Market Structure Nightmare Comes True in N.Y.’s Barclays Lawsuit

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For years, brokers and traders have assured anyone who cast aspersions on America’s electronic stock market that the concerns don’t add up. Then came Eric Schneiderman.

New York’s attorney general has spent a year digging for dirt on two of the main features of modern market structure, dark pools and high-frequency trading. This week, he hit a vein with a 30-page complaint against Barclays Plc.