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To my regret, you are not right, dear marlboroza. One of these two investors takes the entire bank. That is, he will take 2 dollars and will receive a profit of 100%.
And if they reinvest?
What if first "donor" is waiting for $8? 8 people will lose money. What if they win and reinvest 8$? 16 "donors" will lose money. And so on. It seems that you don't understand how ponzi works or you are just playing dumb.