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Behavioral Investment Management: An Efficient Alternative to Modern Portfolio Theory, by Greg B. Davies, Arnaud de Servigny
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A Powerful New Portfolio-Management Standard for an Investing World in Disarray
“Three years of losses turn many smart investors with 30-year horizons into frightened investors with three-year horizons, driven to poor decisions by cognitive errors and misleading emotions. Greg B. Davies and Arnaud de Servigny combine great expertise from research and practice into smart portfolios that overcome cognitive errors and misleading emotions and drive investors to their long term goals.”
―MEIR STATMAN, Glenn Klimek Professor of Finance, Santa Clara University, and author of What Investors Really Want
“The coming of age of behavioral finance. An important book which uniquely combines up-to-date knowledge of both behavioral and quantitative finance to provide practical models grounded on robust understanding of investors as well as investments.”
―SHLOMO BENARTZI, professor and co-chair, Behavioral Decision Making Group, UCLA Anderson School of Management
“This book is both erudite and profound, and it acutely addresses the issues, controversies, and received wisdom of our troubled investment times. To comprehend it requires a considerable time commitment, but it may be a new investment classic.”
―BARTON M. BIGGS, Managing Partner, Traxis Partners
“Behavioral Investment Management first shows how modern portfolio theory can be extended to incorporate behavioral biases in individual decision making, and then demonstrates how this extended theory can be implemented to make investment decisions in a world that is very different from that assumed by traditional portfolio theory. All of this is accomplished in a coherent fashion with the use of easy-to-understand mathematics and is illustrated with data for a wide range of asset classes.”
―RAMAN UPPAL, professor of finance, EDHEC Business School
About the Book:
The past few years have been dreadful for investment management. The quantitative analytics that serve as the foundation of modern finance have proven to be incapable of providing value to investors. Modern Portfolio Theory now appears desperately old-fashioned and obsolete for one simple reason―it does not work. Picking up where traditional quant theory leaves off, Behavioral Investment Management offers a new approach to dynamic investing that addresses critical realities MPT ignores, including investors’ emotional impact on investing.
Written by leading money managers with expertise in both quantitative and behavioral finance, this cutting-edge guide shows institutional investment managers, retail investors, and investment advisors how to use the latest theories and techniques from the field of behavioral finance to construct better-performing portfolios. After systematically deconstructing MPT to illustrate why it does not work empirically, this one-of-a-kind book presents a reasonable framework for improving your ability to generate high-performing portfolios. The applicability and strategic consequences of this book’s approach set a new standard for portfolio development that will put you far ahead of the industry curve.
Complete with a new paradigm of best practices in dynamic portfolio construction that incorporates, and compensates for, the emotional reactions of investors, this hands-on book shows you how to:
- Move away from an idealized market view to a more authentic perspective
- Use the provided toolset and strategies to realize superior performance in real-world markets
- Seamlessly adapt the new approaches and techniques into your day-to-day operations
This book helps you gain a distinct advantage by providing micro and macro implications of applying behavioral science to investing. In addition to helping you better understand the needs of the individual investor, it examines the wealth management and pension fund industries and explains how behavioral science can create opportunities in these two sectors.
When making your next investment decision, let Behavioral Investment Management help you factor in the biggest financial variable―the human influence.
- Sales Rank: #1974391 in Books
- Published on: 2012-01-26
- Original language: English
- Number of items: 1
- Dimensions: 9.30" h x 1.20" w x 5.90" l, 1.48 pounds
- Binding: Hardcover
- 400 pages
About the Author
Greg B. Davies is Global Head of Behavioural and Quantitative Investment Philosophy at Barclays Wealth. His academic expertise bridges economics, philosophy, and psychology, and he has current academic affiliations with Oxford University and University College, London.
Arnaud de Servigny is the Global Head of Discretionary Portfolio Management and Investment Strategy at Deutsche Bank Private Wealth Management. Arnaud is also an Adjunct Professor of Finance at Imperial College Business School in London.
Most helpful customer reviews
6 of 8 people found the following review helpful.
Confusing. There are much better books on this topic than this one. See for yourself.
By Contrarian
This book is framed in sound behavioral finance findings. It seems to be addressed to individual investors. But it doesn't really explain things in ways that individuals could understand it. It has lots of equations that are not explained well and the writing uses jargon unnecessarily (I give a sample paragraph below). It never gets tangible enough to make it clear what they are talking about.
The advice varies dramatically from chapter to chapter. In chapter 7 (figure 7.21) they present a dynamic asset allocation model that moves from 70% in "safe assets" in late 2006 (I'm reading off a graph so I can't tell the exact dates) to 20% a few months later and ultimately down below 10% in June 2007. Then the "safe assets" are back up to 80% a few months after that and sit at 100% from July 2008 to Dec 2009. This is the less active, "target risk" model. Their "optimal" strategy frequently moves from 50% safe to zero and then back to 50% in a couple of months. This is because they estimate expected return and risk based on a short-term, backward-looking model. But, elsewhere in the book they emphasize the importance of sticking to a long-term plan and looking for a methodology that will reduce anxiety.
So, I don't know how anyone will benefit from this book. The only reason I can imagine for their writing it is that they expect to hand it to potential clients who will probably (ideally?) not read it but will be impressed that they wrote it.
Here is a "look inside" -- that is, a sample paragraph chosen more or less at random.
"For September 2010, we see that each level of risk tolerance will pick the portfolio where the indifference curve is tangential to the efficient frontier, that is, the portfolio that optimizes expected utility or, equivalently, desirability. Notice in particular that the portfolio chosen by the middle investor with T = 1 has monthly volatility of 6.1 percent (annual volatility of 21.2 percent), which is substantially higher than the constant 8 percent annual target. This may seem extremely risky for a moderate-risk investor, but recall that we deliberately selected this period because it represented a period of high expected returns. In this benign environment, when expected returns are high relative to risks, all investors should be taking more risk than usual rather than being stuck at an exogenously imposed constant level--in fact, even the low-risk-tolerant (T = 0.5) investor has an optimal portfolio with an annual volatility of 13.7 percent. This level will change optimally from period to period rather than being constrained by a constant target volatility that would be imposed without having the use of an appropriate indifference curve mapped to risk tolerance. Thus, even if we impose variance as a risk measure on the assets in our investment universe, the utility framework can still improve expected performance by choosing the right level of variance endogenously."
Servigny, de (2012-01-04). Behavioral Investment Management: An Efficient Alternative to Modern Portfolio Theory (Kindle Locations 4370-4379). McGraw-Hill. Kindle Edition.
Michale Pompian's books look much better Behavioral Finance and Investor Types: Managing Behavior to Make Better Investment Decisions (Wiley Finance)
Behavioral Finance and Wealth Management: How to Build Optimal Portfolios That Account for Investor Biases (Wiley Finance)
0 of 0 people found the following review helpful.
You have to applaud
By investingbythebooks
We live in troubled times. Since the dawn of time, which in this case means the late 70's, the asset allocation of pension funds has been governed by a mean-variance-optimization (MVO) process that springs from the so called modern portfolio theory (MPT). Then came the TMT-crisis. Confidence was shaken, but the alternative that emerged - The Yale Model - never really threatened MPT as it was built on a parallel process but added illiquidity, leverage and (potentially) increased diversification to the recipe. Then came the Leman-crisis. As the authors state "We did not abandon modern portfolio theory; it abandoned us." The now emerging alternative - risk parity - thus abandons MVO.
On the book cover it reads "An efficient alternative to [MPT]", yet in the introduction Greg Davies (Global Head of Behavioral and Quantative Investment Philosophy at Barkleys Wealth) and Arnod de Servigny (Global Head of Discretionary Portfolio Management and Investment Strategy at Deutsche Bank Wealth Management) says that they are not trying to "set a new holistic standard, a so called successor to [MPT]". Both statements are correct. The book presents a full MVO-model in the sense that it is possible to use in practice. However, it's not a theoretical alternative to MPT as some parameters are subjectively chosen. The model is an attempt to improve the MVO-process based on insights from behavioural finance. You have to applaud this approach. Behavioural finance excels in finding flaws with MPT but the discipline is seldom used in this more constructive way.
So what are the issues with MPT that the authors aim to correct? First, the use of normally distributed variance as a representative of the statistical distribution is clearly invalid for most assets. On top of this, the normal distribution assumes a linear and stable trade-off between risk and return in investors utility function, where Daniel Kahneman and Amos Tversy with their Prospect Theory instead shows risk aversion to be non-linear and dependant on whether returns are positive or negative. Secondly, MPT assumes stable correlations between assets (giving stable diversification benefits) and hence ignores the evidence for time-variations and regime dependence in both correlations and returns.
The 2 main features of the book are a) a "behaviourised" utility/risk function and b) a regime switching model to handle the different correlations and returns during times of stress versus more tranquil markets. The risk inconsistencies are handled first by adding the higher moments of the distribution, like skew and kurtosis, to the risk measure and secondly by adding an individual, subjective, risk tolerance factor to the equation. The regime switching model uses analysis of historical data to distinguish between different states of the world. The authors find that once their model has switched to a regime it stays there between 2 and 5 years. In the different regimes very different assumptions of correlations and returns go into a MVO-process with very different asset allocations as a result.
This is a seriously geeky book with its combination of portfolio theory and financial psychology and it's a relatively heavy read for the less mathematically inclined. Yet it is an unusual and important book that addresses several of the most acute topics discussed in pension funds today. Regime switching models are quite the rage currently and as they often use volatility based signals to differentiate between regimes, the difference in resulting allocation versus risk parity-strategies might in effect not be that large. It is also obvious that these models are active allocation strategies and as such they cannot be used by all investors collectively, i.e. they are not macro consistent (in fact it would be highly un-stabilising for the market if too many used the strategy). That doesn't mean that the models couldn't be good for those who use them. However, the behaviourising of the utility function is clearly very innovative work. I've not seen it anywhere else. If I could have wished for a more comprehensive coverage of one related topic it would have been the time variance in expected returns.
The authors show a clear understanding of psychology when concluding that it is better to have a slightly suboptimal portfolio that is possible to stay with, compared to an optimal portfolio that is psychologicaly unbearable and as such is sold at exactly the wrong time. As J.M. Keynes put it: "There is nothing so dangerous as the pursuit of a rational investment policy in an irrational world."
This is a review by investingbythebooks.com
6 of 9 people found the following review helpful.
Brilliant read
By manhattan
The book starts by clearly introducing the different players that make up the investment management universe. That description of a heterogeneous set of market participants sets the stage to describe the shortcomings of traditional portfolio theory. This book is no academic slouch - it spends some quality effort on providing guidance to remedy those shortcomings and incorporating your personality type into your portfolio!
There is a portion of the book devoted to enhancing a description of risk - by supplementing the usual standard deviation by measures of fat-tails and asymmetry. While one may disagree with the solution in the book, it provides enough material to start thinking and form one's own way of assigning tradeoffs between these statistical measures that are observed in real returns.
The final sections provide blueprints for managing portfolios that account for realistic behavior of asset returns. I am surprised this stuff is not taught in schools more, and put into practice. A great book. I wish I read it many years ago!
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