To submit a comment on an article that has appeared in the Review of Economic Dynamics, please follow these guidelines. First send a copy to the author and explain that you are considering submitting the comment to the Review of Economic Dynamics. Second, when you submit the comment, please include any response that you have received from the author. Comments on published articles will be considered only if they are accompanied by a letter stating that this process has been completed. If an author does not respond to your comment after a reasonable time, this should be explained in the accompanying letter. Authors will be invited to submit for consideration a reply to any comment of this kind that is accepted for publication.