an empirical analysis of life cycle fertility and female labor supply this paper examines us household fertility and female labor supply over the life cycle using data from the panel study of income dynamics the authors investigate how maternal time inputs and market expenditures on offspring as well as the benefits they yield their parents vary with ages of offspring and influence female labor supply and contraceptive behavior the econometric framework combines a female labor supply model and a contraceptive choice index function it also accounts for the fact that conceptions are not perfectly controllable events using longitudinal data on married couples the authors estimate these equations and test alternative specifications of the technologies governing child care the findings suggest that while parents cannot perfectly control conceptions variations in child care costs do affect life cycle spacing of births furthermore the results demonstrate the gains of modeling the linkages between female labor supply and fertility behavior at the household level authors modified

the ellsberg paradox and risk aversion an anticipated utility approach the paper describes a decision process under which it is rational to prefer a lottery with known probabilities to a similar ambiguous lottery where the decision maker does not know the exact values of the probabilities the ellsberg paradox this is done by modeling ambiguous lotteries as two stage lotteries by assuming the independence axiom without the reduction of compound lotteries axiom and by using the anticipated utility functional this paper also gives conditions under which less ambiguity is preferred and presents some comparative statics analysis as well as some inter personal comparisons finally it proves that within the anticipated utility framework risk and ambiguity are almost identical copyright 1987 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

teen motherhood and abortion access it is argued that the net effect of any restriction of abortion access on birth rates is an empirical question this study examines the impact of access to abortion on county teenage birth rates birth rates are expected to decrease by 1 among white adolescents aged 15 19 years for a 25 mile increase in the distance to the nearest abortion provider particularly among in wedlock births data are obtained from 1973 88 national natality local area summary files for counties in the us and four other national sources data did not provide useful information on the empirical relationship between access and birth rate for densely populated urban areas cross sectional findings that had omitted variable bias indicate that an increase of 25 miles in distance to a provider was associated with an additional 1 4 births per 1000 white teenage women or a 3 increase in the average teen birth rate of 45 1000 white teenagers the findings from a county fixed effects model that controlled for omitted variable bias indicate that an increase of 25 miles was associated with a reduction in teen births of 0 5 1000 or about 1 of the mean birth rate both medicaid restrictions and parental consent laws were negative and significant and more negative in poor and more isolated counties the state year effects models did not change findings on distance and medicaid restriction effects the effects of changes in timing of laws suggests that laws followed preexisting trends changes in distance to provider were primarily in the first 2 years following the change out of wedlock births were unaffected by changes in distance to providers the out of wedlock teen birth rate increased with a complete ban on abortions fewer wanted births were associated with small restrictions findings imply that closing of clinics during 1977 88 had an impact on teen birth rates of under one tenth of 1 the 20 increase in teen births was unexplained

affirmative action in higher education how do admission and financial aid rules affect future earnings this paper addresses how changing the admission and financial aid rules at colleges affects future earnings i estimate a structural model of the following decisions by individuals where to submit applications which school to attend and what field to study the model also includes decisions by schools as to which students to accept and how much financial aid to offer simulating how black educational choices would change were they to face the white admission and aid rules shows that race based advantages had little effect on earnings however removing race based advantages does affect black educational outcomes in particular removing advantages in admissions substantially decreases the number of black students at top tier schools while removing advantages in financial aid causes a decrease in the number of blacks who attend college

family planning in a life cycle model with income risk several us states have recently restricted the access to abortions we study fertility intentions and how family planning and abortions are used as mechanisms to control fertility among couples facing income risk we formulate and estimate a life cycle consumption saving model with uninsurable income risk and imperfect contraceptive control that matches fertility behavior in the british household panel survey bhps well we use the estimated model to investigate how family planning and abortions are used to control fertility in our model our simulations suggest that income risk affects family planning and that abortion is used to control fertility due to the presence of income risk this indicates that the availability of abortions might play a role as an insurance mechanism

preference reversals and the independence axiom of all of the paradoxical patterns of behavior reported in laboratory experiments one of the most perplexing for decision theorists is the preference reversal phenomenon a subject in a preference reversal experiment is typically given a choice between a lottery with a high probability of winning a modest amount of money a p bet and a lottery with a low probability of winning a large amount of money a bet the lowest amount of money for which the subject would willingly sell either of these lotteries is also elicited the most common reversal is for a subject to choose the p bet over the bet but to put a higher selling price on the bet preference reversals were first reported by harold lindman 1971 and sarah lichtenstein and paul slovic 1971 in discussing the psychologists discovery of such reversals david grether and charles plott remark the inconsistency is deeper than mere lack of transitivity or even stochastic transitivity it suggests that no optimization principles of any sort lie behind even the simplest of human choices 1979 p 623 this paper offers a simple alternative explanation of documented preference reversals an explanation that does not require the abandonment of the transitivity assumption

comovement in international equity markets a sectoral view abstract we investigate shifts in correlation patterns among international equity returns at the market level as well as the industry level we develop a novel bivariate garch model for equity returns with a smoothly time varying correlation and then derive a lagrange multiplier statistic to test the constant correlation hypothesis directly applying the test to weekly data from germany japan the uk and the us in the period 1980 2000 we find that correlations among the german uk and us stock markets have doubled whereas japanese correlations have remained the same both dates of change and speeds of adjustment vary widely across countries and sectors

the effect of spending cuts on teen pregnancy in recent years english local authorities have been forced to make significant cuts to devolved expenditure in this paper we examine the impact of reductions in local expenditure on one particular public health target reducing rates of teen pregnancy contrary to predictions made at the time of the cuts panel data estimates provide no evidence that areas which reduced expenditure the most have experienced relative increases in teenage pregnancy rates rather expenditure cuts are associated with small reductions in teen pregnancy rates a result which is robust to a number of alternative specifications and tests for causality underlying socio economic factors such as education outcomes and alcohol consumption are found to be significant predictors of teen pregnancy

the intertemporal relation between the u s and japanese stock markets this paper finds a high correlation between the open to close returns for u s stocks in the previous trading day and the japanese equity market performance in the current period in contrast the japanese market has only a small impact on the u s return in the current period high correlations among open to close returns are a violation of the efflcient market hypothesis however in trading simulations the excess profits in japan vanish when transactions costs and transfer taxes are included the two largest stock markets in the world in terms of capitalization volume and shares listed are the tokyo stock exchange tse and the new york stock exchange nyse because tokyo is 14 hours ahead of new york there is an eight and one half hour difference between the close of the tse and open of the nyse since there is no overlap between the two markets traders or technical analysts may look to the tse as a predictor of market movement on the nyse and or examine changes on the nyse as indicators of tse performance as shown in figure 1 the tse opens at 7 00 p m eastern standard time est and closes at 1 00 a m est 1 the nyse opens at 11 30 p m japanese time 9 30 a m est and closes at 5 00 a m japanese time 4 00 p m est thus there is no common time interval in which both markets are open high correlations between the respective open to close returns are a violation of the efficient market hypothesis because public information about the performance in one market could be used to profitably trade in another market if the markets are efficient information about the open to close performance in one market for example the u s return in period t 1 will be fully reflected in the open price of the other market japan in period t for example since new information flows randomly into the market subsequent price changes should be random and the open to close returns in japan will be uncorrelated with the u s returns thus the u s performance should affect the open price in japan and the correlation between the open to close returns of the two markets will be zero early research on the synchronization among stock prices across countries grubel 1968 levy and sarnat 1970 agmon 1972 ripley 1973 lessard

decreasing risk aversion and mean variance analysis on formule un ensemble de postulats d aversion pour le risque absolu decroissant et on montre que seules les fonctionnelles d utilite moyenne variance peuvent les satisfaire

market overreaction and investment strategies we investigated the overreaction of the korean market in response to shocks in the us stock market and analysed the dynamic relationship between these two markets since 1996 we found that the kospi 200 index futures overreacted to the s p 500 index returns during the period from 2000 to 2009 when the korean market was in its growth stage as the korean market matured and the kospi 200 overnight futures were introduced in 2009 the overreaction disappeared when investors employed the kelly model or value at risk to exploit the overreaction their trading strategies produced significant profits during the growth stage even after considering transaction costs and risk but the profits attenuated once the overnight futures market was launched in 2009

habit persistence and teen sex could increased access to contraception have unintended consequences for teen pregnancies we develop a dynamic discrete choice model of teen sex and pregnancy that incorporates habit persistence habit persistence has two sources here the first is a fixed cost of having sex which relates to a moral or psychological barrier that has been crossed the first time one has sex the second is a transition cost whereby once a particular relationship has progressed to sex it is difficult to move back we estimate significant habit persistence in teen sex implying that the long run effects of contraception policy may be different from their short run counterparts especially if the failure rate of contraception is sufficiently large programs that increase access to contraception are found to decrease teen pregnancies in the short run but increase them in the long run

international stock market linkages evidence from the pre and post october 1987 period abstract this paper uses recent developments in the theory of cointegration to provide new methods of testing the linkage and dynamic interactions among stock market movements our findings are in sharp contrast with previous research which discovered strong interdependence among national stock markets prior to october 1987 for the post october 1987 period however our results show that the degree of international co movements among stock price indices has increased substantially with the nikkei index the only exception furthermore the us stock market is found to have a considerable impact on the french german and uk markets in the post crash period we also find the response of the french german and uk markets to us stock market innovations to be consistent with the view of cross border informationally efficient stock markets finally we find the japanese equity market performance to have no links with both the us stock market and the stock markets in france germany and uk during the pre and post october crash period

health risky behaviour and the value of medical innovation for infectious disease we propose a dynamic framework to study the value of medical innovation in the context of infectious disease we apply our framework to evaluate an hiv treatment breakthrough known as haart the model captures how in lowering both the expected cost and likelihood of hiv infection haart reduced the implicit price of risky sex forward looking agents responded by optimally shifting their behaviour the model also imposes equilibrium constraints explicitly capturing how optimal shifts in behaviour affect equilibrium choices by changing both infection probabilities and the ease of finding partners willing to engage in risky sex using the estimated model we conduct counterfactual simulations to compute the value of haart from the perspective of uninfected agents this includes the option value of the innovation along with value accruing from changes in sex behaviour in response to haart introduction we also calculate the added value of a fully functional vaccine from the perspective of both infected and uninfected agents where infected agents benefit from a vaccine due to resulting shifts in market equilibrium

the paradox of the pill heterogeneous effects of oral contraceptive access the twentieth century saw dramatic increases in nonmarital births concentrated heavily among poor and working class women in this paper we investigate whether the oral contraceptive pill played a causal role in the rise of nonmarital births exploiting exogenous variation in laws governing access to the pill we find that changes in marital access to the pill increased the nonmarital birthrate by between 15 and 18 accounting for about one third of the overall increase in nonmarital births these effects are concentrated almost entirely among women whose fathers did not graduate high school and among minority women we also document that the pill increased spacing between first and second births and lowered the probability that a woman obtained a high school diploma consistent with increases in nonmarital births we find no evidence that postsecondary education levels were influenced by pill access and no evidence that nonmarital births move with male employment patterns our findings add to a growing literature which documents the power of the pill to shape women s lives in broadly heterogenous ways with minority and less well educated women bearing the brunt of the losses a phenomenon we call the paradox of the pill jel j12 j13 i24

economic theory of choice and the preference reversal phenomenon a reexamination in a recent issue of this review david grether and charles plott 1979 hereinafter referred to as g p presented a series of experiments that show that individual decisions are made in a manner inconsistent with standard preference theory this inconsistency can be illustrated by the following example individuals under suitable laboratory conditions first have a choice between a lottery with a high probability of winning a small sum of money the p bet probability bet and a lottery with a high stake but low probability of winning the m bet money bet after indicating a preference for one of the lotteries in the pair the same subjects are then asked to place a monetary value on each of the individual lotteries grether and plott found that a large number of participants stated a preference for the p bet in the first round but placed a higher value on the other lottery the m bet in the second round this behavior a preference reversal is inconsistent with the traditional statements of preference theory

the welfare cost of macroeconomic uncertainty in the post war period abstract with standard assumptions on preferences and a fully fledged econometric model we computed the welfare costs of macroeconomic uncertainty for post war u s using the beveridge nelson decomposition welfare costs are about 0 9 per capita consumption 175 77 a year and marginal welfare costs are about twice as large

disappointment in decision making under uncertainty decision analysis requires that two equally desirable consequences should have the same utility and vice versa most analyses of financial decision making presume that two consequences with the same dollar outcome will be equally preferred however winning the top prize of 10 000 in a lottery may leave one much happier than receiving 10 000 as the lowest prize in a lottery this paper explores the implications of disappointment a psychological reaction caused by comparing the actual outcome of a lottery to one s prior expectations for decision making under uncertainty explicit recognition that decision makers may be paying a premium to avoid potential disappointment provides an interpretation for some known behavioral paradoxes and suggests that decision makers may be sensitive to the manner in which a lottery is resolved the concept of disappointment is integrated into utility theory in a prescriptive model

consumer confidence and rational expectations are agents beliefs consistent with the theory consumer confidence is found to have predictive content for a wide range of macroeconomic variables including consumption growth contrary to standard repih we find that on uk data the repih is rejected due to the predictive content of consumer confidence and not labour income we explain this finding in terms of precautionary behaviour extending the hansen and singleton consumption capm model to allow a conditional variance we find a high level of confidence is associated with both greater optimism about the level of consumption and greater uncertainty about the forecaster variance once allowance is made for time aggregation the over identifying restrictions implied by this model are accepted we estimate a small but statistically significant intertemporal elasticity of substitution

entrepreneurship social mobility and income redistribution in south india development economists have been preoccupied with the problem of increasing the size of the gnp pie to the relative neglect of its distribution despite the recent disenchantment with the viewpoint that all classes share in the benefits of industrial growth empirical data on the distribution of income business opportunity and economic power are in short supply many of the studies on entrepreneurship and economic development when they are not apologetics for ruthless capitalist exploitation as paul baran suggests extol the achievements of the capitalist entrepreneur without examining class origins and monopoly advantage joseph schumpeter sees entrepreneurs irrespective of class origin as heroic figures with the dream and will to found a private kingdom to conquer adversity to achieve success for its own sake and to experience the joy of creation for gustav papanek 1967 the private entrepreneur who is frugal diligent far sighted remarkably able and willing to take political risks is in large part responsible for the success of pakistan in achieving rapid industrialization

a theory of disappointment aversion an axiomatic model of preferences over lotteries is developed it is shown that this model is consistent with the allais paradox includes expected utility theory as a special case and is only one parameter beta richer than the expected utility model allais paradox type behavior is identified with positive values of beta preferences with positive beta are said to be disappointment averse it is shown that risk aversion implies disappointment aversion and that the arrow pratt measures of risk aversion can be generalized in a straight forward manner to the current framework copyright 1991 by the econometric society

risk perception in psychology and economics abstract the concept of rationality has been basic to most economic analysis its content has been successively refined over the generations as applied to the static world of certainty it has turned out to be a weak hypothesis not easily refuted and therefore not very useful as an explanation though not literally a tautology but recent decades have seen the development of stronger versions applied to a world in which time and uncertainty are real among its most important manifestations have been criteria for consistency in allocation over time the expected utility hypothesis of behavior under uncertainty and what may be termed the bayesian hypothesis for learning that is the consistent use of conditional probabilities for changing beliefs on the basis of new information these hypotheses have been used widely in offering explanations of empirically observed behavior though as not infrequently in economics the theoretical development has gone much further than the empirical implementation these hypotheses have also been used increasingly in normative analysis as a component of benefit cost studies therefore frequently referred to as benefit risk studies the value of reducing mortality rates from diseases for example has been studied by assuming that choice of occupations is made inter alia by comparing wage differences with mortality differences

correlations in price changes and volatility across international stock markets the short run interdependence of prices and price volatility across three major international stock markets is studied daily opening and closing prices of major stock indexes for the tokyo london and new york stock markets are examined the analysis utilizes the autoregressive conditionally heteroskedastic arch family of statistical models to explore these pricing relationships evidence of price volatility spillovers from new york to tokyo london to tokyo and new york to london is observed but no price volatility spillover effects in other directions are found for the pre october 1987 period article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

stealth trading in options markets we investigate how price discovery occurs in the options markets through traders trade size choice by employing transactions data on all options traded on a sample of 100 firms we show that informed traders fragment their orders into small medium trades for low high volume contracts we also find that almost 60 of the price discovery occurs in the exchange with the largest market share for a given option where informed traders favor medium size trades upon examining distinct option series for a given stock we find that at the money calls display the highest information share

saving and liquidity constraints this paper is concerned with the theory of saving when consumers are not permitted to borrow and with the ability of such a theory to account for some of the stylized facts of saving behavior the models presented in the paper seem to account for important aspects of reality that are not explained by traditional life cycle models copyright 1991 by the econometric society

the costs of recession a reply pemberton i 995 raises the important issue of what is the most appropriate way to measure business cycle costs from an individual perspective as always in these matters it is not nor should it be a case of outright victory of one side over the other rather it is a question of which approach is the more plausible and on this we would wish to defend our shade of grey as being the more plausible measure this brief reply explains why imagine the simplest possible textbook experiment used to explain some of the principles of expected utility maximisation a prize in our case employed consumption c can be won with a given probability and the alternative is the booby prize of unemployed consumption let c be the expected value of this gamble and let c be the amount for which the player would be indifferent to the gamble the risk premium is then simply the difference between c and c this is exactly what is given by equation 9 in clark et al i994 equation 2 in pemberton s comment where the risk premium is measured as a proportion of employed consumption so there is nothing mysterious about our recession cost measure it is simply the standard textbook risk premium it would seem to us to be a very natural experiment to consider when measuring the cost of agents exposure to risks and we termed it the net cost measure our gross cost measure is given by i c c which is described by our equation 7 this is just the risk premium plus the difference between employed consumption and expected consumption again all measured relative to employed consumption we argued that the gross measure was one which would appeal to keynesians who because they view cycles as disequilibrium events would wish to include losses in consumption as part of the costs pemberton s statement that a high equilibrium natural rate of unemployment is surely a major problem is an implicit endorsement of the keynesian cost measure in our view the net measure because it measures the risk premium obviously abstracts away from any consumption losses as a result of drawing the booby prize this is exactly the same idea as lucas in his proposed cost measure who because of his view that business cycles are equilibrium events does not accept consumption losses as a proper part of costs the lucas measure and our own compare a risky consumption path with a riskless stream our measure differs from lucas however in one important respect from the macro perspective that he adopts the important comparison when measuring economic fluctuations and their impact on the welfare of representative agents is the deviation of consumption from its trend path thus lucas recession cost measure depends on the variance of consumption around that path unusually high aggregate consumption is as costly as unusually low

international transmission of stock market movements this paper investigates the international transmission mechanism of stock market movements by estimating a nine market vector autoregression var system using simulated responses of the estimated var system we i locate all the main channels of interactions among national stock markets and ii trace out the dynamic responses of one market to innovations in another generally speaking a substantial amount of multi lateral interaction is detected among national stock markets innovations in the u s are rapidly transmitted to other markets in a clearly recognizable fashion whereas no single foreign market can significantly explain the u s market movements also the dynamic response pattern is found to be generally consistent with the notion of informationally efficient international stock markets

the structure of interdependence in international stock markets abstract this study investigates the dynamic structure of nine major stock markets using an error correction model and directed acyclic graphs dag the dag representation provides a structure of causality among these markets in contemporaneous time building on this contemporaneous structure and the estimated error correction model innovation accounting techniques are applied the results show that the japanese market is among the most highly exogenous and the canadian and french markets among the least exogenous in our nine market study the us market is highly influenced by its own historical innovations but it is also influenced by market innovations from the uk switzerland hong kong france and germany the us market is the only market that has a consistently strong impact on price movements in other major stock markets in the longer run

a theory of anticipated utility abstract a new theory of cardinal utility with an associated set of axioms is presented it is a generalization of the von neumann morgenstern expected utility theory which permits the analysis of phenomena associated with the distortion of subjective probability

life cycle schooling and dynamic selection bias models and evidence for five cohorts of american males this paper examines an empirical regularity found in many societies that family influences on the probability of transiting from one grade level to the next diminish at higher levels of education we examine the statistical model used to establish the empirical regularity and the intuitive behavioral interpretation often used to rationalize it we show that the implicit economic model assumes myopia the intuitive interpretive model is identified only by imposing arbitrary distributional assumptions onto the data we produce an alternative choice theoretic model with fewer parameters that rationalizes the same data and is not based on arbitrary distributional assumptions

an analysis of out of wedlock childbearing in the united states this paper relates the erosion of the custom of shotgun marriage to the legalization of abortion and the increased availability of contraception to unmarried women in the united states the decline in shotgun marriage accounts for a significant fraction of the increase in out of wedlock first births several models illustrate the analogy between women who do not adopt either birth control or abortion and the hand loom weavers both victims of changing technology mechanisms causing female immiseration are modeled and historically described this technology shock hypothesis is an alternative to welfare and job shortage theories of the feminization of poverty excerpt

understanding the nature of the risks and the source of the rewards to momentum investing buying recent winners and shorting recent losers guarantees time varying factor exposures in accordance with the performance of common risk factors during the ranking period adjusted for this dynamic risk exposure momentum profits are remarkably stable across subperiods of the entire post 1926 era factor models can explain 95 of winner or loser return variability but cannot explain their mean return components are more profitable than those based on total returns neither industry effects nor cross sectional differences in expected returns are the primary cause of the momentum phenomenon article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

modeling heterogeneity and state dependence in consumer choice behavior in frequently purchased consumer goods markets consumer brand choices exhibit substantial persistence across purchase occasions in this article i estimate a choice model that admits of both heterogeneity in preferences and true state dependence as sources of this persistence using nielsen scanner data on ketchup i find evidence for true state dependence in the choice process even after controlling for a rich heterogeneity structure simulation of the model indicates that the long term effect of a promotion induced purchase on future purchase probabilities is positive but small

the intertemporal elasticity of substitution in consumption in the united states and the united kingdom as robert e hall 1988 notes the magnitude of the intertemporal elasticity of substitution in consumption is one of the central questions of macroeconomics do higher expected real interest rates lead to deferred consumption the authors extend hall s methodology and model and compare results for the united sta tes and the united kingdom in both cases they directly estimate the mo ving average process that temporal aggregation might induce in the random disturbances and take account of consumers who do not follow the lif e cycle permanent income model of consumption copyright 1992 by mit press

on measuring the welfare cost of business cycles lucas 1987 argues that the gain from eliminating aggregate fluctuations is trivial following lucas a number of researchers have altered assumptions on preferences and found that the gain from eliminating business cycles are potentially very large however in these exercises little discipline is placed on preference parameters this paper estimates the welfare cost of business cycles allowing for potential time non separabilities in preferences where discipline is placed on the choice of preference parameters by requiring that the preferences be consistent with observed fluctuations in a model of business cycles that is a theoretical real business cycle world is constructed and the representative agent is then placed in this world the agent responds optimally to exogenous shocks given the frictions in the economy the agent s preference parameters along with other structural parameters are estimated using a bayesian procedure involving markov chain monte carlo methods two main results emerge from the paper first the form for the time non separability estimated in this paper is very different than the forms suggested and used elsewhere in the literature second the welfare cost of business cycles is close to lucas s estimate

the costs of recession a comment using the approach described in the above quotation lucas i987 calculated that the representative consumer would give up only around i io of one per cent of base consumption as the price for eliminating all aggregate fluctuations subsequent work by manuelli and sargent i 988 and with some minor variations imrohoroglu i989 largely confirmed the apparently trivial nature of the business cycle clark leslie and symons i994 henceforth cls have challenged this conclusion using uk data on household consumption patterns they calculate costs for households with various characteristics for the representative household i e with average values for all relevant characteristics the cost is i 63 of base consumption and the mean value across all households is around 2 87 l these much higher costs certainly do not suggest that cycles are trivial cls present some useful and interesting empirical estimates of the impact of unemployment on individual consumption choices however i argue that they draw the wrong conclusion from their data and that the latter imply cyclical costs which are either zero or at least of similar trivial magnitude to lucas s cls assume that an individual is either employed with probability p or unemployed probability i p i use cls s notation throughout consumption in the two states is c and yc o y i respectively the utility function is crra whence expected utility eu is

stealth trading which traders trades move stock prices usingaudit trail data for a sample of nyse firms we show that medium size trades are associated with a disproportionately large cumulative stock price change relative to their proportion of all trades and volume this result is consistent with the predictions of barclay and warner s 1993 stealth tradinghypothesis we find that the source of this disproportionately large cumulative price impact of medium size trades is trades initiated by institutions this result is robust to various sensitivity checks our findings appear to confirm street lore that institutions are informed traders 2001 elsevier science s a all rights reserved

a dynamic model of contraceptive choice of spanish couples in this paper we propose a simple dynamic stochastic model of sterilization and contraceptive use and we estimate its structural parameters using a sample of married couples from the 1995 spanish family and fertility survey the estimated structural model improves on previous studies in terms of its ability to rationalize observed behavior the large proportion of women contracepting at parity 0 is interpreted as evidence of precautionary contraceptive behavior allowing for simple forms of permanent unobserved heterogeneity across couples in their ability to conceive has important implications for estimates of utility and cost parameters our estimates of child valuation parameters imply that most spanish couples would have two children but significant deviations from this goal are brought about by imperfect and costly fertility control our simulations suggest that the introduction of sterilization has reduced fertility by an average of 0 2 children per couple and that the availability of more effective reversible contraceptive methods would reduce expected fertility by up to 0 4 children per couple

on the welfare costs of business cycle fluctuations and economic growth variation in the 20th century and beyond lucas 1987 has shown a surprising result in business cycle research the welfare cost of business cycles are very small our paper has several original contributions first in computing welfare costs we propose a novel setup that separates the eects of uncertainty stemming from business cycle uctuations and economic growth variation second we extend the sample from which to compute the moments of consumption the whole of the literature chose primarily to we gratefully acknowledge the comments of caio almeida carlos e da costa robert f engle pedro c ferreira antonio fiorencio rodolfo manuelli samuel pessoa and octavio tourinho on this or on earlier versions of this paper all errors are ours we thank cnpq brazil faperj and inct for nancial support y corresponding author

risk aversion in the theory of expected utility with rank dependent probabilities expected utility with rank dependent probability theory is a model of decision making under risk where the preference relations on the set of probability distributions is represented by the mathematical expectation of a utility function with respect to a transformation of the probability distributions on the set of outcomes this paper defines based on g teaux differentiability measures of risk aversion for such preferences which characterize the relation more risk averse and applies these measures to the analysis of unconditional and conditional portfolio choice problems

choice under uncertainty problems solved and unsolved ffifteen years ago the theory of choice under uncertainty could be considered one of the success stories of economic analysis it rested on solid axiomatic foundations it had seen important breakthroughs in the analytics of risk risk aversion and their applications to economic issues and it stood ready to provide the theoretical underpinnings for the newly emerging information revolution in economics 1 today choice under uncertainty is a field in flux the standard theory is being challenged on several grounds from both within and outside economics the nature of these challenges and of our profession s responses to them is the topic of this paper

growth trends cyclical fluctuations and welfare with non expected utility preferences abstract using standard time separable discounted expected utility eu models lucas models of business cycles 1987 and others argue that growth trends have a crucial and cyclical fluctuations a trivial effect on individuals utility these conclusions are drastically altered if instead non eu preferences are assumed

the effect of medicaid abortion funding restrictions on abortions pregnancies and births this paper considers whether state medicaid abortion funding restrictions affect the likelihood of getting pregnant having an abortion and bearing a child we exploit a natural experiment afforded by supreme court decisions and employ more traditional multivariate models with alternative fixed effect specifications an analysis of 12 years of state level data indicate that restrictions are associated with a reduction in abortions and either no change or a reduction in births implying fewer pregnancies subsequent analysis of the national longitudinal survey of youth nlsy is consistent with these findings and show the response is concentrated among the low income population

temporal risk and the nature of induced preferences abstract it has been known since the work of h markowitz portfolio selection efficient diversification of investments yale univ press 1959 and j mossin amer econ rev 59 1969 172 174 that even an individual whose underlying preferences satisfy the von neumann morgenstern axioms will not choose over delayed i e temporal risky prospects in a manner which can be modelled as expected utility maximizing since most economically important instances of risk taking insurance real investment agriculture career training involve delayed as opposed to immediately resolved risk the standard use of expected utility theory to model such decisions must be questioned in this paper the technique of generalized expected utility analysis m j machina econometrica 50 1982 277 323 and the theory of support functions r t rockafellar convex analysis princeton univ press 1970 are applied to exactly model and hence determine the nature of preferences over temporal risky prospects

cost of business cycles with indivisibilities and liquidity constraints it is almost universally agreed that individuals face incomplete insurance markets and cannot perfectly insure against the idiosyncratic risk in this paper simple general equilibrium models with incomplete insurance markets are examined in order to assess the impact of imperfect insurance on the magnitude of the welfare costs of business cycles two versions of incomplete insurance markets are considered and certain statistical properties of the equilibrium stochastic processes in these environments are compared with those of a perfect insurance economy

are individuals bayesian decision makers there has been increasing interest in whether normative models of individual choice under uncertainty accord with actual behavior these concerns have been much greater than in other economic contexts because of the particularly severe demands such decisions place on the rationality of the decision maker the limitations of these decisions have widespread consequences as they provide the rationale for many governmental efforts to regulate the risks people face here i explore the issues raised by a bayesian decision framework focusing particularly on my analyses of worker and consumer behavior

on the welfare cost of economic fluctuations in developing countries macroeconomic fluctuations are much stronger in developing countries than in the united states yet while a large literature debates the welfare cost of economic fluctuations in the united states it remains an open question how large that cost is in developing countries using several models we provide such a measure we find that the welfare cost of consumption volatility per se is far from trivial and averages a substantial multiple of the corresponding u s estimate moreover in many poor countries the welfare gain from eliminating volatility may in fact exceed the welfare gain from an additional percentage point of growth forever

on the use of expectations data in estimating structural dynamic choice models despite the importance of expectations in models of decision behavior under uncertainty few empirical economists have made use of subjective expectations data in estimating such models assuming that expectations about future behavior accurately portray optimal future behavior conditional on current information it is shown that such data can provide similar information about the decision process as can data on current or retrospective behavior the value of self reported choice expectations is illustrated by using information on respondents expected future occupation in the estimation of a structural dynamic model of teacher career decisions under uncertainty

a new model for decisions under uncertainty abstract a representation for preferences between uncertain acts that is not unduly more complex than the ramsey savage model can simultaneously accomodate allais s paradox ellsberg s paradox preference reversals and cyclic preferences

the behavioral dynamics of youth smoking individual smoking behavior persists over time but the extent to which we can attribute this repeated behavior to past use or individual heterogeneity is not well understood to address this empirical question we develop a dynamic model of smoking decisions which explicitly accounts for the impact of endogenous previous smoking behavior and allows for observed and unobserved individual heterogeneity the model is estimated using longitudinal data on a representative sample of teens from all 50 united states from 1988 to 1992 we have two main findings first we show that there is a significant causal role for past cigarette consumption even after controlling extensively for observed and unobserved heterogeneity second we find measurable evidence of different sensitivities to cigarette price depending on past use these two findings suggest that a cigarette price increase will have a larger aggregate effect in the long run than in the short run as more individuals accumulate in the price sensitive non smoking group

the cost of business cycles under endogenous growth robert e lucas jr argued that the welfare gains from reducing aggregate consumption volatility are negligible subsequent work that revisited his calculation continued to find small welfare benefits further reinforcing the perception that business cycles do not matter this paper argues instead that fluctuations can affect welfare by affecting the growth rate of consumption i show that fluctuations can reduce growth starting from a given initial consumption which can imply substantial welfare effects as lucas himself observed empirical evidence suggests the welfare effects are likely to be substantial about two orders of magnitude greater than lucas original estimates

why do markets move together an investigation of u s japan stock return comovements this article explores the fundamental factors that affect cross country stock return correlations using transactions data from 1988 to 1992 we construct overnight and intraday returns for a portfolio of japanese stocks using their nyse traded american depository receipts adrs and a matched sample portfolio of u s stocks we find that u s macroeconomic announcements shocks to the yen dollar foreign exchange rate and treasury bill returns and industry effects have no measurable influence on u s and japanese return correlations however large shocks to broadbased market indices nikkei stock average and standard and poor s 500 stock index positively impact both the magnitude and persistence of the return correlations stock return cross country covariances play a key role in international finance changes in these covariances affect the volatility of portfolios and asset prices as these covariances increase one expects that a fewer domestic risks are internationally diversifiable so portfolio volatility increases b the risk premium on the world market portfolio increases 1 c the cost of capital increases for individual firms and d the domestic version of the capm becomes increasingly inadequate 2 despite the important economic consequences of changes in cross country covariances the determinants of the levels and dynamics of these covariances have been little studied from an academic

willingness to pay and compensation demanded experimental evidence of an unexpected disparity in measures of value aside from possible income effects measures of the maximum amounts people will pay to avoid a loss and the minimum compensation necessary for them to accept it are generally assumed to be equivalent unexpectedly wide variations between these sums however have been noted in survey responses to hypothetical options this paper reports the results of a series of experiments that confronted people with actual money payments and cash compensations the results indicate that the compensation measure of value seems to exceed significantly the willingness to pay measure which would appear to call into some question various rules of entitlement damage assessments and interpretations of indifference curves

first order risk aversion and the equity premium puzzle abstract this paper integrates yaari s dual theory of choice under uncertainty into a multiperiod context and examines its implications for the equity premium puzzle an important property of these preferences is that of first order risk aversion which implies in our model that the risk premium for a small gamble is proportional to the standard deviation rather than the variance since the standard deviation of the growth rate in aggregate consumption is considerably larger than its variance the model can generate both a small risk free rate and a moderate equity premium