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Investors and Markets:
Portfolio Choices, Asset Prices, and Investment Advice
William F. Sharpe

Book Description | Reviews | Table of Contents

COPYRIGHT NOTICE: Published by Princeton University Press and copyrighted, © 2006, by Princeton University Press. All rights reserved. No part of this book may be reproduced in any form by any electronic or mechanical means (including photocopying, recording, or information storage and retrieval) without permission in writing from the publisher, except for reading and browsing via the World Wide Web. Users are not permitted to mount this file on any network servers. Follow links for Class Use and other Permissions. For more information, send e-mail to permissions@press.princeton.edu

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PREFACE

THIS BOOK IS based on the Princeton University Lectures in Finance that I gave in May 2004. The invitation to present these lectures provided me a chance to address old issues in new ways and to bring together a number of interrelated topics in financial economics with an emphasis on individuals’ saving and investment decisions.

I am grateful to Professor Yacine Ait-Sahalia of Princeton, the series editor, and to Peter Dougherty of Princeton University Press for inviting me to undertake this project and for giving me valuable advice throughout.

This work follows a tradition with strong Princeton roots. In the first (2001) Princeton Lectures in Finance, Stephen Ross masterfully addressed the central issues associated with asset pricing. That work is now available as the first book in this series: Neoclassical Finance (Ross 2005).

In 2001 Princeton University Press published the first edition of John Cochrane’s marvelous book, Asset Pricing (Cochrane 2001), which is fast becoming a standard text for its target audience—“economics and finance Ph.D. students, advanced MBA students, and professionals with similar background.”

My goal is to continue down the path set by Ross and Cochrane, using a somewhat different approach and providing several extensions. However, this book differs substantially from the work of Ross and Cochrane in both approach and motivation. I am primarily concerned with helping individual investors make good saving and investment decisions—usually with the assistance of investment professionals such as financial planners, mutual fund managers, advisory services, and personal asset managers. This requires more than just an understanding of the determinants of asset prices. But for many other applications in finance, it suffices to understand asset pricing. For example, a corporation desiring to maximize the value of its stock can, in principle, simply consider the pricing of the potential outcomes associated with its activities. A financial engineer designing a financial product may need only to determine a way to replicate the desired outcomes and compute the cost of doing so.

Appropriately, Ross concentrated on the ability to price assets using only information about other assets’ prices in his first chapter: “No Arbitrage: The Fundamental Theorem of Finance.” The title of Cochrane’s book indicates a similar focus, as does his statement in the preface that “we now go to asset prices directly. One can then find optimal portfolios, but it is a side issue for the asset pricing question.”

However, to determine the best investment portfolio for an individual, one needs more than asset prices. To use the standard economic jargon, individuals should maximize expected utility, not just portfolio value. To do so efficiently requires an understanding of the ways in which asset prices reflect investors’ diverse situations and views of the future. I thus deal here with both asset pricing and portfolio choice. And, as will be seen, I treat them more as one subject than as two.

Over the past year and a half I have benefited greatly from comments and suggestions made by a number of friends and colleagues. Without implicating any of them in the final results, I wish to thank Yacine Ait-Sahalia, Princeton University; Geert Bekaert, Columbia University; Phillip Dolan, Macquarie University; Peter Dougherty, Princeton University Press; Ed Fine, Financial Engines, Inc.; Steven Grenadier, Stanford University; Christopher Jones, Financial Engines, Inc.; Haim Levy, Hebrew University; Harry Markowitz, Harry Markowitz Associates; André Perold, Harvard University; Steven Ross, Massachusetts Institute of Technology; and Jason Scott, Jim Shearer, John Watson, and Robert Young, Financial Engines, Inc.

Finally, I express my gratitude to my wife Kathy for her support and encouragement. We are proof that a professional artist and a financial economist can live happily and productively together.

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File created: 8/7/2007

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