chairman and thank you terry yellen for appearing today. you know that net exports that is to say trade imbalance has been in the substantial drag on gdp growth. the house and senate will soon go to conference on a customs bill that is part of a trade passage passed into law last month so my concern is and continues to be around the potential for our trade partners to undermine the value the free trade can have without strong enforceable provisions on current -- currency manipulation. during the debates the administration put forth the position and insisted it was impossible to do fine currency manipulation in any way for example with the imf definition of currency manipulation that would not have him paged on your ability to have accommodative monetary policy including quantitative easing in response to the downturn. my question to you is do you agree with that and specifically in what ways would for example of imf definition of currency manipulation prevented you from accommodating monetary policy? >> so i do with rape with the concerns t