Transaction tax could cause volume to plunge, insider says

Thomas Peterffy, CEO at Interactive Brokers Group, said a tax on financial transactions could cause volume on the stock market to drop 90%. "The mother of all creators of havoc on Wall Street is this looming transaction tax," Peterffy said. "Trading volumes would plunge by about 90%, markets would become illiquid and tens of thousands of people would lose their jobs."

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