I am signing because if there is a cheap and effective way to better our understanding of how to fight extreme poverty, then we should want to know about it.  And if Mr. Demombynes and Mr. Clemens are mistaken, then we should want to know that as well.  There is no reason not to discuss something as important as the MVPs, especially when important institutions and fine scholars are involved.  We should all be in favor of enhancing the visibility of academic debates.