Mean Net Worth by Net Worth Group. Janet L. Yellen rsf 2016;2:44-59 Copyright © 2016 by Russell Sage Foundation. All rights reserved. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. Reproduction by the United States Government in whole or in part is permitted for any purpose. This article was presented as the keynote address at the fifty-eighth economic conference at the Federal Reserve Bank of Boston on October 17, 2014. Direct correspondence to: Janet L. Yellen at 20th Street and Constitution Ave. NW, Washington, D.C. 20551.