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If you can ignore the butterfly effect, I'd use the last digit of the closing price of 100 different stocks.

Stock prices are hard to predict in the first place[1]. And the last digit will be the hardest digit to predict.

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[1] You could get very rich if you knew how. Lots of people want to be rich, yet basically nobody is doing it successfully.




Even if you could: your actions based on that knowledge would alter the price again, such that any method you devise to predict stock prices will a) have to factor that into its calculations and b) by definition will only work for a single user.




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