Better to teach reality than ideology, assuming you want to be a practitioner instead of a theorist.
FWIW, I don't advocate blind trust.
Perhaps you meant to say we should teach the reality that cheating exists and is bad; not to pretend it doesn't exist? Or that it's hopeless to be honest and trustworthy because some others may not be? Which leads to ... apathy or more cheating and less trust.
I think the lesson, which has served me well, is to not make short-term trades.
If you got into Nvidia ten years ago you would have to be dumb not to pull it now. There is market timing foolery, and then there is just being realistic.
What saved me is one of these trading contests for my school's business club. I signed up for it and dumped all of my "money" into playboy and forgot about it. Turns out they won some big lawsuit and the stock spiked just in time. First place was a $200 dollar fine. I had to have the club president spot me the train ticket to go pick it up.
That family friend seems like a complete idiot for passing on that information.
Plus a stock split on its own has no change to the value of a stock. There’s no reason for it to double overnight. In fact the direct effect on the price is the opposite as you have twice (or K times) as many shares and each is worth half (or 1/K). So the net effect is zero.
[1] https://www.sciencedirect.com/science/article/pii/S016726812...
What a colorful turn of phrase.
And i agree that he shouldn't have told me. A few years later i actually told him something along those lines. I appreciated it but he exposed himself to a lot of legal risk.
At the time we had a family friend that was working for a company about to announce a stock split along with a very good earnings report. He told me when to go all in on that stock, and i did exactly that. The day after that split my portfolio had more than doubled, beating the class record by a significant margin. Said record stood until the teacher retired.
Not sure if it was the lesson he meant to impart though since I think most took away from it that to win you need to lie, cheat and steal.