Why Investors Willingly Pay Speed Traders Extra BillionsBy
When high-frequency traders defend themselves against criticism that they’re screwing up the stock market by distorting prices or making it more volatile, their argument usually goes like this: Yes, but we’ve lowered the costs of trading. Which is true, in a way. The bid-ask spread for many stocks—the difference between what it costs to buy or sell a share—is often just a penny, much narrower than it used to be. As speed traders have proliferated over the last few years, they’ve made the U.S. stock market considerably more liquid, meaning there’s almost always someone willing to take the other side of your trade.
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