estimation methods in portfolio selection and the effectiveness of short sales restrictions uk evidence forecasting the mean returns vector and the covariance matrix is a key feature in implementing portfolio theory the performance of the bayes stein method for forecasting these parameters for use in the markowitz model with and without short sales was compared with that of seven other estimation methods and three alternative portfolio selection techniques this paper represents the first large scale empirical investigation of the usefulness of the bayes stein approach using historical data this data was drawn from the london stock exchange in contrast to earlier studies the relative performance of bayes stein was mixed while it produced reasonable estimates of the mean returns vector there were superior methods e g overall mean for estimating the covariance matrix when short sales were permitted when short sales were prohibited actual portfolio performance was clearly improved although there was little to choose between the various estimation methods

does diversification destroy value evidence from the industry shocks does corporate diversification reduce shareholder value since firms endogenously choose to diversify exogenous variation in diversification is necessary to draw inferences about the causal effect we examine changes in the within firm dispersion of industry investment or diversity we find that exogenous changes in diversity due to changes in industry investment are negatively related to firm value thus diversification destroys value consistent with the inefficient internal capital markets hypothesis measurement error does not cause this finding we also find that exogenous changes in industry cash flow diversity are negatively related to firm value r 2002 elsevier science s a all rights reserved jel classification g34

internal capital markets and the competition for corporate resources this article examines the role of corporate headquarters in allocating scarce resources to competing projects in an internal capital market unlike a bank headquarters has control rights that enable it to engage in winner picking the practice of actively shifting funds from one project to another by doing a good job in the winner picking dimension headquarters can create value even when it cannot help at all to relax overall firm wide credit constraints the model implies that internal capital markets may sometimes function more efficiently when headquarters oversees a small and focused set of projects this article analyzes the process by which internal capital markets channel limited resources to different uses inside a company in so doing it seeks to address two related sets of questions first what is the fundamental economic rationale for creating an internal capital market that is under what circumstances can it make sense to combine several technologically distinct projects under one roof and have them seek funding from corporate headquarters as opposed to setting them up as stand alone companies that each raise external financing on their own second given this rationale what is the optimal size and scope of an internal capital market should headquarters be involved in funding a large number of projects or just a few and should these projects be unrelated to one another or in similar lines of business the answers to both sets of questions flow from the insight that in a credit constrained setting where not all positive npv projects can be financed headquarters can create value by actively reallocating scarce funds across projects for example the cash flow generated by one division s activities may be taken and spent on investment in another division where the returns are higher or alternatively one division s assets may be used as collateral to raise financing that is then diverted to the other division simply put individual projects must compete for the scarce funds and headquarters job is to pick the winners and losers in this competition

comovements in national stock market returns evidence of predictability but not cointegration abstract this paper is a response to the literature that tests for cointegration between national stock market indices it argues that apparent findings of cointegration in other studies may often be due to the use of asymptotic rather than small sample critical values in fact economic theory suggests that cointegration is unlikely to be observed in efficient markets however this paper finds evidence for the predictability of relative returns and the existence of a winner loser effect across 16 national equity markets a conclusion is that national stock market indices include a common world component and two country specific components one permanent and one transitory

central local relations in china during the reform era the economic and institutional dimensions abstract central local relations are a core but problematic issue in china s reform process the conventional wisdom is that the economic reforms have considerably weakened control by the central government over economic activities in the localities political implications are derived directly from these economic observations the prevalent view is that the economic reforms have reduced the political control of the center and indeed have called into question the viability of china as a single political entity this article disputes these views it shows that economic decentralization has been accompanied by a strengthening of china s unitary political system this has direct bearings on local economic conduct because of the political and institutional constraints local officials surrender tax revenues to the central government and curb their inflationary investment demand

trying to explain home bias in equities and consumption investors hold a substantially larger proportion of their wealth portfolios in domestic assets than standard portfolio theory would suggest a phenomenon called equity home bias in the absence of this bias investors would optimally diversify domestic output risk using foreign equities therefore consumption growth rates would tend to co move across countries even when output growth rates do not empirically however consumption growth rates tend to have a lower correlation across countries than do output growth rates a phenomenon i call consumption home bias in this paper i discuss these two biases and their potential relationship as suggested by the literature

industry rotation in the u s stock market 1934 1986 returns on passive semi passive and active strategies abstract this paper compares the returns to three distinct sets of approaches to industry rotation in the u s stock market passive semi passive and active using the 12 industry breakdown of breeden gibbons and litzenberger 1989 the passive strategies are based on the up and down levered value weighted industry indices and the semi passive strategies are similarly constructed from the equal weighted industry indices the active strategies are based on multiperiod investment theory and the empirical probability assessment approach applied to past realized returns the semi passive and active strategies performed well in both the full 1934 1986 period and in the 1966 1986 subperiod achieving statistically significant excess returns in several instances

improved estimates of higher order comoments and implications for portfolio selection in the presence of nonnormally distributed asset returns optimal portfolio selection techniques require estimates for variance covariance parameters along with estimates for higher order moments and comoments of the return distribution this is a formidable challenge that severely exacerbates the dimensionality problem already present with mean variance analysis this article extends the existing literature which has mostly focused on the covariance matrix by introducing improved estimators for the coskewness and cokurtosis parameters we find that the use of these enhanced estimates generates a significant improvement in investors welfare we also find that it is only when improved estimators are used that portfolio selection with higher order moments dominates mean variance analysis from an out of sample perspective the author 2009 published by oxford university press on behalf of the society for financial studies all rights reserved for permissions please email journals permissions oxfordjournals org oxford university press

optimal portfolio of foreign currencies with borrowing and lending until the late sixties most american corporations held their liquid assets in the form of cash short term government notes and other highly liquid marketable securities since the early seventies more and more firms have begun to hold their current assets in foreign currencies beyond what would be required to conduct normal foreign operations in the last few years companies have accumulated and retained much more cash than they held in the past in order to understand the magnitude of this issue realize that at the end of 1977 cash and short term securities held by international business machines amounted to 5 4 billion by exxon 4 2 billion and ford and general motors held well above 3 billion obviously with this cash pile up most companies devote much attention to cash management even a slight improvement in the management of these assets means a substantial profit and firms have responded with highly trained staff in particular people familiar with the international money market and the investment opportunities available the change in attitude toward cash management may be summarized by the following quotation from a senior adviser to the j henry schroder bank and trust company companies are no longer looking at a bank balance they re looking at a

monetary conditions and international investing we examine the relationship between monetary conditions and global stock returns previous studies established that u s stock returns during expansive u s monetary periods are significantly higher than returns during restrictive periods we found that this pattern prevails in non u s markets furthermore the pattern exists relative to both local and u s monetary conditions by examining several investment strategies we show that investors could have improved portfolio performance in the period studied by using both u s and local monetary conditions to guide their portfolio allocations using monetary conditions to determine portfolio composition would have been consistently beneficial throughout the past 30 years

home bias in equity portfolios inflation hedging and international capital market equilibrium we test whether the home bias in equity portfolios is caused by investors trying to hedge inflation risk the empirical evidence is consistent with this motive only if investors have very high levels of risk tolerance and equity returns are negatively correlated with domestic inflation we then develop a model of international portfolio choice and equity market equilibrium that integrates inflation risk and deadweight costs using this model we estimate the levels of costs required to generate the observed home bias in portfolios consistent with different levels of risk aversion for a level of risk aversion consistent with standard estimates of the domestic equity market risk premium these costs are about a few percent per annum greater than observable costs such as withholding taxes thus the home bias cannot be explained by either inflation hedging or direct observable costs of international investment unless investors have very low levels of risk aversion article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

massaging mean variance inputs returns from alternative global investment strategies in the 1980s this paper explores the impact of adjustments to the inputs on total returns terminal wealth and portfolio turnover in an unconstrained monthly mean variance mv asset allocation over time it is well known that mv allocations are very sensitive to small forecast errors in the means and covariances this sensitivity is especially pronounced for errors in means one way to control this sensitivity to forecast errors is to use stein estimation we examined three naive applications of stein estimation for six individual country stock indexes five country bond indexes and five cash indexes this study has two major conclusions first any of the suggested adjustments to inputs dominate the results of an unadjusted input mv optimization adjusted input portfolios have higher mean return less variance and greater terminal wealth than unadjusted input portfolios second these improvements become even greater with transaction costs

the interrelationships between u s and foreign equity market yields tests of granger causality this study examines the interrelationships between yields on the u s and several foreign market portfolios over the 1980 89 period tests of granger causality are used to investigate the effects of uni directional causality bi directional causality and contemporaneous adjustment in the determination of market rates of return the results indicate that international equity market returns are largely contemporaneously determined and the significance of contemporaneous effects varied over time uni directional and bi directional causality were found to be relatively weak

the behavior of stock prices on ldc markets abstract the paper investigates the behavior of stock prices for a group of well established and newly emerging ldc securities markets the results suggest the probability distributions to be consistent with a lognormal distribution with some securities exhibiting non stationary variance ldc markets even though not as efficient as major dc markets are quite comparable to the smaller european markets and the behavior of security prices as reported in this study appears to be generalizable for the heavily traded segments of ldc markets

immigration and equity home bias abstract why do investors hold such large positions in domestic equity when there are gains to be made from international diversification this equity home bias puzzle has received considerable attention in the literature with asymmetric information on domestic and foreign assets whether by individual choice or by market imperfection emerging as the most plausible explanation what happens when we consider a subset of investors whose information sets are closer to investors in foreign countries i assess the relationship between immigration and equity home bias and find that inward migration is positively correlated with increased foreign equity positions and reduced home bias looking across income groups outward migration reduces home bias for relatively rich countries but may actually increase home bias when migration occurs to or from a developing country these results suggest that immigration generates a positive externality of increased information flows for developed countries but not for developing nations the effects of immigration on investment are strongest within the euro zone suggesting that this positive externality of immigration is largest when barriers to portfolio diversification such as currency risk are lowest

money bonds and foreign exchange in the theory of finance capital markets provide securities which allow the ownership of productive assets to be allocated among investors according to their willingness to bear risk in exchange for return and independently of their tastes for the productive services provided by the assets this paper uses the theory of finance to study the role of money as a productive asset and the transformation of money into a portfolio asset true to its purpose the capital market provides securities nominal bonds that allow an allocation of the current services of the money supply according to its current productivity and without regard for its future purchasing power risk and an allocation of the future purchasing power risk of the money supply according to the willingness of investors to bear this risk in exchange for return and without regard for investor needs for the future transactions services of money in open

is it inefficient investment that causes the diversification discount diversified conglomerates are valued less than matched portfolios of pure play firms recent studies find that this diversification discount results from conglomerates inefficient allocation of capital expenditures across divisions much of this work uses tobin s q as a proxy for investment opportunities therefore hypothesizing that q is a good proxy this paper treats measurement error in q using a measurement error consistent estimator on the sorts regressions in the literature i find no evidence of inefficient allocation of investment the results in the literature appear to be artifacts of measurement error and of the correlation between investment opportunities and liquidity diversif ied conglomerates appear to trade at a discount relative to matched portfolios of pure play firms studies documenting this stylized fact include lang and stulz 1994 berger and ofek 1995 comment and jarrell 1995 and servaes 1996 recent empirical work has sought to find the source of this diversification discount building on the theoretical work in milgrom and roberts 1990 stein 1997 and scharfstein and stein 2000 on the inefficiency of internal capital markets this literature has asked specifically whether diversified firms allocate their capital expenditures inefficiently across divisions the canonical answer has been yes and has been supported by two types of evidence first studies such as lamont 1997 shin and stulz 1998 shin and park 1998 and rajan servaes and zingales 2000 all find that internal capital markets in conglomerates transfer funds across divisions in a suboptimal manner second studies such as berger and ofek and scharfstein 1998 provide evidence suggesting that the divisions of conglomerates do not respond adequately to investment opportunities in comparison to single segment firms however these findings about divisional investment may be an artifact of measurement error most of these studies rely on tobin s q the market value of the capital stock divided by its replacement value as a proxy for investment opportunities and tobin s q is likely to be a poor proxy shin and stulz

industry divestiture waves how a firm s position influences investor returns because of the opaque nature of divestitures investors face considerable uncertainty in evaluating divestiture decisions and thus may look to a firm s social context defined in terms of the per

bayes stein estimation for portfolio analysis in portfolio analysis uncertainty about parameter values leads to suboptimal portfolio choices the resulting loss in the investor s utility is a function of the particular estimator chosen for expected returns so this is a problem of simultaneous estimation of normal means under a well specified loss function in this situation as stein has shown the clas sical sample mean is inadmissible this paper presents a simple empirical bayes estimator that should outperform the sample mean in the context of a portfolio simulation analysis shows that these bayes stein estimators provide significant gains in portfolio selection problems

disagreement portfolio optimization and excess volatility disagreement a key factor inducing trading has been receiving ever increasing attention in recent years most research has focused on disagreement about the expected returns several authors have shown that if the average belief coincides with the true expected return in the portfolio context prices are unaffected by disagreement in this paper we study the pricing effects of disagreement about return variances we show that i disagreement about variances has systematic and significant pricing effects more disagreement leads to higher prices and ii prices are very sensitive to the degree of disagreement even if the average belief about the variance is constant tiny fluctuations in the disagreement about the variance lead to substantial price fluctuations this second result may offer an explanation for the excess volatility puzzle when small changes in the degree of disagreement occur they induce relatively large price changes yet the changes in disagreement may be hard to directly detect empirically leading to apparent excess volatility

portfolio turnpike theorems risk aversion and regularly varying utility functions models which incorporate both uncertainty and the dynamic behavior of economic agents are difficult to analyze 2 moreover even when a solution is obtained it can seldom be simply stated and rarely lends itself to straightforward interpretations an example of an appealingly understood result is a turnpike theorem which states that if the planning horizon is distant then the optimal policy can be approximated by a wealth independent policy our paper develops an analogous result in a stochastic intertemporal model of portfolio selection in fact we obtain necessary and some sufficient conditions for a turnpike the problem considered in this essay is that of an investor a von neumannmorgenstern expected utility maximizer who invests for a finite horizon and consumes only his terminal wealth at the beginning of the first period the investor allocates his wealth w among various assets and at the end of the first

a half century of returns on levered and unlevered portfolios of stocks bonds and bills with and without small stocks in two earlier papers grauer and hakansson 1982 grauer and hakansson 1984 we applied the multiperiod portfolio theory of mossin 1968 hakansson 1971 1974 leland 1972 ross 1974 and huberman and ross 1983 to the construction and rebalancing of portfolios composed of u s stocks corporate bonds government bonds and a risk free asset borrowing was ruled out in the first article while margin purchases were permitted in the second the probability distributions used were naively estimated from past realized returns in ibbotson this paper applies multiperiod portfolio theory to the construction and rebalancing of portfolios composed of u s stocks corporate bonds government bonds and a risk free asset with small stocks included as a separate investment vehicle probability assessments are based on the past joint empirical distribution our principal findings are 1 small stocks while totally ignored at times entered even the most riskaverse portfolios most of the time and 2 small stocks when chosen tended to replace common stocks except in the 1970s and early 1980s when they were primarily held in lieu of the risk free asset presented at the australian graduate school of management and at macquarie university both in sydney southern methodist university duke university the university of southern california the london graduate school of business and the annual meeting of the western financo association in scottsdale arizona the authors thank the participants of these seminars especially michael brennan and ehud ronn for helpful comments financial support from the social sciences and humanities research council of canada and the financial research foundation of canada is gratefully acknowledged the authors also wish to thank changwoo lee for research assistance and are greatly indebted to frederick shen for computational assistance

mountain or molehill downward biases in the conglomerate discount measure abstract the berger and ofek 1995 excess value measure comparing a conglomerate s actual market value to an imputed value based on standalones has become the standard method to determine value effects of diversification in this paper we address a significant bias in this procedure stemming from the difference in cash holdings between diversified and standalone firms excess values are based on firm values including corporate cash positions as standalones hold significantly more cash the imputed cash value is higher than the conglomerate s actual cash value resulting in a downward biased excess value we thus propose to calculate excess values based on enterprise values replacing total debt by net debt based on an extensive us sample we show that there is significantly less evidence of a diversification discount when adjusting for the cash bias in terms of average dollar losses the firm value based models overestimate the conglomerate discount by at least 25 apart from removing the cash bias we propose a second modification to the excess value measure arguing that standalone industry multipliers should be calculated using geometric mean aggregation instead of median aggregation

global property investment and the costs of international diversification there is a trade off between the costs and benefits of international diversification this paper shows that the costs for property investors can be reduced substantially through investments in public real estate companies which concentrate on their local domestic market we compare the performance of 18 international operating property companies over the sample period 1984 through 1995 with the performance of property companies operating on their domestic market we find that the international companies underperform the domestic companies we also find this difference is not due to factors such as transaction costs leverage and currency

portfolio selection an alternative approach this paper provides a solution to the portfolio diversification problem based on finding optimal weights that will result in maximizing the risk adjusted return of the underlying portfolio subject to the budget constraint contrary to the standard approach that aims at finding the required weights based on minimizing the variance of the portfolio subject to the budget constraint a mathematical proof is given for the suggested solution an application is provided to the portfolio diversification opportunity between all the share market indexes of the two largest economies in the world the results show that the portfolio created by our suggested approach leads to almost one percent increase in the risk adjusted return compared to the portfolio created by the standard method

information asymmetry valuation and the corporate spin off decision we empirically analyze the information hypothesis that the separation of a rm s divisions into independently traded units through a spin o enhances value because it mitigates information asymmetry about the rm consistent with this hypothesis we nd that rms that engage in spin o s have higher levels of information asymmetry compared to their industry and size matched counterparts and the information problems decrease signi cantly after the spin o the gains around spin o s are positively related to the degree of information asymmetry and this relation is more pronounced for rms with fewer negative synergies between divisions finally rms with higher growth opportunities and rms in need of external capital show a higher propensity to engage in spin o s they also raise more capital following a spin o which is consistent with the view that

performance of portfolios optimized with estimation error we explain the poor out of sample performance of mean variance optimized portfolios developing theoretical bias adjustments for estimation risk by asymptotically expanding future returns of portfolios formed with estimated weights we provide closed form non bayesian adjustments of classical estimates of portfolio mean and standard deviation the adjustments significantly reduce bias in international equity portfolios increase economic gains and are robust to sample size and to nonnormality dominant terms grow linearly with the number of assets and decline inversely with the number of past time periods under suitable conditions sharpe ratio maximizing tangency portfolios become more diversified using these approximation methods it may be possible to assess before investing the effect of statistical estimation error on portfolio performance

cvar models with selective hedging for international asset allocation abstract we develop an integrated simulation and optimization framework for multicurrency asset allocation problems the simulation applies principal component analysis to generate scenarios depicting the discrete joint distributions of uncertain asset returns and exchange rates we then develop and implement models that optimize the conditional value at risk cvar metric the scenario based optimization models encompass alternative hedging strategies including selective hedging that incorporates currency hedging decisions within the portfolio selection problem thus the selective hedging model determines jointly the portfolio composition and the level of currency hedging for each market via forward exchanges we examine empirically the benefits of international diversification and the impact of hedging policies on risk return profiles of portfolios we assess the effectiveness of the scenario generation procedure and the stability of the model s results by means of out of sample simulations we also compare the performance of the cvar model against that of a model that employs the mean absolute deviation mad risk measure we investigate empirically the ex post performance of the models on international portfolios of stock and bond indices using historical market data selective hedging proves to be the superior hedging strategy that improves the risk return profile of portfolios regardless of the risk measurement metric although in static tests the mad and cvar models often select portfolios that trace practically indistinguishable ex ante risk return efficient frontiers in successive applications over several consecutive time periods the cvar model attains superior ex post results in terms of both higher returns and lower volatility

the impact of conglomeration on the option value of equity abstract using contingent claims analysis i quantify the effect of risk reducing corporate diversification on the value of equity as a call option on firm assets the impact of conglomeration on firm risk is heavily conditioned on firm size in contrast to small firms the risk of large firms does not decline with increasing conglomeration accounting for this effect the expected equity discount is much lower than commonly assumed and can even turn into a premium if the path dependency of equity is incorporated my results stand in direct contrast to those of mansi and reeb 2002 and caution against using asset substitution as a qualitative argument for explaining economy wide value phenomena

the benefits from international diversification for nordic investors abstract in this paper we investigate the magnitude of the benefits from international diversification from the nordic point of view special attention is paid to whether potentially increased co movement of stock markets together with more volatile nordic currencies have resulted in decreased benefits from international diversification towards the end of the 1980s moreover the paper presents evidence on the benefits from international diversification for a currency which has recently started its free float the finnish markka fim we find significant increases in stock market co movement both unhedged ex ante strategies as well as strategies hedged for exchange rate risk are investigated revealing substantial benefits from international diversification for the nordic countries however we obtain mixed results concerning the question of the optimality of hedging

home bias in open economy financial macroeconomics standard theory would predict that investors hold a well diversified portfolio of equities across the world but despite the process of financial globalization investors still hold a disproportionate share of local equities in their portfolio the equity home bias french and poterba 1991 we review the various explanations of this puzzling phenomenon in the context of recent developments in macroeconomic modelling that have allowed to incorporate sophisticated international portfolio choices in standard two country general equilibrium models we refer to this literature as open economy financial macroeconomics we focus on three broad classes of explanations i hedging motives in frictionless financial markets real exchange rate and non tradable income risk ii asset trade costs in international financial markets such as transaction costs differences in tax treatments between national and foreign assets iii informational frictions and behavioural biases these recent developments raise the need for new portfolio facts beyond the equity home bias and we will present some new evidence on cross border asset holdings across different types of assets equities bonds and bank lending we also present some new micro data on institutional holdings of equity at the fund level these data should inform macroeconomic modelling of the open economy and a growing literature of models of delegated investment

do constraints improve portfolio performance the discrete time dynamic investment model using only historical data in various asset allocation settings often produces significant abnormal returns however the model does not choose the diversified portfolios that theory suggests it should therefore in this paper we compare the investment policies and returns of the model with and without constraints on the mix of risky assets the constraints lead to appreciably more diversification and less realized risk but only at the cost of less realized return visual comparisons of compound return standard deviation plots and statistical comparisons of jensen s alpha suggest that the reduction in return is not worth the reduction in risk for more risk averse investors ex post utility and certainty equivalent returns suggest that it is the results however illustrate the problems associated with using ex post utility to measure performance 2000 elsevier science b v all rights reserved

60 years of portfolio optimization practical challenges and current trends abstract the concepts of portfolio optimization and diversification have been instrumental in the development and understanding of financial markets and financial decision making in light of the 60 year anniversary of harry markowitz s paper portfolio selection we review some of the approaches developed to address the challenges encountered when using portfolio optimization in practice including the inclusion of transaction costs portfolio management constraints and the sensitivity to the estimates of expected returns and covariances in addition we selectively highlight some of the new trends and developments in the area such as diversification methods risk parity portfolios the mixing of different sources of alpha and practical multi period portfolio optimization

territorial competition in china and the west chien s s and gordon i territorial competition in china and the west regional studies in modern western societies and most other economies to which it has spread territorial economic competition is associated with a combination of competitive electoral politics and private land ownership in mainland china however a very strong form of this competition has emerged without either of these supports in general the development of such local collective action and its particular effects reflect an interaction between materially interested local agents and structural pressures the difference in china is that these agents are principally local government leaders whose career prospects within a still centralized system depend upon performance in terms of economic criteria set from above chien s s et gordon i la competition territoriale en chine et dans l ouest regional studies dans les societes occidentales d aujourd hui et dans la plupart des autres economies auxquelles elle s est etendue la

spin offs divestitures and conglomerate investment we examine whether spin offs or divestitures cause improvements in conglomerate investment efficiency at issue are endogeneity of these restructuring decisions and correct measurement of investment efficiency endogeneity is a problem because the factors that induce firms to spin off or divest divisions may also improve investment efficiency measurement error is a problem because efficiency measures employ tobin s q as a noisy proxy for investment opportunities we find important differences between firms that divest or spin off and a control sample after accounting for these differences and for measurement error in q we find no evidence of improvements in investment efficiency

international listings of stocks the case of canada and the u s the globalization of financial markets has seen ever increasing numbers of firms choosing to list their stocks on foreign exchanges we examine whether the extent of economic and financial market integration or segmentation between a firm s home country and listing country influences stock price reaction by examining the case of two similar countries the u s and canada during the 100 days before the week of interlisting in the u s risk adjusted stock prices of canadian firms rise on average by over 9 4 rise by an additional 2 around the interlisting date but follow with a corresponding drop of 9 7 in the 100 days after interlisting we interpret this evidence to be consistent with the financial market segmentation between canada and the u s however a subsample of canadian resource firms does not exhibit these stock price effects suggesting industry related factors may also be an important determinant of integration we also find average trading volume in interlisted stocks more than doubles in the months following interlisting

confidence in the familiar an international perspective one striking feature of intemrnational portfolio investment is the extent to which equity portfolios are concentrated in the domestic equity market of the investor the home bias puzzle i examine the role of investors perception of foreign investment risk on their portfolio choices the expected retumrns and risk of foreign investment are specified through an asset pricing model with the home portfolio being the benchmark asset pastor s 2000 domestic capm the model serves as a reference point around which investors can center their prior beliefs i focus on investors prior beliefs that are consistent with the literature on confidence in the familiar foreign equities in terms of both expected returns and risk being viewed less favorably than domestic equities these prior beliefs are then combined with the data on g7 equities and the revised beliefs are used to obtain the global optimal asset allocation to hold predominantly domestic equities each g7 investor has to believe that the risk of foreign investment is several times higher than the actual risk the home bias is more of a puzzle for a u s investor during the 1970s specifying investors prior beliefs around the world capm does not help resolve the puzzle

bayesian and capm estimators of the means implications for portfolio selection abstract this paper compares active investment policies under three alternative models for estimating expected stock returns the historical sample mean a shrinkage or bayesian estimator and a capm based estimator the out of sample performance of actively managed u s industry portfolios is analyzed for these three estimators over the period 1931 to 1987 it is found that the classical method based on historical means and covariances leads to the worst forecasts and out of sample performance and is generally outperformed by shrinkage estimators an active portfolio with expected returns based on the capm produced the best results among all actively managed portfolios this strategy as we show closely matches a simple buy and hold the market rule

efficient portfolios when housing needs change over the life cycle abstract we address the issue of the efficiency of household portfolios in the presence of housing risk we treat housing stock as an asset and rents as a stochastic liability stream over the life cycle households can be short or long in their net housing position efficient financial portfolios are the sum of a standard markowitz portfolio and a housing risk hedge term that multiplies net housing wealth our empirical results show that net housing plays a key role in determining which household portfolios are inefficient the largest proportion of inefficient portfolios obtains among those with positive net housing who should invest more in stocks

divisional diversity and the conglomerate discount evidence from spinoffs abstract existing literature argues that disparity in investment opportunities within diversified firms can erode firm value we investigate the diversity cost hypothesis of spinoffs by using post spinoff data to 1 reconstruct the diversified firm after the spinoff and assess the aggregate improvement in value and 2 relate any value improvements to changes in diversity we find that improvements in aggregate value depend significantly on changes in both a direct measure of diversity and measures based on industry proxies we conclude that diversification discounts at least partially reflect a value loss due to the diversified nature of the firm itself rather than selection bias or measurement error

sensitivity analysis for mean variance portfolio problems this paper shows how to perform sensitivity analysis for mean variance mv portfolio problems using a general form of parametric quadratic programming the analysis allows an investor to examine how parametric changes in either the means or the right hand side of the constraints affect the composition mean and variance of the optimal portfolio the optimal portfolio and associated multipliers are piecewise linear functions of the changes in either the means or the right hand side of the constraints the parametric parts of the solution show the rates of substitution of securities in the optimal portfolio while the parametric parts of the multipliers show the rates at which constraints are either tightening or loosening furthermore the parametric parts of the solution and multipliers change in different intervals when constraints become active or inactive the optimal mv paths for sensitivity analyses are piecewise parabolic as in traditional mv analysis however the optimal paths may contain negatively sloping segments and are characterized by types of kinks i e points of nondifferentiability not found in mv analysis

structure and performance global interdependence of stock markets around the crash of october 1987 using a new data source on share price indices this paper finds no evidence that the substantial variations in the reactions to the crash of october 1987 across countries are related to the structure of markets however trading halts and capital controls on residents may have moderated the speed of declines in some markets the paper also examines one measure of interlinkages between markets the trading of foreign stocks on domestic markets and finds this to be closely related to interdependence between markets

the m form hierarchy and china s economic reform for 13 years from 1979 to 1991 economic reforms in china have generated a significant growth its gnp grew at an average annual rate of 8 7 or at 7 37 for per capita gnp 1 the chinese economic performance is in contrast to that of eastern europe and the former ussr the average growth rate of gdp in hungary was 1 8 between 1981 and 1985 and almost zero in 1988 and 1989 in poland the average gdp growth rate was less than 2 between 1981 and 1989 from both theoretical and policy perspectives china s outstanding reform performances and associated differ ent reform strategies from those of eastern europe and the ussr are particularly interesting and puzzling there are two popular views in explaining the differences between china and eastern europe the first view states that china was at a much lower development stage than eastern europe and the ussr 3 the second view argues that china has followed a gradual and piecemeal approach as

asset pricing in partially segmented markets evidence from the finnish market this paper analyzes asset pricing in a partially segmented market where citizens of a small country are allowed to hold only their domestic securities whereas the rest of the investors foreigners are essentially allowed to hold all securities in this market setting it may occur that the citizens of the small country are willing to pay less for their domestic securities than are the foreign investors the paper derives equilibrium required rates of return for different investors in this market setting which perfectly occurred in finland and tests this equilibrium model using data from the finnish stock market empirical results are consistent with the hypotheses derived from the model several studies see e g solnik 1974a and grauer and hakansson 1987 have shown that investors should diversify internationally as by so doing they can reduce the risk of their portfolio without lowering the expected return this implies that if the citizens of a certain country are by legal restrictions prohibited from holding foreign securities they may require a higher rate of return on the domestic securities than the foreign investors do this may happen because the domestic investors cannot diversify away the specific country risk in the same way that the foreign investors can thus if we could observe the prices which the foreign and domestic investors are willing to pay for these domestic securities we would expect them to differ because of this diversification effect the finnish law prohibited finnish investors from investing in foreign securities until 1986 while simultaneously allowing foreign investors to own up to 20 of the shares of any finnish company moreover since 1984 the helsinki stock exchange hse has separately quoted the prices for the unrestricted shares which can be owned both by foreign and domestic investors and for the restricted shares owned solely by domestic investors thus the market setting depicted in the previous paragraph occurred perfectly in finland during the years 1984 and 1985 in this paper our objective is to develop and test an asset pricing model which takes into account the legal restrictions in the finnish stock market in section i we specify the market structure in the finnish stock market in more detail by explaining the relevant legal restrictions affecting the market we also present some descriptive statistics on the prices of the restricted and the unrestricted on

limiting losses may be injurious to your wealth abstract theory tells us that if return distributions are independent over time an expected utility maximizing logarithmic utility investor will almost surely accumulate the most long run wealth this paper examines the robustness of the result specifically it examines the expected and unexpected long run and short run consequences of imposing value at risk and other loss constraints on power utility investors with a numerical example and empirically in an asset allocation setting covering the 1934 2008 period in addition it examines the expected and unexpected long run consequences of imposing conditional value at risk constraints on power utility and prospect theory kinked linear utility investors

a rational explanation for home country bias abstract while modern portfolio theory predicts that investors should diversify across international markets corporate equity is essentially held by domestic investors french and poterba 1991 french k poterba j 1991 investor diversification and international equity markets american economic review 81 222 226 suggest that in order for this bias to be justified investors must hold optimistic expectations about their domestic markets and pessimistic expectations about their foreign markets tesar and werner 1995 tesar l l werner i m 1995 home bias and high turnover journal of international money and finance 14 467 492 find existing explanations for the home equity bias unsatisfactory and conclude that the issue poses a challenge for portfolio theory we develop a model that incorporates both the foregone gains from diversification and the informational constraints of international investing and shows that home equity bias is consistent with rational mean variance portfolio choice specifically we prove that the nature of estimation risk in international markets can be responsible for this phenomenon we show that when the cross market variability in the estimation errors of international markets means far exceeds the cross market variability in the means themselves domestic dedication dominates international diversification an examination of 11 international markets returns over the last 25 years from the perspective of german japanese and us investors provides evidence consistent with this explanation

risk reduction by diversification in the nordic stock markets empirical examination of the ex post potential gains of risk reduction through international portfolio diversification started with grubel 1968 levy and sarnat 1970 solnik 1974 and lessard 1974 in their survey of international finance adler and dumas 1983 p 938 summed up the results the potential for international diversification to reduce risk seems unquestionable in the wake of increasing liberalization for international portfolio investment more recent contributions include jorion 1985 1989 grauer and hakansson 1987 and levy and lerman 1988 the results of the pioneers have been corroborated by contemporary research and according to jorion 1989 p 54 international diversification extolled by grubel as early as 1968 seems to have delivered on its promises despite the long tradition of studies in international portfolio diversification there has been no such work regarding the nordic markets this paper fills the gap through an analysis of potential gains from international diversification for different nordic investors danish finnish norwegian and swedish if they invest in all the nordic equity markets until the beginning of the 1980s nordic investors particularly in finland and sweden faced legal restrictions on investment abroad see nordiska radet 1987 adler and dumas 1983 have pointed out that such restrictions would lead to partially or fully segmented markets and hietala 1989 has shown the existence of premiums in the finnish stock market in our study we do not make any direct test of whether the nordic equity markets have been segmented or integrated but our results might provide some indirect evidence the nordic countries are generally viewed as fairly homogeneous from a social political and economic point of view while international diversifi

international portfolio diversification with estimation risk international portfolio diversification has long been advocated as a way of enhancing average returns while reducing portfolio risk for the investor who considers diversifying into foreign securities this proposition however relies on the assumption that the required inputs to the classical mean variance analysis are known with certainty typically expected returns variances and covariances are simply replaced by their ex post sample values and the optimal portfolio is derived without mentioning the uncertainty inherent in these parameter values but the rational investor should take this uncertainty into account when forming expectations and probably will consider estimators that are less subject to estimation error than the classical sample mean this paper investigates alternative estimators of expected returns and their implications for the alleged gains from diversification an important observation is the crucial influence that errors in estimating expected returns have on portfolio analysis a closer examiprevious studies of international portfolio diversification have relied on ex post meanvariance analysis without considering the problem of estimation risk typically past averages are substituted for expected returns and no allowance is made for the uncertainty inherent in these parameter values first i demonstrate the shortcomings of such an approach and second i investigate another method of estimating expected returns initially proposed by stein by shrinking the sample averages toward a common mean i find that the out of sample performance of the optimal portfolio is substantially increased one of the implications of this method is that the classical conclusions vastly overestimate the possible gains in average returns instead benefits from diversification are more likely to accrue from a reduction in risk this paper draws on part of my dissertation at the university of chicago i am grateful to arnold zellner michael mussa george constantinides and especially john bilson for useful discussions and comments numerous improvements were also suggested by the referee this research received the generous financial support of the college interuniversitaire d etudes doctorales dans les sciences du management

are internal capital markets efficient using segment information from compustat we find that the investment by a segment of a diversified firm depends on the cash flow of the firm s other segments but significantly less than it depends on its own cash flow the investment by segments of highly diversified firms is less sensitive to their cash flow than the investment of comparable single segment firms the sensitivity of a segment s investment to the cash flow of other segments does not depend on whether its investment opportunities are better than those of the firm s other segments

back testing the performance of an actively managed option portfolio at the swedish stock market 1990 1999 we build an investment model based on stochastic programming in the model we buy at the ask price and sell at the bid price we apply the model to a case where we can invest in a swedish stock index call options on the index and the risk free asset by reoptimizing the portfolio on a daily basis over a ten year period it is shown that options can be used to create a portfolio that outperforms the index with ex post analysis it is furthermore shown that we can create a portfolio that dominates the index in terms of mean and variance i e at given level of risk we could have achieved a higher return using options

computing optimal multi currency mean variance portfolios abstract the paper provides an exact and computable solution to the general quadratic mean variance problem with exchange rate and return uncertainties multiple currencies are considered with multiple investments in each currency the classical mean variance formulation is augmented with currency risk the overall risk is hence the multiplicative effect of return risks within a currency and the currency risk currency risk may be interpreted in terms of though not restricted to past forecast errors we provide a framework within a general structure for return and exchange rate forecasts and risks we show that the quadratic mean variance structure is maintained and provide solutions to computational questions in the evaluation of the optimal portfolio by extending conventional analysis we arrive at a surprisingly simple solution which may be a useful addition to the arsenal of finance techniques

institutional interest ownership type and environmental capital expenditures evidence from the most polluting chinese listed firms this study empirically examines whether firms environmental capital expenditures impact institutional investors investment decisions in the chinese market we particularly examine the impact of ownership type on the relationship of environmental capital expenditures and the behavior of different types of institutional investors by classifying institutional investors into two categories short term and long term investors in addition this study further investigates whether environmental capital expenditures related to ownership type increase firm value we find that long term institutional investors tend to invest in state owned firms soes making environmental capital expenditures results also indicate that with governmental backing and encouragement the market value of soes making more environmental capital expenditures is likely to increase however no similar results are found for non soes

fiscal incentives and policy choices of local governments evidence from china abstract this paper examines how fiscal incentives affect the policy choices of local governments in the context of china based on exogenous changes in the intergovernmental revenue sharing scheme we construct a simulated instrumental variable to resolve the endogeneity problem we find evidence that local governments shifted their efforts from fostering industrial growth to urbanizing china i e to developing the real estate and construction sectors when their retention rate of enterprise tax revenue was reduced the increase from the new revenue source compensated for half of the losses in revenue that resulted from the reassignment of fiscal rights the reassignment had also the effect of retarding the industrial growth of domestically owned firms in particular

capital controls and international capital market segmentation the evidence from the japanese and american stock markets the paper focuses on two countries japan and the u s to test the integration of capital markets in japan the enactment of the foreign exchange and foreign trade control law in december of 1980 amounted to a true regime switch that virtually eliminated capital controls using multifactor asset pricing models we show that the price of risk in the u s and japanese stock markets was different before but not after the liberalization this evidence supports the view that governments are the source of international capital market segmentation the notion that world capital markets are perfectly integrated is central to most theoretical developments in both international finance and macroeconomics indeed it also lies behind much of the recent international policy discussion capital markets are integrated if assets with perfectly correlated rates of return have the same price regardless of the location in which they are traded 1 segmentation may arise either because of government impediments to capital movements or because of individuals attitudes or irrationality if the hypothesis that the international capital markets are integrated is rejected there is still an important empirical question left unanswered which is related to the source of segmentation while there is a rich body of theoretical research on international market integration only a few studies have tried to investigate this important question empirically a first group of empirical studies on market integration has generally adopted

security price reactions around corporate spin off announcements abstract we examine security price reactions around the announcements of 123 voluntary spin offs by 116 firms between 1963 and 1981 involving a pro rata distribution of the common stock of a subsidiary to the stockholders of the parent firm the median spin off in the sample is 6 6 of the original equity value and is associated with an abnormal return of 7 0 from 50 days prior to the announcement through completion of the spin off no evidence is found to indicate the gains to stockholders represent wealth transfers from senior securityholders over the entire event period we find positive gains for firms engaging in spin offs to facilitate mergers or to separate diverse operating units but negative returns to firms responding to legal and or regulatory difficulties in the two day interval surrounding the first press announcement we find positive average excess returns for all groups

a general equilibrium model of international portfolio choice we investigate in a two country general equilibrium model whether a bias in consumption towards domestic goods will necessarily lead to a preference for domestic securities we develop a model where investors are constrained to consume only from their domestic capital stock and where it is costly to transfer capital across countries in this model investors less risk averse than an investor with log utility bias their portfolios towards domestic assets investors more risk averse than log however prefer foreign assets thus this model suggests that it is unlikely that the portfolios observed empirically can be explained by the high proportion of domestic goods in total consumption we investigate in a two country general equilbrium model whether a bias in consumption toward domestic goods will necessarily lead to a preference for domestic assets in an investor s optimal portfolio we constrain investors to consume only from their domestic capital stock and introduce a proportional cost for transferring goods from one country this cost gives rise to endogenous deviations from the law of one price lop thus the home and foreign investors do not hold identical portfolios we show that an investor s optimal portfolio is biased towards domestic equity only if she is less risk averse than an investor with log utility investors with relative risk aversion greater than one exhibit a preference for the foreign asset this is because the exchange rate derived endogenously is negatively correlated with the return on the foreign asset and therefore the translated return on the foreign stock is less risky than that on the domestic stock thus the results of this model suggest that it is unlikely that the preference for domestic assets that is observed empirically can be explained by the high proportion of domestic goods in total consumption there exists a considerable body of literature documenting the gains from international diversification grubel 1968 was the first to propose that international diversification allows investors to attain lower return variances than those achievable by diversifying domestically this proposition relies on the correlation between stock indices across countries being significantly less

gains from international diversification 1968 85 returns on portfolios of stocks and bonds this paper applies the multi period investment model to a universe of international securities on the basis of the simple probability assessment approach our principal findings are 1 the gains from including non u s asset categories in the universe were remarkably large in some cases statistically significant especially for the highly risk averse strategies 2 the gains from removing the no leverage constraint were more substantial than they were in the absence of non u s securities and 3 there is strong evidence of market segmentation in that the optimal levels of investment in u s securities were mostly zero in the presence of the non u s asset categories

m form hierarchy with poorly diversified divisions a case of khrushchev s reform in soviet russia we test the premise of the theoretical literature that m form political hierarchies are effective in creating yardstick competition between regional divisions only when those divisions have sufficiently diversified or similar industrial composition the reason for this is that the competition among poorly diversified inter related divisions creates incentives for regional leaders to pursue policies that inhibit industrial growth in neighboring regions in order to make their own region look better from the point of view of the center we use a unique episode in soviet history when a traditional soviet unitary form u form hierarchy was replaced by a multidivisional form m form organization namely khrushchev s sovnarkhoz reform first we demonstrate that during this reform regional leaders were subjected to relative performance evaluation which created incentives to generate industrial growth second we show that these career concerns resulted in higher growth in regions with sufficiently diversified and therefore self contained economies and lower growth in highly specialized regions

how to reform a planned economy lessons from china the countries of eastern europe and the former soviet union have been flooded with advice from the west on how to liberalize their planned econo mies this advice is unfortunately offered in an empirical vacuum no one knows how these econo mies will react to the proposed liberalization meas ures there exists however a neglected source of information china offers a long time series of data over a decade s worth on the effects of reforms on a planned economy china s reforms were gradual but their cumulative effect has been large and they have been remarkably successful china s experiments provide some practical les sons on what kinds of reforms can work elsewhere the dominant school of thought among economists favours the big bang policy of reforming quickly and according to a comprehensive plan partial reforms in this view are useless they will be negated by the remnants of the planning system the proponents of big bang reform have been influential with poland czechoslovakia and rus sia announcing plans for a rapid transition to capi talism