The issue focused on the week of Sept. 12, when the government set a government-wide tax on short-term financial transactions, as part of a plan to tax high-frequency trading.

The government said the tax on high-frequency trading is part of a government-wide plan to tax high-frequency trading, and that the tax is not new.

A government official said the government's tax on high-frequency trading is "unprecedented" in the government's tax code, and