Thats 80 % times stocks are actually-Sideways!!!, There is not 100% strategy its upto the person if its provide him proper Risk reward . Best is do that with 1 quantity and see the results for yourself for a month. PnL speaks for itself which no single person can answer. Just trade and see , trading is the best teacher of trading!!!
Whole of the stock market work on one simple principle. Just One!
If making money is this easy then everybody would have been billionaires.
The returns of trading or investing are Huge for profitable investors just because they( successful traders) are few in numbers and there are many many many losers.
Suppose 100 ppl came to trading pit with $100 each.
Only 3-4 will come out successful. Rest 96 people will lose all $100*96 = 9600.
That 9600 will be in pockets of that expert 4 traders.
So on 100$ investment each one made $2400…
There has been some research on the martingale strategy. Rarely people have lost 10+ straight trades. So you need to put a stop somewhere so you can fight another day/week.
Also if you have heard of James Cordier, some chatter on the forums say he blew up his hedge fund by option selling in Natural Gas and maybe over-leveraging with some form of Martingale. His clients lost all and actually ended up owing money.
And now when you Google his name the word “Laughing Stock” is an auto-complete suggestion. This guy btw is not a Noob. He is the author of the highly acclaimed book The Complete Guide to Option Selling