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  • Articles  (17)
  • Articles: DFG German National Licenses  (17)
  • risk aversion  (17)
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  • Articles  (17)
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  • Articles: DFG German National Licenses  (17)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 13 (1991), S. 95-98 
    ISSN: 1436-6304
    Keywords: Extended incentive contracts ; project costs ; agency theory ; design functions ; target costs ; risk aversion ; Erweiterte Anreizverträge ; Projektkosten ; Prinzipal-Agent-Theorie ; Design-Funktionen ; Zielkosten ; Risikoaversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Einfache Anreizverträge zur Kostenreduktion sind durch drei Design-Parameter (Zielkosten, Zielprofit, Kostenteilungsparameter) gekennzeichnet. Bei erweiterten Anreizverträgen treten an die Stelle der Design-Parameter zwei Funktionen der vom Auftragnehmer selbst festzulegenden Zielkosten. Diese (vom Auftraggeber geeignet vorzugebenden) Funktionen reduzieren bei zu hohen Zielkosten automatisch den Zielprofit als auch etwaige durch Kostenunterschreitungen resultierende Zusatzgewinne. Hauptaugenmerk gilt einer Klasse von erweiterten Anreizverträgen, die bei risikoneutralen Auftragnehmern die wahrheitsgemäße Angabe der erwarteten Kosten erzwingt. Es wird gezeigt, daß es für risikoaverse Auftragnehmer generell im eigenen Interesse liegt, die Zielkosten höher als die erwarteten Kosten anzusetzen.
    Notes: Summary Extended incentive contracts allow the contractor to select target cost at his own discretion. Two suitably devised design functions ensure that the assessment of excessive target cost automatically reduces both target profit and possible gains from cost underruns. It is shown that extended incentive contracts stimulating risk neutral contractors to reveal their cost expectation truthfully induce risk averse contractors to assess the target cost far higher than expected cost.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    OR spectrum 16 (1994), S. 169-173 
    ISSN: 1436-6304
    Keywords: Capital asset pricing model ; risk aversion ; mean-variance aversion ; variance aversion ; Capital Asset Pricing Model ; Risikoaversion ; Mittelwert-Varianz-Aversion ; Varianzaversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Zwei Beweise der CAPM-Gleichung werden wiedergegeben und einander gegenübergestellt, wobei jeder eine andere Form von Risikoaversion voraussetzt. Der Beweis, der die schwächere Form von Risikoaversion benutzt, ist verwickelter, stellt aber die Gültigkeit der CAPM-Gleichung auf eine allgemeinere Grundlage. Die Beziehungen zwischen den verschiedenen Formen von Risikoaversion werden diskutiert.
    Notes: Abstract Two proofs of the CAPM equation each using a different form of risk aversion are recapitulated and confronted with each other. The proof using a weaker form of risk aversion is more involved but conveys greater generality to the validity of the CAPM equation. The relations existing between the various forms of risk aversion are discussed.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 30 (1991), S. 1-44 
    ISSN: 1572-9338
    Keywords: Stochastic optimization with recourse ; decision-making under uncertainty ; expected utility ; certainty equivalents ; the Allais paradox and other decision theoretic paradoxes ; risk aversion ; production under price uncertainty ; investment in risky and safe assets ; insurance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract We propose a new criterion fordecision-making under uncertainty. The criterion is based on acertainty equivalent (CE) of a (monetary valued) random variable Z, $$S_\upsilon (Z) = \mathop {\sup }\limits_z \{ z + E_Z \upsilon (Z - z)\} ,$$ wherev(·) is the decision maker'svalue-risk function. This CE is derived from considerations ofstochastic optimization with recourse, and is calledrecourse certainty equivalent (RCE). We study (i) the properties of the RCE, (ii) the recoverability ofv(·) fromS v (·) (in terms of the rate of change in risk), (iii) comparison with the “classical CE”u −1 Eu(·) inexpected utility (EU) theory, (iv) relation to risk-aversion, (v) connection with Machina'sgeneralized expected utility theory, and its use to explain theAllais paradox and other decision theoretic paradoxes, and (vi) applications to models ofproduction under price uncertainty, investment in risky and safe assets andinsurance. In these models the RCE gives intuitively appealing answers forall risk-averse decision makers, unlike the EU model which gives only partial answers, and requires, in addition to risk-aversion, also assumptions on the so-calledArrow-Pratt indices.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Annals of operations research 31 (1991), S. 479-499 
    ISSN: 1572-9338
    Keywords: Portfolio selection ; expected utility ; risk aversion ; recourse certainty equivalent ; duality in convex programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The portfolio selection problem with one safe andn risky assets is analyzed via a new decision theoretic criterion based on the Recourse Certainty Equivalent (RCE). Fundamental results in portfolio theory, previously studied under the Expected Utility criterion (EU), such as separation theorems, comparative static analysis, and threshold values for inclusion or exclusion of risky assets in the optimal portfolio, are obtained here. In contrast to the EU model, our results for the RCE maximizing investor do not impose restrictions on either the utility function or the underlying probability laws. We also derive a dual portfolio selection problem and provide it with a concrete economic interpretation.
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  • 5
    Electronic Resource
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    Springer
    Annals of operations research 52 (1994), S. 1-20 
    ISSN: 1572-9338
    Keywords: Choquet expected utility ; uncertainty aversion ; risk aversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The aim of this paper is to present in a unified framework a survey of some results related to Choquet Expected Utility (CEU) models, a promising class of models introduced separately by Quiggin [35], Yaari [48] and Schmeidler [40, 41] which allow to separate attitudes towards uncertainty (or risk) from attitudes towards wealth, while respecting the first order stochastic dominance axiom.
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  • 6
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    Springer
    Annals of operations research 45 (1993), S. 147-163 
    ISSN: 1572-9338
    Keywords: Portfolio theory ; risk aversion ; utility function ; diversification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In this paper, we first define risk in an axiomatic way and a class of utility functions suitable for the so-called mean-risk analysis. Then, we show that, in a portfolio selection problem with multiple risky investments, an investor who is more risk averse in the Arrow-Pratt sense prefers less risk, in the sense of this paper, with less mean return, and an investor who displays increasing (decreasing) relative risk aversion becomes more conservative (aggressive) as the initial capital increases. The risk aversion effect for diversification on optimal portfolios is also discussed.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 9 (1994), S. 257-272 
    ISSN: 1573-0476
    Keywords: expected utility ; nonexpected utility ; risk aversion ; comparative statics ; multivariate risk ; D81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract This article investigates the preservation of multivariate expected utility comparative statics for “smooth” nonexpected utility representations. Specifically, we answer the following question: if an expected utility comparative statics property depends only on preferences over sure prospects, then when will a nonexpected utility maximizer with identical sure preferences also satisfy that property? We demonstrate that the effects of increased risk aversion are preserved under the “Almost Degenerate Independence” axiom, but that those of distribution changes of exogenous risks are not preserved under stringent assumptions. Hence, nonexpected utility comparative statics may diverge from expected utility, even for “first-order” properties—those whose effect is determinable from restrictions on “local” utility functions.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 7 (1993), S. 147-175 
    ISSN: 1573-0476
    Keywords: prospect theory ; rank-dependence ; sign-dependence ; comonotonicity ; risk aversion ; diminishing marginal utility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract This paper presents a method for axiomatizing a variety of models for decision making under uncertainty, including Expected Utility and Cumulative Prospect Theory. This method identifies, for each model, the situations that permit consistent inferences about the ordering of value differences. Examples of rankdependent and sign-dependent preference patterns are used to motivate the models and the “tradeoff consistency” axioms that characterize them. The major properties of the value function in Cumulative Prospect Theory—diminishing sensitivity and loss aversion—are contrasted with the principle of diminishing marginal utility that is commonly assumed in Expected Utility.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 3 (1990), S. 135-154 
    ISSN: 1573-0476
    Keywords: bargaining ; risk aversion ; nonunanimity voting rules ; alternating offer model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract The role of risk preferences in determining the outcome to bargaining is examined for the case in which acceptance of a proposal requires less than unanimous approval. Using an n-agent extension of the Ståhl-Rubinstein alternating offer model, we find that risk preferences play a fundamentally different role when bargaining is settled using a nonunanimity voting rule. Risk preferences determine not only an agent's reservation price but also the likelihood that he is made part of the winning coalition. An implication of this analysis is that when the preferences of the agents are not too diverse, it is advantageous for an agent to be relatively risk-averse.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 4 (1991), S. 271-283 
    ISSN: 1573-0476
    Keywords: risk aversion ; expected and nonexpected utility ; measure of risk aversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract In the expected utility case, the risk-aversion measure is given by the Arrow-Pratt index. Three proposals of a risk-aversion measure for the nonexpected utility case are examined. The first one sets “the second derivative of the acceptance frontier as a measure of local risk aversion.” The second one takes into account the concavity in the consequences of the partial derivatives of the preference function with respect to probabilities. The third one measures risk aversion through the ratio between the risk premium and the standard deviation of the lottery. The third proposal catches the main feature of risk aversion, while the other two proposals are not always in accordance with the same crude definition of risk aversion, by which there is risk aversion when an agent prefers to get the expected value of a lottery rather than to participate in it.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 3 (1990), S. 105-113 
    ISSN: 1573-0476
    Keywords: Partial-risk aversion ; preference reversals ; portfolio analysis ; risk aversion ; comparative statics ; heteroskedastic risks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract One rational individual may be willing to pay less than another to insure a risk % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWefv3ySLgznf% gDOfdaryqr1ngBPrginfgDObYtUvgaiuaacuWF1oG8gaacaaaa!41B4!\[\tilde \varepsilon \] when another risk % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabm4Dayaaia% aaaa!36F7!\[\tilde w\] is present even though he would pay more to insure any isolated risk, and even though % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyraiGacI% cadaabcaqaamrr1ngBPrwtHrhAXaqeguuDJXwAKbstHrhAG8KBLbac% faGaf8xTdiVbaGaaaiaawIa7aiqadEhagaacaiGacMcaciGG9aGaai% imaaaa!47F3!\[E(\left. {\tilde \varepsilon } \right|\tilde w) = 0\] for all w. Noticing this, Ross (1981) proposed excluding such reversals and gave equivalent analytical conditions. Reconsidering, we explain why some reversals are natural and show that prohibiting them has peculiar and undesirable properties. Although we also simplify the conditions and prove them necessary for partial-risk portfolio results, we conclude that they represent revealing restrictions on comparative statics rather than natural implications of increased aversion to risk.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 4 (1991), S. 329-338 
    ISSN: 1573-0476
    Keywords: gambling ; insurance ; risk ; risk aversion ; probability shifting ; utility theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract Will a more risk-averse individual spend more or less to improve probabilities, say on marketing efforts that enhance the chance of a sale? For any two payoffs and starting probabilities, the answer is unfortunately indeterminate. However, interpreting gambling as increasing small chances of good outcomes and insurance as reducing small chances of bad outcomes, the more risk-averse individual will pay less (more) to gamble (insure). We find a critical switching probability that depends on the individuals and outcomes involved. If the good outcome is less (more) likely than this critical value, the expenditures represent gambling (insurance).
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of risk and uncertainty 9 (1994), S. 77-91 
    ISSN: 1573-0476
    Keywords: non-expected utility ; risk aversion ; marginal utility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract The present work takes place in the framework of a non-expected utility model under risk: the RDEU theory (Rank Dependent Expected Utility, first initiated by Quiggin under the denomination of Anticipated Utility), where the decision maker's behavior is characterized by two functionsu andf. Our first result gives a condition under which the functionu characterizes the decision maker's attitude towards wealth. Then, defining a decision maker as risk averter (respectively risk seeker) when he always prefers to any random variable its expected value (weak definition of risk aversion), the second result states that a decision maker who has an increasing marginal utility of wealth (a convex functionu) can be risk averse, if his functionf is“sufficiently below” his functionu, hence if he is sufficiently“pessimistic.” Obviously, he can also be risk seeking with a diminishing marginal utility of wealth. This result is noteworthy because with a stronger definition of risk aversion/risk seeking, based on mean-preserving spreads, Chew, Karni, and Safra have shown that the only way to be risk averse (in their sense) in RDEU theory is to have, simultaneously, a concave functionu and a convex functionf.
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    The journal of real estate finance and economics 8 (1994), S. 259-266 
    ISSN: 1573-045X
    Keywords: auction sequence ; risk aversion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract A sequential auction of commercial properties produced evidence that bid timing matters. Prices declined as the auction proceeded, an outcome consistent with expectations when bidders are either risk averse or quantity constrained.
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  • 15
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    Springer
    Theory and decision 29 (1990), S. 53-68 
    ISSN: 1573-7187
    Keywords: risk aversion ; risk premium ; mean preserving spreads ; expected and non-expected utility models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract Two definitions of risk aversion have recently been proposed for non-expected utility theories of choice under uncertainty: the former refers the measure of risk aversion (Montesano 1985, 1986 and 1988) directly to the risk premium (i.e. to the difference between the expected value of the action under consideration and its certainty equivalent); the latter defines risk aversion as a decreasing preference for an increasing risk (introduced as mean preserving spreads) (Chew, Karni and Safra 1987, Machina 1987, Röell 1987, Yaari 1987). When the von Neumann-Morgenstern utility function exists both these definitions indicate an agent as a risk averter if his or her utility function is concave. Consequently, the two definitions are equivalent. However, they are no longer equivalent when the von Neumann-Morgenstern utility function does not exist and a non-expected utility theory is assumed. Examples can be given which show how the risk aversion of the one definition can coexist with the risk attraction of the other. Indeed the two definitions consider two different questions: the risk premium definition specifically concerns risk aversion, while the mean preserving spreads definition concerns the increasing (with risk) risk aversion. The mean preserving spreads definition of risk aversion, i.e. the increasing (with risk) risk aversion, requires a special kind of concavity for the preference function (that the derivatives with respect to probabilities are concave in the respective consequences). The risk premium definition of local risk aversion requires that the probability distribution dominates on the average the distribution of the derivatives of the preference function with respect to consequences. Besides, when the local measure of the first order is zero, there is risk aversion according to the measure of the second order if the preference function is concave with respect to consequences. Yaari's (1969) measure of risk aversion is closely linked to the r.p. measure of the second order. Its sign does not indicate risk aversion (if positive) or attraction (if negative) when the measure of the first order is not zero (i.e., in Yaari's language, when subjective odds differ from the market odds).
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  • 16
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    Springer
    Theory and decision 35 (1993), S. 75-106 
    ISSN: 1573-7187
    Keywords: Expected utility ; risk aversion ; Allais paradox ; fanning-out
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract In two experiments we test Machina's Hypothesis II (fanning-out). In each experiment we analyze patterns of responses to hypothetical lottery choice questions within a Marschak-Machina triangle. One set of questions involves lotteries on the border of the triangle, an the other set of questions involves lotteries in the interior of the triangle (off the border). Our results show that a large proportion of the observed patterns in the on-border treatment support Hypothesis II, with a considerable amount of fanning-out behavior observed. The patterns observed in the off-border treatment are significantly different from those in the on-border treatment. Hypothesis II performs well in the off-border treatment because expected utility theory itself, which satisfies the restrictions of Hypothesis II, performs well.
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  • 17
    Electronic Resource
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    Springer
    Theory and decision 36 (1994), S. 1-44 
    ISSN: 1573-7187
    Keywords: Rank-dependent utility ; risk aversion ; diminishing marginal utility ; strength of preference ; orderings of tradeoffs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract This paper is motivated by the search for one cardinal utility for decisions under risk, welfare evaluations, and other contexts. This cardinal utility should have meaningprior to risk, with risk depending on cardinal utility, not the other way around. The rank-dependent utility model can reconcile such a view on utility with the position that risk attitude consists of more than marginal utility, by providing a separate risk component: a ‘probabilistic risk attitude’ towards probability mixtures of lotteries, modeled through a transformation for cumulative probabilities. While this separation of risk attitude into two independent components is the characteristic feature of rank-dependent utility, it had not yet been axiomatized. Doing that is the purpose of this paper. Therefore, in the second part, the paper extends Yaari's axiomatization to nonlinear utility, and provides separate axiomatizations for increasing/decreasing marginal utility and for optimistic/pessimistic probability transformations. This is generalized to interpersonal comparability. It is also shown that two elementary and often-discussed properties — quasi-convexity (‘aversion’) of preferences with respect to probability mixtures, and convexity (‘pessimism’) of the probability transformation — are equivalent.
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