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The main problem I see is how big money manipulates a share's price. Sometimes, they'll have the bid and the ask price on a stock. If you ever watch L2, you can see it. If they do that for Nasdaq, you know they are doing it on the DOW.
One can use an algorithm and predict what a stock is going to do to a high degree of certainty. What can't be predicted is how long it will stay in its current trajectory. The old saying "It takes money to make money" certainly applies. Over 60% of trades now are based on algorithms and that is the Big Money.
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