the optimum markup when bidding with uncertain costs abstract the use of friedman s approach to bidding is examined in situations where the competitors all bid with the same markup and the same distribution of uncertainty in the cost estimate the optimum markup is found for different distributions of the cost estimates for different versions of the expected profit and for different formulae for the probability of winning it is shown that the different distributions and different methods have significant effects in some but not all cases the friedman method is reliable in some instances but may be harmful in others

approval of social security disability appeals analysis of judges decisions this article is an empirical analysis of decisions by judges regarding requests by individuals for disability benefits applicants for disability benefits who are twice denied through the normal process can appeal to one of the social security administration s administrative law judges who hold appointed positions the data for this study are taken from decisions made by approximately 1000 judges for cases heard from 2010 through 2012 using each judge as a unit of observation the data reveal the number of cases heard and the number of approvals granted we augmented the data with additional information on the presiding judge and with data from the state in which the court resides the purpose of the study is to determine whether a simple model can explain first the volume of decisions rendered at the judge level and second the proportion of approvals results indicate that the volume of decisions can be explained in part by the judge s recent record of leniency evidence also supports the hypothes

note on a conflict of assumptions in bidding models abstract a controversy over the most appropriate model for some bidding situations is examined it is shown that the models are based on four common assumptions and a fifth which depends on the bidding situation

the labor market four years into the crisis assessing structural explanations four years after the beginning of the great recession the labor market remains historically weak many observers have concluded that structural impediments to recovery bear some of the blame the author reviews such structural explanations but after analyzing u s data on unemployment and productivity he finds there is little evidence supporting these hypotheses he finds that the bulk of the evidence is more consistent with the hypothesis that continued poor performance is primarily attributable to shortfalls in the aggregate demand for labor

how financial incentives induce disability insurance recipients to return to work using a local randomized experiment that arises from a sharp discontinuity in disability insurance di policy in norway we provide transparent and credible identification of how financial incentives induce di recipients to return to work we find that many di recipients have considerable capacity to work that can be effectively induced by providing financial work incentives we further show that providing work incentives to di recipients may both increase their disposable income and reduce program costs our findings also suggest that targeted policies may be the most effective in encouraging di recipients to return to work

family welfare cultures strong intergenerational correlations in various types of welfare use have fuelled a long standing debate over whether welfare receipt in one generation causes welfare participation in the next generation some claim a causal relationship in welfare receipt across generations has created a culture in which welfare use reinforces itself through the family others argue the determinants of poverty or poor health are correlated across generations so that children s welfare participation is associated with but not caused by parental welfare receipt however there is little empirical evidence to sort out these claims in this paper we investigate the existence and importance of family welfare cultures in the context of norway s disability insurance di system to overcome the challenge of correlated unobservables across generations we take advantage of random assignment of judges to di applicants whose cases are initially denied some appeal judges are systematically more lenient which leads to random variation in the probability a parent will be allowed di using this exogenous variation we find strong evidence that welfare receipt in one generation causes welfare participation in the next generation when a parent is allowed di their adult child s participation over the next five years increases by 6 percentage points this effect grows over time rising to 12 percentage points after ten years while these findings are specific to our setting they serve to highlight that welfare reforms can have long lasting effects on program participation since any original effect on the current generation could be reinforced by changing the participation behavior of their children as well the detailed nature of our data allows us to compare the intergenerational transmission with spillover effects in other networks and to explore mechanisms our findings point to a special link between parents and their children with little impact due to close neighbors di participation we find suggestive evidence that what may change as a result of a parent being allowed di is their children s beliefs about the efficacy of trying to get on to the di program or their attitudes about di participation and its stigma

earnings inequality and mobility in the united states evidence from social security data since 1937 this paper uses social security administration longitudinal earnings micro data since 1937 to analyze the evolution of inequality and mobility in the united states annual earnings inequality is u shaped decreasing sharply up to 1953 and increasing steadily afterward short term earnings mobility measures are stable over the full period except for a temporary surge during world war ii virtually all of the increase in the variance in annual log earnings since 1970 is due to increase in the variance of permanent earnings as opposed to transitory earnings mobility at the top of the earnings distribution is stable and has not mitigated the dramatic increase in annual earnings concentration since the 1970s long term mobility among all workers has increased since the 1950s but has slightly declined among men the decrease in the gender earnings gap and the resulting substantial increase in upward mobility over a lifetime for women are the driving force behind the increase in long term mobility among all workers

the impact of medicaid on labor market activity and program participation evidence from the oregon health insurance experiment united states dept of health and human services assistant secretary for planning and evaluation

earnings losses of displaced workers revisited recent literature reviews conclude that job displacement results in sustained earnings losses bruce c fallick 1996 lori g kletzer 1998 and that estimates of the size of those reductions vary with the type of data used in the analysis the industry within which displacement occurs and business cycle conditions the largest estimated losses were obtained using administrative data from pennsylvania during the 1970s and 1980s louis s jacobson robert j lalonde and daniel g sullivan 1993a the data covered a period of high unemployment in a heavily indus trialized state characterized by disproportionate job losses in manufacturing thus the ability to generalize those results to more favorable economic times and states with a greater reliance on service sector employment has been questioned to address these issues administrative data are used to similarly examine the impact of job displacement on earnings losses of workers in connecticut from 1993 to 2004 the work of jacobson lalonde and sullivan jls also provided important methodologi cal advancement by adapting analytical techniques developed for program evaluation james j heckman and v joseph hotz 1989 to the context of job displacement the same techniques fixed effects and time trend estimators as those used in the original jls publication are initially employed here then the methods are extended to include matching estimators developed since their publication both nearest neighbor estimators of average treatment on the treated att and differenced average treatment on the treated datt are adapted to the context of this study heckman hidehiko ichimura and petra todd 1997 heckman et al 1998 and rajeev h dehejia and sadek wahba 1999 2002 the results presented here for connecticut differ in some ways from those found in the work of jls using data from pennsylvania in the period immediately following job loss regardless of the technique employed earnings reductions for workers displaced through mass layoff range from 32 percent to 33 percent jls reported immediate losses of more than 40 percent six years later using the same estimators as jls earnings reductions in connecticut range from 13 percent to 15 percent they report sustained losses in pennsylvania of 25 percent the smaller long term impacts in connecticut demonstrate that under more ordinary economic times esti mated losses from administrative data lie within the range observed using other data sources this finding resolves a long standing conflict among the results of high quality studies that have used differing data sources to study earnings reductions following job loss 1 using two different matching estimators earnings losses six years after mass layoff are 12 percent the matching estimators compare those who experienced mass layoff to compari sons with the same ex ante probability of the event these smaller losses are consistent with the

the rise in the disability rolls and the decline in unemployment between 1984 and 2001 the share of nonelderly adults receiving social security disability insurance income di rose by 60 percent to 5 3 million beneficiaries rapid program growth despite improving aggregate health appears to be explained by reduced screening stringency declining demand for less skilled workers and an unforeseen increase in the earnings replacement rate we estimate that the sum of these forces doubled the labor force exit propensity of displaced high school dropouts after 1984 lowering measured u s unemployment by one half a percentage point steady state calculations augur a further 40 percent increase in the rate of di receipt

optimal bidding in auctions of mixed populations of bidders abstract a mixed population of bidders consists of two asymmetric groups members of the first group are game theoretic players who maximize their expected profit and incorrectly believe that their opponents act similarly the second group of bidders adopts an irrational strategy they either choose their bids randomly following a given probability distribution in a naive form of bidding or follow a decision theoretic approach maximizing their expected profit under the assumption that all other bids are random in a sealed bid private value procurement auction we examine the optimal strategy of a new player who has perfect knowledge of the structure of the mixed bidder population and enters the auction the optimal bid of the new bidder is derived when the cost and mark up follow a uniform distribution in 0 1 the effect of the relative size of the group of game theoretic bidders and the population size on the optimal bid price is established

employment time and the cyclicality of earnings growth abstract we study how the distribution of earnings growth evolves over the business cycle in italy we distinguish between two sources of annual earnings growth changes in employment time number of weeks of employment within a year and changes in weekly earnings changes in employment time generate the tails of the earnings growth distribution and account for its procyclical skewness in contrast the distribution of weekly earnings growth is close to symmetric and stable over the cycle this suggests that studies of earnings risk should carefully model the employment margin to avoid erroneous conclusions on the nature and magnitude of risks underlying individual earnings we show that the combination of simple employment and wage processes is enough to capture the complex features of the earnings growth distribution

the growth in the social security disability rolls a fiscal crisis unfolding the u s social security disability insurance di program has grown dramatically over the last 20 years in size and expense this growth poses significant risks to the finances of the di program and the broader social security system and raises troubling questions as to whether the program is being misused by claimants this article first provides an overview of the disability insurance program describing who qualifies for the program how an individual applies for benefits and how the level of benefits is determined next we summarize the factors responsible for the growth in the di rolls and discuss how the characteristics of di recipients have changed as a result we then explore the extent of moral hazard in the di program and the effectiveness of the screening process in distinguishing meritorious from nonmeritorious claims finally we identify the challenges that the di program creates for social security finances and social security reform and discuss potential reforms to the di program

the health and earnings of rejected disability insurance applicants applicants for social security disability benefits who fail to pass the medical screening form a natural control group for beneficiaries data drawn from the 1972 and 1978 surveys of the disabled done for the social security administration show that fewer than 50 percent of rejected male applicants work typical earnings of those that do are less than 59 percent of median earnings for other men their age these data cast doubt on recent econometric work that suggests that the disincentive effects of the social security disability program have been substantial copyright 1989 by american economic association

the case for presenteeism evidence from norway s sickness insurance program can a work first strategy control moral hazard problems in temporary disability insurance and accelerate recovery based on empirical analysis of norwegian data we show that it can activation requirements not only bring down benefit claims they also reduce the likelihood that long term sickness absence leads to inactivity our findings show that absentees who are assigned graded partial absence certificates by their physician have shorter absences and higher subsequent employment rates than they would have had on regular sick leave we conclude that the activation strategies that in recent years have permeated european and us welfare policy may fruitfully be carried over to sick leave insurance for temporary disabled workers

disability earnings income and consumption using longitudinal data for the period 1968 2005 for a sample of male household heads we determine the prevalence of disability during the working years and examine how the extent of disability affects a range of outcomes including earnings income and consumption we have seven main findings first disability rates are high we divide the disabled along two dimensions based on the persistence and severity of their work limiting condition we estimate that a person reaching age 56 has a 53 percent chance of having been disabled at least once during his working years and a 19 percent chance that he has begun a chronic and severe disability second the economic consequences of disability are frequently profound ten years after disability onset a person with a chronic and severe disability on average experiences a 68 percent decline in earnings a 32 percent decline in after tax income a 22 percent decline in food and housing consumption and a 21 percent decline in food consumption third the various economic consequences differ sharply across disability groups the outcome declines for those with a chronic and severe disability are often more than twice as large as those for the average disabled fourth our findings show the partial and incomplete roles that individual savings family support and social insurance play in reducing the consumption drop that follows disability only about half of this most disabled group reports receiving social security disability insurance or supplemental security income fifth we find a noticeable fall in earnings and income prior to the onset of a reported disability consumption also falls somewhat suggesting that future disability is partially but incompletely predictable in the short run sixth time use and detailed consumption data further indicate that disability is associated with a decline in well being seventh the quantities we have estimated combined with elasticities from the literature allow us to examine the optimality of current compensation for the disabled we find that the current compensation for our most disabled group appears to be lower than is optimal

trends in employment and earnings of allowed and rejected applicants to the social security disability insurance program since the early 1980s changes in the economic environment and in the process for determining eligibility for the social security disability insurance di program have had significant effects on the program first the economic situation and labor force opportunities for lower skilled people continued to decline leading to lower rates of participation in the labor force for less educated men second changes in the eligibility process made it easier to obtain di benefits based on conditions difficult to clearly identify on medical terms alone such as back pain or depression 1 those two factors have likely contributed to a substantial increase in the number of individuals receiving di as well as a significant change in the characteristics of applicants and new beneficiaries over the same period both applicants and new beneficiaries have become younger longer lived more likely to apply because of nonterminal conditions such as back pain or mental health and more likely to be female 2 as a result recent work projects a rapid increase in program costs as greater numbers of beneficiaries stay on the program for more years e g david h autor and duggan 2006 the concurrent developments in the economy and eligibility rules have also fueled the concern that the generosity of di increasingly induces low income workers to apply for and sometimes receive benefits and that some of those beneficiaries would be able to work in the absence of the program indeed a growing body of research suggests that some workers in difficult economic conditions exit the labor force to

differences in bidding strategies abstract methodological understanding is increased and the appreciation of discernible competitive bidding strategies widened by investigating the problems of two construction companies one being a kitchen equipment manufacturer and the other a civil engineering contractor detailed strategies are estimated for the former but not for the latter due primarily to the greater uncertainty in cost estimates for civil engineering contracts producing larger variability in outcomes

explaining social policy preferences evidence from the great recession to what extent do personal circumstances as compared to ideological dispositions drive voters preferences on welfare policy addressing this question is difficult because a person s ideological position can be an outcome of material interest rather than an independent source of preferences the article deals with this empirical challenge using an original panel study carried out over four years tracking the labor market experiences and the political attitudes of a national sample of americans before and after the eruption of the financial crisis the analysis shows that the personal experience of economic hardship particularly the loss of a job had a major effect on increasing support for welfare spending this effect was appreciably larger among republicans than among democrats a result that was not simply due to a ceiling effect however the large attitudinal shift was short lived dissipating as individuals employment situations improved the results indicate that the personal experience of an economic shock has a sizable yet overall transient effect on voters social policy preferences

income and substitution effects of a disability insurance reform abstract disability insurance di systems are widely criticized for their inherent work disincentives this paper evaluates the effects of a swiss di reform that aims to lower di benefits for a group of existing di beneficiaries and introduces an additional level to the di benefit schedule the reform has only modest effects on earnings and employment but increases the disability degree of those threatened by a di benefit decline we estimate bounds on the income and substitution effects by employing the principal stratification framework the income effect is quantitatively important whereas the substitution effect is smaller and has bounds that include zero the evidence suggests that caseworkers helped the insured with low labor market attachment to maintain a full di benefit

the long run impact of cash transfers to poor families lleras muney we estimate the long run impact of cash transfers to poor families on children s longevity educational attainment nutritional status and income in adulthood to do so we collected individual level administrative records of applicants to the mothers pension program the first government sponsored welfare program in the united states 1911 1935 and matched them to census wwii and death records male children of accepted applicants lived one year longer than those of rejected mothers they also obtained onethird more years of schooling were less likely to be underweight and had higher income in adulthood than children of rejected mothers jel i12 i14 i18 i32 i38 j16 n32

the longitudinal structure of earnings losses among work limited disabled workers this paper asks what are the dynamic effects of disability on earnings unlike most of the previous literature it uses panel data and fixed effects methods are used to assess how the earnings of disabled workers depart from expected levels over many years before and after the date of onset of their disability the paper also examines how worker characteristics affect earnings losses from disability with particular attention paid to the age at which the person suffers onset disabled men are found to experience sharp drops in earnings that predate the measured date of onset earnings recover rapidly soon after onset with much of the immediate reduction made up in the first two post onset years a modest downward trendfollows resulting in significant long term losses in expected annual earnings of about 12 percent per year being older at onset nonwhite more chronically disabled and less educated cause the losses from disability to be larger and the recovery smaller a large portion of these differences across groups appear to derive from industry affiliation after onset the paper argues the facts are all consistent with a simple human capital explanation of the disability process

how do patents affect follow on innovation evidence from the human genome we investigate whether patents on human genes have affected follow on scientific research and product development using administrative data on successful and unsuccessful patent applications submitted to the us patent and trademark office we link the exact gene sequences claimed in each application with data measuring follow on scientific research and commercial investments using this data we document novel evidence of selection into patenting patented genes appear more valuable prior to being patented than non patented genes this evidence of selection motivates two quasi experimental approaches both of which suggest that on average gene patents have had no quantitatively important effect on follow on innovation

does disability insurance receipt discourage work using examiner assignment to estimate causal effects of ssdi receipt abstract we present the first causal estimates of the effect of social security disability insurance benefit receipt on labor supply using all program applicants we use administrative data to matc

how do unemployment insurance benefits affect the decision to apply for social security disability insurance this paper examines whether unemployment insurance ui benefits affect the decision to apply for social security disability insurance di using data from the survey of income and benefits matched to administrative records on di applications i find that higher ui benefits reduce applications for di this substitution effect is imprecisely estimated but economically significant implying that a 1 00 increase in ui benefits reduces di expenditures by 15 cents recognizing this cost saving effect would increase the optimal ui benefit level by more than 20 percent for coefficients of relative risk aversion ranging from two to five

disability insurance and the dynamics of the incentive insurance trade off we provide a life cycle framework for comparing insurance and disincentive effects of disability benefits the risks that individuals face and the parameters of the disability insurance di program are estimated from consumption health disability insurance and wage data we characterize the effects of disability insurance and study how policy reforms impact behavior and welfare di features high rejection rates of disabled applicants and some acceptance of healthy applicants despite worse incentives welfare increases as programs become less strict or generosity increases disability insurance interacts with welfare programs making unconditional means tested programs more generous improves disability insurance targeting and increases welfare

unemployment insurance and disability insurance in the great recession social security disability insurance ssdi awards rise during recessions if marginal applicants are able to work but unable to find jobs countercyclical unemployment insurance ui benefit extensions may reduce ssdi uptake exploiting ui extensions in the great recession as a source of variation we find no indication that expiration of ui benefits causes ssdi applications and can rule out effects of meaningful magnitude a supplementary analysis finds little overlap between the two programs recipient populations only 28 of ssdi awardees had any labor force attachment in the prior calendar year and of those only 4 received ui

the impact of economic conditions on participation in disability programs evidence from the coal boom and bust abstract we examine the impact of the coal boom of the 1970 s and the coal bust of the 1980 s on disability program participation these shocks provide clear evidence that as the value of labor market participation increases disability program participation falls for the disability insurance program the elasticity of payments with respect to local earnings is between 0 3 and 0 4 and for supplemental security income the elasticity is between 0 4 and 0 7 consistent with a model where qualifying for disability programs is costly the relationship between economic conditions and program participation is much stronger for permanent than for transitory economic shocks

does welfare inhibit success the long term effects of removing low income youth from the disability rolls i estimate the effects of removing low income youth with disabilities from supplemental security income ssi on their earnings and income in adulthood using a regression discontinuity design based on a 1996 policy change in age 18 medical reviews i find that youth who are removed from ssi at age 18 recover one third of the lost ssi cash income in earnings ssi youth who are removed and stay off ssi earn on average 4 400 annually and they lose 76 000 in present discounted observed income over the 16 years following removal relative to those who do not receive a review jel i30 i38 j14 supporters of welfare programs defend them as vital lifelines for those who face barriers to work while critics charge that these programs create perverse incentives to qualify and perpetuate dependency encapsulating this debate is the controversy over the us supplemental security income ssi program a program that provides cash payments and medicaid eligibility to low income children and adults with disabilities and the aged elderly after three decades of rapid expansion ssi is now the largest nonwork based cash welfare program in the united states paying about 50 billion each year to 8 million recipients including 1 3 million children 1 ssi has been singled out by policymakers and the media for potential perverse incentives

the employment effects of terminating disability benefits abstract few social security disability insurance di beneficiaries return to the labor force making it hard to assess their likely employment in the absence of benefits using administrative data i examine the employment of individuals who lost di eligibility after the 1996 removal of drug and alcohol addictions as qualifying conditions approximately 22 started working at levels that would have disqualified them for di an employment response that is large relative to their work histories those who received di for 2 3 years had the largest response suggesting that a period of public assistance may maximize the employment of some disabled individuals

touched by tragedy capital market lessons from the crash of valujet flight 592 abstract this study presents an event time analysis of the effects of the crash of valuejet flight 592 the mandated f a a shutdown of valujet and the subsequent restart of the airline on valujet shareholders and two portfolios composed of the stocks of major and low cost competitors the results of the study document immense losses for valujet s shareholders as well as large contagion losses for the holders of other low cost airlines but statistically significant gains for the owners of major airline stocks a cross sectional analysis of the abnormal returns registered at the time of the crash and shutdown suggests that fleet age and low cost status but not an airline s public safety record were significant of the determinants changes in share prices for competitor firms

asset accumulation and labor force participation of disability insurance applicants abstract this paper provides empirical evidence of the existence of forward looking asset accumulation behavior among disability insurance applicants previously examined only in the theoretical literature using panel data from the rand health and retirement study i show that rejected applicants for social security disability insurance ssdi possess significantly more assets than accepted applicants immediately prior to application and exhibit lower attachment to the labor force these empirical results are consistent with the theoretical prediction in diamond and mirrlees 1978 and golosov and tsyvinski 2006 that certain individuals with high unwillingness to work maximize utility by planning in advance for their future disability insurance application because the existing empirical literature on disability insurance does not account for this intertemporal channel it may underestimate the total work disincentive effect of ssdi

the more things change the more they stay the same the safety net and poverty in the great recession much attention has been given to the large increases in safety net spending during the great recession we examine the relationship between poverty the safety net and business cycles historically and test whether there has been a significant change in this relationship we find that post welfare reform temporary assistance for needy families did not respond during the great recession and extreme poverty is more cyclical than in prior recessions food stamps and unemployment insurance are providing more protection or no less protection in the great recession and there is some evidence of less cyclicality for 100 poverty