S&P500 futures statistically trade higher overnight more often than not. If you just buy in the afternoon and sell in the morning you'll make money on average. Most traders won't do this even if you show them the data, because it's too simple and so it doesn't cater to their need to feel clever.
Discussion
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Two economists are walking down the street, when one of them says "Hey, look it's a $20 bill."
The other economist looks at him disappointedly and responds "You know better than that. If there were a $20 bill on the ground, someone would have picked it up already."
good job