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system
why online brokerages sometimes allow free etf buying
user
the same reason a company would offer coupons. i'd guess they're just doing it as a way to entice people to do their investing with them. since it is any etf i doubt they are being compensated by the etf companies, as is sometimes the case (ishares does this with fidelity, for example). and they still get the commission on the sale.
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