senator bingaman?y much and thank all of you for being here to talk with us today -- >> thank you very much and thank you all for being here today to talk with us. i would like a little more clarification on as congress approaches this whole idea of tax reform, do we need to raise additional revenue? and mr. klein are says we do need to raise additional revenue. i understand chairman greenspan to be saying we do. i believe -- that is my interpretation. and the rest of you have said we do not, or maybe we do. dr. feldstein, maybe we you could -- maybe you could clarify. >> my view is that if we eliminate, or cap -- which is my preferences -- tax expenditures, we should spend some of that money to reduce deficits and some of it to reduce marginal tax rate. >> we should raise additional revenue, but it is a question of how we use the additional revenue. >> if you reduce tax expenditures, you automatically raise revenues. the question is, do you give it all back in the form of lower rates? >> and your view