Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why can Robin Hood offer trading without commissions?
They make money off you by increasing the spread you buy and sell your stocks through them.  So for example, if the normal spread for a stock was $10.00 for a buy and $10.02 for a sell, they might have a spread of $9.98 for the buy and $10.02 for the sell. So for an order of 1000 shares (approx. $10000) they would make $0.02 per share which would equal $20.00.