaster, it is so simple! It is incredible how people likes to get distracted by nonexistent complexity and technical mumbo-jumbo