High speed massive stock trades are something relatively new but are now pervasive on Wall Street. What do they mean for the larger economy? To control any dangerous volatility, Europe is moving quickly to institute a miniscule financial transactions tax, and more Americans are talking about the idea as well. On this segment, Sarah Anderson, Global Economy Project Director at the Institute for Policy Studcies explains what a financial transactions tax is, the arguments for and against it, and how it might affect ourt economic stability.