Increase the tax rate on high frequency trading (HFT) or on positions held for less than one day.

High frequency trading is increasingly being used by financial firms to make profits on positions held for just a few seconds. HFT
1) Gives firms unfair advantages (Goldman Sachs made a profit on trading EVERY day one quarter) that are not available to the average investor. As a result, individual investors are losing confidence in the fairness of the market and are pulling money out of the stock market in record numbers, hurting the economy.
2) The stock market is for investment purposes. Taxing investment gains can hurt the economy, taxing HFT gains should not impact general economy.
3) HFT can cause drastic swings in the stock market, like the flash crash.
4) Financial firms owe the American people for greatly contributing to the poor economy thru their reckless behavior.