IMO much of these methods are rather outdated. You can gain general knowledge but specifics might not make sense anymore.
You should look up and try to understand kelly like HolyGralSeeker mentioned. Even that gets confusing though between discrete and continuous kelly.
I think 1-2% is popular because that is what the discrete kelly fraction looks like for a stream of bets that barely has an edge and the average trader is going to have a small edge at best. Betting more would just make the system worse. It is also a size that keeps a losing system trading longer.
On the other hand, continuous kelly for buying and holding something like NVDA the past year is absolutely huge. There are even periods with QQQ that continuous kelly is over 100%. Of course, we don't know this until after the fact. For trading systems I would suspect we haven't figured out how to use kelly properly yet because it is really discrete streams of highly correlated, varying continuous kelly bets.
I knew someone that took a small account to a few million during the dot com boom and then before the financial crisis. They were a highly optimistic person in general and would basically go in huge on calls before AAPL earnings in 2005 for instance. Their edge was basically being both a degenerate gambler and highly optimistic as the bull market climbed a wall of worry. Of course, they gave a ton back during the financial crisis and I lost touch with them.
I am a huge Jesse Livermore fan but he was also obviously a degenerate gambler. So much so that even after making 100 million in the crash he killed himself a decade later because he couldn't trade the great depression the same way and thought himself a failure.
10k to 40 million in a few years is not much different than asking how the powerball lottery winner made their billion dollars IMO. The marginal utility of a dollar would cause a non-degenerate gambler to scale back well before anything close to 40 million and at the same time the non-degenerate is not going to risk enough to even get to a million in 2 years from 10k.
If you only have 10k, once you even have a 100k a normal person is going to ensure they never go back to only having 10k again. Once you have a million you aren't going back to a 100k but to get to 40 million in a short time you would need to have to risk going back to $10k from a million. That is something only a total degenerate gambler would risk.
- Also am I reading this correctly?: "If you want to make big returns, then you absolutely must concentrate your capital in a strongly-trending stock, and position sizes of 1 to 2 percent of one’s total portfolio equity are, to put it bluntly, quite wimpy from an O’Neil perspective. The O’Neil method of pyramiding into strongly acting positions while weeding out weaker ones generally gets an investor concentrated in the right stocks during a bull market cycle. At times, your authors have been fully invested in as few as two stocks, using full, 200 percent margin, so that each position represents 100 percent of the account’s gross equity."
(from Morales/Kackers book: Trade like an O'Neil Desciple) Question being: are they saying that if I have a $10,000 account that I am literally risking as much as I can and allot $10,000 buying power on one stock and $10,000 on a second stock? Holy pucker factor. Or am I understanding this wrong?