People who make money investing in the stock market

I think they are called '' day traders'' because they sell for other people not for themselves it's a job that they do for money, that  person their are selling for pays them because a stock marker is where inventors gives their inventions to other people and that person sell it for them, they also have people from all over the world to give them opinion about what they think the about the inventions to see what they should fix .

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