There are already pre market trades this morning, reference my last post as it is a very gray area. Frequency trading also allows a jump on the regular markets as this usually means that a broker has a faster connection, usually in milliseconds, that gives them an edge, like a fiber connection closer to the action. And for those who do not believe this a Google will spell it out. On second thought, here it is: https://www.investopedia.com/terms/h/high-frequency-trading.asp
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