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A comment on Stock-trading app Robinhood was rejected by 75 investors. Parent comment

Re:Stock-trading app Robinhood was rejected by 75 investors by frutiger on Sunday May 13, 2018 @02:27PM (#17060227)
If you look on any exchange or broker for any security, the sell price at any given time will almost always be lower than the buy price. The instantaneous gap between the sell price and the buy price is known as the spread.

This spread reflects how much the exchange makes.

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Re:Stock-trading app Robinhood was rejected by 75 investors by optionsguy on Sunday May 13, 2018 @04:04PM (#17060741)
Market makers profit off the bid/ask, not exchanges.
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Re:Stock-trading app Robinhood was rejected by 75 investors by adrr on Sunday May 13, 2018 @05:04PM (#17061040)
They also get rebates for trades from the exchanges to encourage liquidity.
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Re:Stock-trading app Robinhood was rejected by 75 investors by vostok on Sunday May 13, 2018 @03:57PM (#17060695)
It's a very indirect relationship to how much the exchange makes.
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