And you're looking at a thread in which two different people have posted code.
Both the people made the same error.
And you have not yet said what that error is. In fact you flatly refused to on several occasions. The supposed error does not in fact exist.
You were right when you said that the artificial situation of just two accounts exaggerated the effect; That doesn't mean there was an error -- the bias unquestionably exists.
So I only have one question; why are you pretending to have a problem understanding this?
Already answered why ur model is incorrect. Sorry, I'm not going to waste my time on every guy who does a logical error.
Nope, sorry. Remember, You flatly refused to explain. You don't get to flatly refuse to explain, and then claim that you did.
The model is correct; The only question is, does it matter? And the answer given the broader simulation above is, probably not. With many accounts no one having more than a small fraction of the total money, the bias is very small. But it definitely does exist.