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Re:Stock-trading app Robinhood was rejected by 75 investors by JumpCrisscross on Sunday May 13, 2018 @02:26PM (#17060226)
> Can you explain what the phrase "book business" means?

You accumulate a “book” of end customers, usually from a particular demographic, for the purpose of selling to someone who doesn’t have that demographic. Versus flow (e.g. exchanges) or asset accumulation (e.g. ETFs) businesses.

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