Why would a stock broker let you short a stock?

I don't fully understanding the concept of shorting a stock, but I was wondering why anyone would let a person "borrow" their shares so that that person can short it. If people believe that a certain stock will go down in value, then who would want to let someone short their stock? Are there other... show more I don't fully understanding the concept of shorting a stock, but I was wondering why anyone would let a person "borrow" their shares so that that person can short it. If people believe that a certain stock will go down in value, then who would want to let someone short their stock? Are there other parts to shorting that the broker makes money off of?
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