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4. Suppose investments X and Y have normal distributions N(M\,
7. Consider an investor having the quadratic utility function of Exercise 6. We are interested in preference criteria for the dominance of Xi over X2 when the only information known is that (i) 0 g Xi, X2 g k; (ii) the means and variances Hi,n2 and aua2 are known with Afi = M2—ft £ 0; and (iii) Xt and X2 have symmetric distributions. Let i?, and R2 be the length of the ranges of Xi,X2, i.e., Rt = inf [b-a\P(Xt >b) = P(X, < a) = 0], i = 1,2. (a) Show that Rt^2(k-Vi)- (b) Show that i?,S 2CT,. Let A = max{/ii + ai, #2+a2}. (c) Show that Xi is preferred to X2 if 2 A//L4 - p) - ACT 2 > 0. (d) Given symmetric returns Xi, X2, X3 as above, choose A = max{î + EX2 and 3(EXi 2 -EX2 2 ) 2 < 4(EXi-EX2)(EXi 3 -EX2 3 ). (b) Show that the condition in (a) is transitive, that is, if Xt is preferred to X2 and X2 is preferred to X3, then Xi is also preferred to X3. 9. The Tobin separation theorem gives sufficient conditions for the optimal proportions held in the risky assets to be independent of the investor's utility function and the proportion of the investor's initial wealth that is invested in the risk-free asset. The theorem is proved and discussed in Lintner's paper in a mean variance analysis setting. It is of interest to develop similar separation theorems for wider classes of risk measures. Suppose initial wealth is one dollar and that x = (x2, ...,*„) are the investments made in the risky investments i = 2,..., n which have the known joint cumulative distribution function F(p2, ...,p„). Let — x0 be the level of borrowing in a risk free asset at rate p0, and Xi be the level of lending in a risk free asset at rate pi. The return is then £"= o Pi *i • Consider a risk measure R(x) and suppose the R is homogeneous of degree m, differentiable, and concave on the convex set K which represents constraints on the choice of x save the budget constraint. Assume that {(x0, ...,x„)\xe K, x0 £ 0, Xi g 0, ^,1=0xi = 1} is compact. (a) Suppose pa — Pi and that K = {x \ x S 0}. Show that the ratios of the optimal investments in x2,...,x„ are independent of the optimal investment in the risk free asset as long as this investment (x0 + Xi) is nonzero. {Hint: Develop the Kuhn-Tucker conditions for minR(x) \ J^PiX, got, £ x, = 1, x, SO, i'= \,...,n, XoSO 1 = 0 1 = 0 J and show that if x* satisfies them, then so does (/?i*o, /?i*i, Pix2,...,p2x^ for all pi >0,p2> 0.] (b) Show that the separation property holds if only lending is allowed and jt, > 0. (c) Show that the separation property holds if only borrowing is allowed and x0 < 0. Suppose p0 > pi and that K = {x | x g 0}. (d) Show that it is never optimal to borrow at p0 and lend at pi. (e) Show that the separation property holds unless x0 = Xi = 0. COMPUTATIONAL AND REVIEW EXERCISES 173
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STOCHASTIC OPTIMIZATION MODELS IN F
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STOCHASTIC OPTIMIZATION MODELS IN F
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Dedicated to the memory of my fathe
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PART II. QUALITATIVE ECONOMIC RESUL
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2. Risk Aversion over Time Implies
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PREFACE AND BRIEF NOTES TO THE 2006
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and shows that current research in
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1990. This area presages the CVaR l
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transaction cost band. Most such mo
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through targets and are less sensit
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ing dates, the papers by Breiman, H
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Carino, D. and W.T. Ziemba (1998).
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Kallberg, J.G. and W.T. Ziemba (198
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Stone, D. and W.T. Ziemba (1993). L
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PREFACE IN 1975 EDITION There is no
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particular results are generally st
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Part I Mathematical Tools
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wealth, then his utility function m
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cases in Exercise CR-12. The relati
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However, some extensions to infinit
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1. EXPECTED UTILITY THEORY The Anna
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SUBJECTIVE PROBABILITIES ANT EXPECT
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SUBJECTIVE PROBABILITIES AND EXPECT
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282 O. L. MANGA3ARIAN" for every X
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284 O. L. MANGASARIAN We have from
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280 O. L. MANQASARIAN For the case
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288 O. L. MANGASAMAN Proof. Conside
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290 O. L. MANGASARIAN Second Berkel
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denotes the /w-dimensional vector o
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Proof (I) We shall prove this part
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(Ill) have not, to the author's kno
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for the case (3); and for the case
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3. DYNAMIC PROGRAMMING Introduction
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INTRODUCTION TO DYNAMIC PROGRAMMING
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COMPUTATIONAL AND REVIEW EXERCISES
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(d) xxx2 on E+ 2 = {x\xt = 0, x2 S
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Show that the Kuhn-Tucker condition
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(a) Show that/, (b, c) = gt (Z>, c)
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(c) Show that the monotonicity assu
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An individual's preferences are sai
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12. (Hessians, bordered Hessians, c
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The problem in (b)-(c) hints that t
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(1) Suppose/is twice continuously d
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(f) Assume that R(i,a) g 0 and the
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(j) Show that an optimal policy Va
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INTRODUCTION In the second part of
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andom variables when the utility fu
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detailed analysis of the qualitativ
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separation in a local sense (for al
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1. STOCHASTIC DOMINANCE G. Hanoch a
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But now, EFFICIENCY ANALYSIS OF CHO
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EFFICIENCY ANALYSIS OF CHOICES INVO
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A Unified Approach to Stochastic Do
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A UNIFIED APPROACH TO STOCHASTIC DO
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RISK AVERSION 123 a given risk the
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RISK AVERSION 125 If z is actuarial
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RISK AVERSION 127 4. CONCAVITY The
Page 158 and 159: To show that (a) implies (d), note
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Page 162 and 163: 9.2. Example 2. If (30) u'(x)=(x°
Page 164 and 165: RISK AVERSION 135 12. INCREASING AN
Page 166 and 167: ADDENDUM In retrospect, 1 wish foot
Page 168 and 169: 14 THE REVIEW OF ECONOMICS AND STAT
Page 193 and 194: Separation in Portfolio Analysis R.
Page 195 and 196: SEPARATION IN PORTFOLIO ANALYSIS an
Page 197 and 198: SEPARATION IN PORTFOLIO ANALYSIS II
Page 199 and 200: SEPARATION IN PORTFOLIO ANALYSIS Th
Page 201 and 202: SEPARATION IN PORTFOLIO ANALYSIS Ca
Page 203 and 204: SEPARATION IN PORTFOLIO ANALYSIS It
Page 205 and 206: SEPARATION IN PORTFOLIO ANALYSIS th
Page 207: COMPUTATIONAL AND REVIEW EXERCISES
Page 211 and 212: Then eliminate p from (2) to obtain
Page 213 and 214: (a) Show that an indifference curve
Page 215 and 216: (d) Develop a similar result to (c)
Page 217: Exercise Source Notes Exercise 1 wa
Page 220 and 221: (f) Show that k > 0. [Note (Exercis
Page 222 and 223: (c) Interpret (b). (d) Illustrate s
Page 224 and 225: 9. Let the partial relative risk-av
Page 226 and 227: Condition (iv) is called the "no-ea
Page 228 and 229: Then * ( 8xj \ V - s u = \-r-\ -ax,
Page 230 and 231: exhibiting decreasing absolute and
Page 232 and 233: (a) Determine necessary and suffici
Page 234 and 235: Let the random variables Og^Sl and
Page 237: Part III Static Portfolio Selection
Page 240 and 241: given parameter. Exercise ME-30 dev
Page 242 and 243: utility function. However, many con
Page 244 and 245: the characteristic exponent is 2 (i
Page 246 and 247: proportions to maximize expected ut
Page 248 and 249: investment returns are always nonne
Page 250 and 251: case to a case of one riskless and
Page 252 and 253: 538 REVIEW OF ECONOMIC STUDIES Howe
Page 254 and 255: 540 REVIEW OF ECONOMIC STUDIES wher
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JAMES A. OHLSON that quadratic util
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JAMES A. OHLSON Assumptions A1-A3 a
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JAMES A. OHLSON (i) snpl/ieSi\U (3)
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JAMES A. OHLSON A number of interes
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JAMES A. OHLSON for all y,teSx'3C{Q
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Since Z"=o^( w »0 = 0 and/(«,«)
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JAMES A. OHLSON analysis here is "o
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76 THE REVIEW OF ECONOMICS AND STAT
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Choosing Investment Portfolios When
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CHOOSING INVESTMENT PORTFOLIOS univ
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CHOOSING INVESTMENT PORTFOLIOS The/
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CHOOSING INVESTMENT PORTFOLIOS Tobi
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CHOOSING INVESTMENT PORTFOLIOS a-di
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CHOOSING INVESTMENT PORTFOLIOS Henc
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CHOOSING INVESTMENT PORTFOLIOS Lemm
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CHOOSING INVESTMENT PORTFOLIOS ID.
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CHOOSING INVESTMENT PORTFOLIOS Proo
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CHOOSING INVESTMENT PORTFOLIOS is c
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CHOOSING INVESTMENT PORTFOLIOS Proo
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CHOOSING INVESTMENT PORTFOLIOS 3. C
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2. EXISTENCE AND DIVERSIFICATION OF
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ON THE EXISTENCE OF OPTIMAL POLICIE
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Reprinted from Journal of Financial
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Remarks: Differentiability assumpti
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distributed from the rest. Then an
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x * "22 "12 1 " (o22- a12) + (0n -
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to decline — as if having more mo
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solved for as a function 8.(y,0"),
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FOOTNOTES 1. H. Makower and J. Mars
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264 QUARTERLY JOURNAL OF ECONOMICS
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274 QUARTERLY JOURNAL OP ECONOMICS
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280 QVABTBRLY JOURNAL OF ECONOMICS
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Reprinted from THE REVIEW OF ECONOM
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(1.1) and (1.2) give SOME EFFECTS O
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SOME EFFECTS OF TAXES ON RISK-TAKIN
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REFERENCES SOME EFFECTS OF TAXES ON
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COMPUTATIONAL AND REVIEW EXERCISES
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and a gamble is offered that return
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among two risky assets and a riskle
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Consider problem (1) and suppose th
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21. Let pi,...,p„ be joint-normal
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Consider the following four utility
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4. In most stochastic optimizing mo
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(g) Discuss the use of semivariance
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(a) Suppose that the investor alloc
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The linear programming subproblems
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(f) Show that (j> is proportional t
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(e) Show that X has mean and varian
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(i) Show that for all Aru ...,km, t
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Some properties of the expected val
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(i) Suppose that V0 is positive def
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where V is the gradient operator an
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and where Z, Ylt...,Ym are independ
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INTRODUCTION This part of the book
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some qualitative characteristics of
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function of wealth. Hence the optim
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INVESTMENT ANALYSIS UNDER UNCERTAIN
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P if and only if INVESTMENT ANALYSI
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INVESTMENT ANALYSIS UNDEB UNCERTAIN
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2. RISK AVERSION OVER TIME IMPLIES
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ables at t, and the primed variable
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ehavior in choosing among timeless
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is to asume that the consumer behav
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The function t/,(C,_,, wt|a,, ft) i
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sumption, given state j3,+i at r+l,
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3. MYOPIC PORTFOLIO POLICIES Reprin
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326 THE JOURNAL OF BUSINESS this op
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328 THE JOURNAL OF BUSINESS with th
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330 THE JOURNAL OF BUSINESS In sum
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332 THE JOURNAL OF BUSINESS subject
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334 THE JOURNAL OF BUSINESS myopic
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where and k" 1 f (Mt-Ui) 2 4k {Oi 1
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MIND-EXPANDING EXERCISES 1. Conside
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(i.e., partial separability) and #,
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(c) Discuss the solution properties
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(d) By differentiating (cl) and (c2
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Let U be the utility function for t
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INTRODUCTION I. Two-Period Consumpt
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asked to develop explicit solutions
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that the property of nonincreasing
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The Hakansson paper studies a gener
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In the Samuelson-Hakansson additive
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techniques. The article by Breiman
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enously). These requirements are to
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in general, a monotonic function of
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ergodic theory, the book by Breiman
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or less than u; either do nothing o
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ME-24 the reader is invited to cons
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In discrete time, a nonnegative lin
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R. G. VICKSON This must not be inte
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This gives with R. G. VICKSON t(t)
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TWO-PERIOD CONSUMPTION MODELS AND P
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310 DRfeZE AND MODIGLIANI second or
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312 DREZE AND MODIGLIANI Had the sa
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314 DRfezE AND MODIGLIANI (— UÛ^
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316 DREZE AND MODIGLIANI ure for te
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318 DREZE AND MODIGLIANI income sid
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320 DREZE AND MODIGLIANI (3.5) The
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322 DREZE AND MODIGLIANI Consumptio
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324 DREZE AND MODIGLIANI in (cj, c2
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326 DREZE AND MODIGLIANI Since dÛj
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328 DREZE AND MODIGLIANI On the rig
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330 DRfeZE AND MODIGLIANI and its p
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332 DREZE AND M0DIGLIAN1 LEMMA C.2.
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334 DRfeZE AND MOD1GLIANI if the sm
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MANAGEMENT SCIENCE Vol. 19, No. 2,
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A DYNAMIC MODEL FOR BOND PORTFOLIO
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Maximize A DYNAMIC MODEL FOE BOND P
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MULTIPERIOD RISK PREFERENCE 41 mode
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MULTIPERIOD RISK PREFERENCE 43 The
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MULT1PERI0D RISK PREFERENCE between
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MULTIPERIOD RISK PREFERENCE 47 (ii)
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MULTIPERIOD RISK PREFERENCE 49 that
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or if s"(s' MULTIPERIOD RISK PREFER
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MULTIPERIOD RISK PREFERENCE 53 5. C
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Reprinted from The Review of Econom
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the risky asset, with 1 — w, goin
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w*t = glW,;Z,-1,...,Z0] = gT_i[W>]
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Since proof of the theorem is strai
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E C O N O M E T R I C A VOLUME 38 S
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OPTIMAL INVESTMENT 589 M: the numbe
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OPTIMAL INVESTMENT 591 For comparis
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(ii) in the case of Model III, 1 1
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Let Then OPTIMAL INVESTMENT 595 *.=
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where OPTIMAL INVESTMENT 597 (41) T
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where (54) T(x) = sup \ log c + log
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where b(v*) is the greatest lower b
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OPTIMAL INVESTMENT 603 noncapital i
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OPTIMAL INVESTMENT 605 Let us now t
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OPTIMAL INVESTMENT 607 REFERENCES [
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present value. Let ( be time, r the
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constant or decrease at a constant
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Denote the vector in the parenthese
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112 HOWARD M. TAYLOB easy to pictur
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114 HOWARD M. TAYLOR market and ign
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116 HOWARD M. TAYLOR the investor w
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118 HOWARD M. TAYLOR option which a
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120 HOWARD M. TAYLOR 3. BR.VDA, J.
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172 BASIL A. KALYMON more general p
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174 BASIL A. KALYMON The three case
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176 BASIL A. KALYMON an additional
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178 BASIL A. KALYMON (24) d\ = r -
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180 BASIL A. KALYMON The above resu
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182 BASIL A. KALYMON PROOF. First w
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MANAGEMENT SCIENCE Vol. 17, No. 7,
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M1NIMAX POLICIES FOB SELLING AN ASS
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MINIMAX POLICIES FOB SELLING AN ASS
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MINIMAX POLICIES FOR SELLING AN ASS
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MINIMAX POLICIES TOR SELLING AN ASS
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MINIMAX POLICIES FOB SELLING AN ASS
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648 L. BREIMAN We have discussed th
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650 L. BREIMAN Hence, it is suffici
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(a.s.) on the set lim XN < oo > u <
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EDWARD O. THORP method to this arti
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EDWARD O. THORP drastic simplificat
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EDWARD O. THORP us is that the prop
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EDWARD O. THORP Let the range of Rj
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EDWARD O. THORP is approximately on
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EDWARD O. THORP choosing P in repea
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EDWARD O. THORP return from the hed
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EDWARD O. THORP it is plausible to
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EDWARD O. THORP is maximization of
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EDWARD O. THORP 6. BREIMAN, L., "Op
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Reprinted from JOURNAL OF ECONOMIC
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CONSUMPTION AND PORTFOLIO RULES 375
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and CONSUMPTION AND PORTFOLIO RULES
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CONSUMPTION AND PORTFOLIO RULES giv
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Yin CONSUMPTION AND PORTFOLIO RULES
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Y(t) Y CONSUMPTION AND PORTFOLIO RU
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(d) Suppose n > r2. Formulate the o
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(j) Show that the absolute risk-ave
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The optimal first-period decision a
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(b) Show that the optimal policy in
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the game is stationary and favorabl
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(v) UHEV-E^CV-Af- 1 )^ w, V&0, w>0,
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MIND-EXPANDING EXERCISES 1. Conside
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Note the following distinction betw
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(e) Discuss the computational aspec
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(a) Show that U obeys the functiona
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(g) If ;ij(0) > 0 (1 g; g N), show
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Note that problem P2 has 3(N- 1)+1
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Note that (f) and (g) imply the exi
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P = (Pu), where pu = P[X„+l =j\ X
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(a) Show that {X„} is a stationar
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(b) Show that T T u = a + b Y[ c\'
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(b) Interpret this assumption. Is i
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(d) Show that (c) may be written as
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Bibliography Journal Abbreviations
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BHARUCHA-REID, A. T. (1960). Elemen
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FIACCO, A. V., and MCCORMICK, G. P.
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IGLEHART, D. (1965). "Capital accum
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MANGASARIAN, O. L. (1966). "Suffici
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PORTEUS, E. L. (1972). "Equivalent
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THOMASION, A. J. (1969). The Struct
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A Absolute risk aversion, 84, 85, 9
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Logarithmic utility functions, see
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V Value of information, 462-467, 68
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