a rank dependent utility model of uncertain lifetime abstract in a continuous time life cycle model of consumption with an uncertain lifetime we use a non parametric specification of rank dependent utility theory to characterize the preferences of the agent we prove that time consistency holds for a subclass of probability weighting function providing the foundation for a constant rate of time preference that interacts multiplicatively with the hazard rate instead of additively as in the yaari 1965 seminal model we calibrate both models to explain the hump in the life cycle consumption and show that the multiplicative model is more robust

imperfect information and strikes an analysis of canadian experience 1967 82 to test their hypothesis that the propensity to strike is affected less by the actual balance of bargaining power than by the parties uncertainty about their relative power the authors perform a probit analysis of data on 1 871 collective agreements negotiated in the canadian manufacturing sector between 1967 and 1982 they find consistent with their hypothesis that some characteristics of individual bargaining units the relevant industries and the economy as a whole that affect both the quantity and reliability of information needed to assess relative bargaining power do have significant value in predicting strike incidence across industries and over time

life cycle consumption and hyperbolic discount functions abstract studies of animal and human behavior suggest that discount functions are approximately hyperbolic ainslie picoeconomics 1992 hyperbolic models explain a wide range of empirical anomalies including 1 missing precautionary savings effects 2 incongruence between the elasticity of intertemporal substitution and the inverse of the coefficient of relative risk aversion 3 consumption discontinuities at retirement 4 variation in patience over the life cycle 5 consumer self reports of undersaving 6 disproportionate retirement accumulation in illiquid assets 7 asset specific marginal propensities to consume and 8 declining national savings rates in developed countries hyperbolic models also provide a new framework for analyzing the welfare gains that come from pro saving policies like social security and tax deferred retirement accounts

unions and strikes with asymmetric information strikes seem to be a pareto inefficient outcome of bargaining between a union and a firm however this paper shows that strikes can be the outcome of rational behavior by both agents if the firm has more information than the union concerning the state of nature the union can use strikes as a way of gaining information the paper uses an asymmetric information model where the firm has information about the state i e profitability that the union does not know the schedule of wage offers by the union then depends on the probability that a given state will occur

cyclical fluctuations in strike activity using a set of data on contracts and strikes for the period 1970 81 the author distinguishes among the roles of aggregate business conditions labor market conditions and product market conditions in the determination of strike incidence and duration strike incidence is found to be highest in industries that are depressed relative to the rest of the economy but in regions with low unemployment this finding is consistent with the theory that the cost of a strike to a firm increases with the demand for its product and the cost of a strike to the union increases with unemployment another finding however is that strikes are longest in industries that are booming relative to the rest of the economy

the hyperbolic consumption model calibration simulation and empirical evaluation ur preferences for the long run tend to conflict with our short run behavior when planning for the long run we intend to meet our deadlines exercise regularly and eat healthfully but in the short run we have little interest in revising manuscripts jogging on the stairmaster and skipping the chocolate souffleala mode delay of gratification is a nice long term goal but instant gratification is disconcertingly tempting this gap between long run intentions and short run actions is apparent across a wide range of behaviors including saving choices a 1997 survey found that 76 percent of respondents believe they should be saving more for retirement looking only at respondents who believed they were at an age where you should be seriously saving already the survey found that 55 percent reported being behind in their savings and only 6 percent reported being ahead farkas and johnson 1997 the report on the survey concluded t he gaps between people s atti tudes intentions and behavior are troubling and threaten increased insecurity and dissatisfaction for people when they retire americans are simply not doing what logic and their own reasoning suggests they should be doing a 1993 luntz webber merrill lynch survey found similar answers when baby boomers were asked what percentage of your annual household income do you think you should save for retirement and what percentage of your annual

market structure and the pricing of electricity and natural gas us electricity and natural gas markets have traditionally been serviced by one of two market structures in some markets electricity and natural gas are sold by a regulated dual product monopolist while in other markets electricity and natural gas are sold by separate regulated single product monopolies i analyze whether electricity and natural gas prices depend on the market structure and compare these results to the predictions of a number of theories the results are most consistent with the political economy theories suggesting that regulators respond to interest group activity

time tradeoff sequences for analyzing discounting and time inconsistency this paper introduces time tradeoff tto sequences as a general tool to analyze intertemporal choice we give several applications for empirical purposes we can measure discount functions without requiring any measurement of or assumption about utility we can quantitatively measure time inconsistencies and simplify their qualitative tests tto sequences can be administered and analyzed very easily using only pencil and paper for theoretical purposes we use tto sequences to axiomatize quasi hyperbolic discount functions we demonstrate the feasibility of measuring tto sequences in an experiment in which we tested the axiomatizations our findings suggest rejections of several currently popular discount functions and call for the development of new ones it is especially desirable that such discount functions can accommodate increasing impatience

survival ambiguity and welfare abstract nearly all life cycle models adopt yaari s 1965 assumption that individuals know the survival probabilities that they face given that an individual s exact survival probabilities are likely unknown we explore the implications of relaxing this assumption if there is no annuity market then the welfare cost of survival ambiguity is large and regressive ambiguity neutral individuals would pay as much as 1 of total lifetime consumption for immediate resolution of ambiguity and the bottom income quintile is 4 times worse off than the top quintile alternatively with the availability of competitive annuity contracts survival ambiguity is welfare improving because it allows competitive insurance companies to pool risk across survival types even though social security and annuities share some properties social security does not help to hedge survival ambiguity

on the public economics of annuities with differential mortality this paper studies the problem of redistribution between individuals having different mortality rates we use a continuous time model in which there are two types of individuals characterized by different survival probability paths individual preferences are represented by a generalized life cycle utility function which can exhibit temporal risk aversion we successively compare utilitarian allocations when individuals exhibit temporal risk neutrality and temporal risk aversion this problem is analyzed successively in the context of full information and asymmetric information on mortality rates

an empirical study of the adverse selection model of strikes problems with existing empirical studies of the asymmetric information theory of strikes are 1 industry level data are used as proxies for firm level variables 2 studies using firm level data potentially suffer from simultaneity bias and 3 one of the key predictions of the theory is not tested the present paper addresses these issues while estimating a probit model of strike incidence using data comprising 2 459 contracts from canadian industry for 1964 85 that are merged with firm specific data under a number of alternative specifications results support the main predictions of the asymmetric information theory of strikes

uncertain lifetime and intertemporal choice risk aversion as a rationale for time discounting this article makes explicit the links between preferences over lotteries on length of life and intertemporal choice it shows that the approach used by traditional life cycle models to account for uncertain survival corresponds to a strong assumption of risk neutrality with respect to length of life relaxing such an assumption leads us to develop a more general formulation of lifetime utility in which time discounting is directly related to preferences over length of life exponential and hyperbolic discounting are found to result in a first approximation from constant and hyperbolic risk aversion with respect to length of life

negligible senescence an economic life cycle model for the future abstract we propose a model of aging and health deficit accumulation model with an infinite time horizon and a steady state of constant health the time of death is uncertain and endogenous to lifestyle and health behavior this setup can be conceptualized as a strive for immortality that is never reached we discuss adjustment dynamics and show that the new setup is particularly useful to understand aging of the oldest old i e of individuals for which morbidity and mortality have reached a plateau we then show how the existence of a steady state can be used to perform comparative dynamics exercises analytically as an illustration we investigate the effects of more expensive health investment and of advances in medical technology on optimal short run and long run health behavior

differential mortality and social security this paper studies the normative problem of redistribution between individuals who differ in their lifespans we discuss aspects related to the objective function and argue that aversion to multiperiod inequality should be taken into account then we study the properties of the social optimum both with full information and with asymmetric information we highlight the role of aversion to multiperiod inequality and show that it has substantial consequences on the design of social security schemes in particular we show that for a low resp high aversion to multiperiod inequality a negative resp positive implicit tax rate on continued activity is desirable

a simple explanation of some key time preference anomalies individual time discounting behaviour experimentally exhibits important anomalies that are inconsistent with the standard discounted utility model these include the time preference reversal characteristic of hyperbolic discounting the magnitude effect and the extreme sign effect i propose a simple explanation of discounting that accounts for these three anomalies simultaneously within the context of the expected utility model with uncertainty risk aversion and preference for precautionary saving experimentalement le comportement individuel dans l escompte du temps revele des anomalies importantes qui cadrent mal avec le modele standard de l utilite anticipee ce sont par exemple le renversement de la preference temporelle qui caracterise le processus d escompte hyperbolique ou l effet de magnitude ou l effet de signe extr me on propose une explication simple du comportement d escompte qui explique simultanement ces trois anomalies dans le cadre du modele d utilite anticipee en presence d incertitude d aversion au risque et de preference pour l epargne de precaution

is there one unifying concept of utility an experimental comparison of utility under risk and utility over time the nature of utility is controversial whereas decision theory commonly assumes that utility is context specific applied and empirical decision analysis typically assumes one unifying concept of utility applicable to all decision problems this controversy has hardly been addressed empirically because of the absence of methods to measure utility outside the context of risk we introduce a method to measure utility over time and compare utility under risk and utility over time we distinguish between gains and losses and also measure loss aversion in two experiments we found that utility under risk and utility over time differed and were uncorrelated utility under risk was more curved than utility over time subjects were loss averse both for risk and for time but loss aversion was more pronounced for risk loss aversion over risk and time were uncorrelated this suggests that loss aversion although important in both decision contexts is volatile and subject to framing

strikes wages and private information private information models of strikes suggest that the strike is used as an information revealing device by the union in the presence of asymmetrical information a testable prediction of these models is that there is a negative relationship between strikes and the unpredicted component of the wage this paper finds evidence of such a relationship in a large sample of u s labor contracts the real wage falls by about 3 percent after a strike lasting one hundred days copyright 1989 by american economic association

magnitude time and risk differ similarly between joint and single evaluations arguably all choice options involve three basic attributes magnitude outcome size time of occurrence and probability of occurrence and are evaluated in one of two basic evaluation modes je joint evaluation involving comparison of multiple options and se single evaluation without comparison this research explores how reactions to the three basic attributes and their associated functions utility time discounting and probability weighting vary between the two basic evaluation modes nine studies tapping diverse contexts yield two general results first for all these attributes people are more sensitive to variations near endpoints zero magnitude no delay and 0 or 100 probability than in other regions and this differential sensitivity is more pronounced in se than in je second when faced with options involving a trade off between magnitude and time delay or between magnitude and probability risk people are both more delay averse and more risk averse in se than in je

anomalies in intertemporal choice evidence and an interpretation research on decision making under uncertainly has been strongly influenced by the documentation of numerous expected utility eu anomalies behaviors that violate the expected utility axioms the relative lack of progress on the closely related topic of intertemporal choice is partly due to the absence of an analogous set of discounted utility du anomalies we enumerate a set of du anomalies analogous to the eu anomalies and propose a model that accounts for the anomalies as well as other intertemporal choice phenomena incompatible with du we discuss implications for savings behavior estimation of discount rates and choice framing effects

x inefficiency and interfirm rivalry evidence from the electric utility industry competition from the natural gas industry is shown to increase the efficiency of the work force of electric power utilities this conclusion is qualified to the extent that duopoly rivalry does not represent perfect competition in a free market as natural gas reserves decline however the impetus to improve efficiency will diminish but this will be offset by technological advances in both power generation and power transmission if regulators develop policies to encourage competitive interplay utility performance is more likely to improve 38 references 3 tables dck

a nonparametric test for economies of scope this paper presents a simple test for economies of scope using nonparametric methods rather than elaborate estimation techniques the test reveals that nonporfit hospitals diversified into psychiatric services realize neither economies nor diseconomies of scope the test may be useful for policy markers concerned about whether diversification activities by certain groups of firms enhance efficiency or produce anticompetitive effects

systematic departures from the frontier a framework for the analysis of firm inefficiency departures from a production or cost frontier may reflect the systematic effect of conditions that contribute to inefficiency to test whether some portion of frontier function departures can be systematically explained the frontier inefficiency error component is modeled as a function of various causal factors and a random component the functional form of the inefficiency error term model is chosen to assure strict one sidedness preliminary empirical results generated from electric utility data suggest the superiority of including both systematic and random components in the inefficiency error term

logit estimates of strike incidence from canadian contract data logit estimates of strike incidence are made based on a unique and comprehensive data set of 2 437 collective agreements the appropriate level of aggregation since that is where bargaining occurs the results are interpreted through a theoretical framework emphasizing that strikes are more likely when the joint costs of using the strike mechanism are low relative to the cost of alternative mechanisms for achieving the same purposes such functions of strikes are to generate information elicit truth telling establish reputations provide catharsis and solve intraorganizational conflict

value functions for infinite period planning cost benefit and risk analysis studies that model tradeoffs between the present and the distant future by means of present value discounting have been criticized for according the future and thus future generations far too little importance this paper presents an alternative means of modeling tradeoffs between different periods that accords the future far more importance than present value discounting and that is no more difficult to apply the paper also presents a means of modeling the preference issue of concern for equity or stability between different periods

optimal pollution abatement under sustainable and other social time preferences this paper analyses optimal pollution abatement expenditure and the pricing of pollution under alternative social time preferences including sustainable preferences defined as those that are consistent with two axioms of sustainable development introduced by chichilnisky land econ 73 467 491 1997 these axioms state essentially that neither the welfare of present nor future generations ought to be favoured over the other in determining the socially optimal path of economic development the method is to calibrate a modified ramsey model of optimal global growth and saving where pollution is generated by the global output of goods and services pollution in turn reduces output the simulation results illustrate how sensitive the optimal pollution price and abatement expenditure can be over time to assumptions about the social time preference rate they also show that sustainable preferences impose a lower burden on future generations in terms of the pollution price and abatement expenditure hence there is a case for governments to make explicit their value judgments about intergenerational welfare in the context of their notion of sustainable development when setting target pollution abatement levels and pollution prices over time

retirement spending and biological age abstract we solve a lifecycle model in which the consumer s chronological age does not move in lockstep with calendar time instead biological age increases at a stochastic non linear rate in time like a broken clock that might occasionally move backwards in other words biological age could actually decline our paper is inspired by the growing body of medical literature that has identified biomarkers which indicate how people age at different rates this offers better estimates of expected remaining lifetime and future mortality rates it isn t farfetched to argue that in the not too distant future personal age will be more closely associated with biological vs calendar age thus after introducing our stochastic mortality model we derive optimal consumption rates in a classic yaari 1965 framework adjusted to our proper clock time in addition to the normative implications of having access to biological age our positive objective is to partially explain the cross sectional heterogeneity in retirement spending rates at any given chronological age in sum we argue that neither biological nor chronological age alone is a sufficient statistic for making economic decisions rather both ages are required to behave rationally

strotz meets allais diminishing impatience and the certainty effect abstract decision makers tend to exhibit a higher degree of impatience when considering a delay to an immediate reward than when contemplating an identical delay to an equal future reward this work argues that diminishing impatience originates from the distinction between the certain present and the risky future a simple functional representation of preferences exhibiting time inconsistency when the future is uncertain is derived experimental evidence which is inconsistent with other formulations that account for diminishing impatience supports the proposed approach the new theory uncovers a tight relation between diminishing impatience and well known behavioral regularities in choice under risk and uncertainty jel d12 d81

are combination gas and electric utilities multiproduct natural monopolies gas and electric services are provided in some locations by a single firm in others by two firms the loss of competition inherent in single firm provision can be justified by the presence of both economies of scope and product specific economies of scale for each output in multiproduct production the estimation of a multiproduct hybrid translog cost function shows no evidence of such economies at the mean combination utility output vector copyright 1987 by mit press

behavior of the firm under regulatory constraint a recent article by akira takayama discusses an earlier paper by harvey averch and leland l johnson on fair rate of return regulation of public utilities although takayama p 255 agrees with averch and johnson s general conclusions that a firm will tend to increase its investment with the introduction of an active constraint on its rate of return he criticizes the a j argument as being confusing ambiguous and in error takayama then attempts a clarification and presents a new formulation which leads to the a j result quoted above this comment will discuss several of takayama s criticisms in addition to showing that the so called a j effect cannot be derived from the basic assumptions made by both averch and johnson and takayama 1 we will show that the very assumptions used to prove the a j effect by defining the region of x require an assumption that the a j effect exists in the first place

life cycle preferences revisited an axiomatic construction for life cycle preferences accounting for the finiteness and the randomness of life duration is provided we emphasize the role of intertemporal correlation aversion and explain why multiplicative preferences provide an interesting alternative to additive preferences allowing risk aversion and intertemporal elasticity of substitution to be separated implications regarding the shape of the optimal consumption profiles are discussed

risk aversion and the value of life we show that state non separable preferences a la epstein zin weil ezw provide a tractable and flexible framework to study the economics of health and longevity this utility representation 1 admits a preference for timing of resolution of uncertainty regarding mortality risks 2 links the marginal valuation of survival to the level of survival 3 can preserve homotheticity even for low degrees of intertemporal substitution without generating implausible predictions regarding the value of life and 4 adds needed flexibility to account for the empirical evidence on the value of life we illustrate the implications of ezw preferences for the economic value of observed differences in life expectancy across countries and over time and for the value of life over the life cycle

comparative risk aversion a formal approach with applications to saving behavior we consider a formal approach to comparative risk aversion and applies it to intertemporal choice models this allows us to ask whether standard classes of utility functions such as those inspired by kihlstrom and mirman 1974 selden 1978 epstein and zin 1989 and quiggin 1982 are well ordered in terms of risk aversion moreover opting for this model free approach allows us to establish new general results on the impact of risk aversion on savings behaviors in particular we show that risk aversion enhances precautionary savings clarifying the link that exists between the notions of prudence and risk aversion

accidental bequests a curse for the rich and a boon for the poor when accidental bequests signal otherwise unobservable individual characteristics such as productivity and longevity the population should be partitioned into two groups those who do not receive an inheritance and those who do the first tagged group receives a mirrlees second best tax schedule the second group when its type is fully revealed faces a first best tax schedule receiving an inheritance makes high ability types worse off and low ability types better off high ability individuals face a bequest tax of more than 100 percent while low ability types face a bequest tax that can be smaller as well as larger than 100 percent and it might even be negative

a note on longevity enhancing investment we argue that risk averse individuals prefer to increase their longevity in the direction of rectangularization of the survival curve instead of an upward shift of that curve risk aversion is measured by the concept of fear of ruin

models as usual for unusual risks on the value of catastrophic climate change we study the role of alternative intertemporal preference representations in a model of economic growth stock pollutant and endogenous risk of catastrophic collapse we contrast the traditional discounted utility model which assumes risk neutrality with respect to intertemporal utility with a multiplicative choice model that displays risk aversion in that dimension first we show that both representations of preferences can rationalize the same business as usual economy for a given interest rate and no pollution externality second once we introduce a collapse risk whose hazard rate is a function of the pollution stock multiplicative preferences recommend a much more stringent policy response an illustration in the context of climate change indicates that switching to the multiplicative preference representation has a similar effect in terms of policy recommendations as scaling up the schedule of the hazard rate by a factor of 100

health and other asset holdings despite clear evidence of correlations between financial and medical statuses and decisions most models treat financial and health related choices separately this article bridges this gap by proposing a tractable dynamic framework for the joint determination of optimal consumption portfolio holdings health investment and health insurance we solve for the optimal rules in closed form and capitalize on this tractability to gain a better understanding of the conditions under which separation between financial and health related decisions is sensible and of the pathways through which wealth and health determine allocations welfare and other variables of interest such as expected longevity or the value of health furthermore we show that the model is consistent with the observed patterns of individual allocations and provide realistic estimates of the parameters that confirm the relevance of all the main characteristics of the model

strategic bargaining models and interpretation of strike data attrition screening and signalling models of strategic bargaining are characterized in terms of their predictions about the incidence mean duration and settlement rates of strikes and the terms of wage settlements these predictions are compared with the general features observed in empirical studies of strikes in canada and the united states conclusions are drawn about the types of models capable of generating these features and about the conformity of the models to the evidence methods are described for computing the numerical examples used to illustrate the models

an empirical test of an asymmetric information model of strikes recent developments in the theory of strategic bargaining demonstrate how informational asymmetries can lead to prolonged and costly bargaining these models can be applied to contract negotiations yielding an economic theory of strikes to date however few empirical tests of these models have been carried out in this paper a set of predictions concerning the incidence and unconditional duration of strikes is derived from a simple bargaining model in which the union is uncertain about the firm s future profitability these predictions are then tested on a micro data set of major u s contract negotiations that took place from 1973 to 1977

strikes and wages a test of an asymmetric information model this paper describes a simple model of labor disputes based on the hypothesis that unions use strikes to infer the profitability of the firm the model posits the existence of a negatively sloped resistance curve between wages and strike duration in addition it offer a series of predictions relating wage and strike outcomes to changes in the expected profitability of the firm and changes in the alternative opportunities of striking workers these implications are tested using data on wage outcomes strike probabilities and strike durations for a large sample of collective bargaining agreements

the cost of air pollution abatement using data from the u s census bureau the authors have developed comprehensive estimates of pollution abatement costs by industry sector for several major air pollutants their results provide conservative benchmarks for benefit cost analysis of pollution control strategies in developing countries they also provide striking evidence of inefficiency in u s command and control regulation the cost estimates reflect the experience of about 100 000 u s manufacturing facilities under actual operating conditions they are based on a complete accounting of costs including capital labor energy materials and services so they should be more useful for benefit cost analysis than idealized engineering estimates but they also reflect strict pollution control regulation and input prices which are probably somewhat higher on average than those in developing countries they should be interpreted as conservative estimates for environmental planning in developing countries regulatory options that are judged to have high net benefits using these numbers would probably look even better if local abatement cost data were available the estimates in this paper can provide useful information for pollution charges they can also help make targeted regulation more cost effective with scarce resources for monitoring and enforcement new regulatory institutions in developing countries will want to focus initially on industry sectors that are the main sources of locally dangerous pollutants after those sectors are identified targeted regulation should be informed by sectoral differences in abatement cost the estimates suggest for example that cost effective control of suspended particulate emissions will focus on wood pulping rather than steelmaking when both are major sources of suspended particulates the reason average particulate abatement costs are four times higher in steelmaking

longevity genes and efforts an optimal taxation approach to prevention this paper applies the analytical tools of optimal taxation theory to the design of the optimal subsidy on preventive behaviours in an economy where longevity varies across agents and depends on preventive expenditures and on longevity genes public intervention can be here justified on three grounds corrections for misperceptions of the survival process and for externalities related to individual preventive behaviour and redistribution across both earnings and genetic dimensions the optimal subsidy on preventive expenditures is shown to depend on the combined impacts of misperception externalities and self selection it is generally optimal to subsidize preventive efforts to an extent depending on the degree of individual myopia on how productivity and genes are correlated and on the complementarity of genes and preventive efforts in the survival function

aggressive oil extraction and precautionary saving coping with volatility the effects of stochastic oil demand on optimal oil extraction paths and tax spending and government debt policies are analyzed when the oil demand schedule is linear and preferences quadratic without prudence optimal oil extraction is governed by the hotelling rule and optimal budgetary policies by the tax and consumption smoothing principle volatile oil demand brings forward oil extraction and induces a bigger government surplus with prudence the government depletes oil reserves even more aggressively and engages in additional precautionary saving financed by postponing spending and bringing taxes forward especially if it has substantial monopoly power on the oil market gives high priority to the public spending target is very prudent and future oil demand has high variance uncertain economic prospects induce even higher precautionary saving and if non oil revenue shocks and oil revenue shocks are positively correlated even more aggressive oil extraction in contrast prudent governments deliberately underestimate oil reserves which induce less aggressive oil depletion and less government saving but less so if uncertainty about reserves and oil demand are positively correlated

the determinants of strikes in the united states 1900 1977 this study aims to assess the recent debate that has emerged in the literature over the economic and organizational political models of strikes and to propose and test a synthesis of those models as an explanation for the pattern of strike activity in the united states since 1900 the paper begins with a review of strike activity in the post 1900 period and then develops a conceptual framework incorporating six factors the size of union membership economic conditions political events institutional arrangements psychological variables and the extent of rival unionism to explain this historical pattern the second part of the paper contains a regression analysis of strike activity over the 1900 1977 period the regression results show that both the economic factors of unemployment and inflation and various noneconomic factors such as changes in union membership the outbreak of world war ii and enactment of new deal legislation are significant in explaining variations in strike activity during t

risk and preference reversals in intertemporal choice abstract this paper argues that observations of non stationary choice behavior need not necessarily imply specific properties of the individual s discount function as we show the observed preference reversals in intertemporal choice are consistent with constant discounting and can alternatively be explained by decreasing absolute risk aversion together with the individual s risk perception this risk may concern the size of the actual outcome or the endowment consumption stream to which the outcome is added both types of uncertainty naturally appear in the context of intertemporal choice we show how relative degrees of changes in risk over time can determine choices