many instruments and or regressors a friendly guide this paper surveys the state of the art in the econometrics of regression models with many instruments or many regressors based on alternative namely dimension asymptotics we list critical results of dimension asymptotics that lead to better approximations of properties of familiar and alternative estimators and tests when the instruments and or regressors are numerous then we consider the problem of estimation and inference in the basic linear instrumental variables regression setup with many strong instruments we describe the failures of conventional estimation and inference as well as alternative tools that restore consistency and validity we then add various other features to the basic model such as heteroskedasticity instrument weakness etc in each case providing a review of the existing tools for proper estimation and inference subsequently we consider a related but different problem of estimation and testing in a linear mean regression with many regressors we also describe various extensions and connections to other settings such as panel data models spatial models time series models and so on finally we provide practical guidance regarding which tools are most suitable to use in various situations when many instruments and or regressors turn out to be an issue

how large are search frictions textabstractthis paper presents strong evidence for the concavity of wages in job and worker characteristics by adding second order terms to a mincerian earnings function for 6 oecd countries under a standard normality assumption this concavity cannot be attributed to unobserved components in those characteristics an assignment model with search frictions provides a parsimonious explanation for our findings this model yields two restrictions on the coefficients which fit the data very well the impact of search frictions on wages is large our results relate to the literature on industry wage differentials on structural identification in hedonic models and on wage posting versus nash bargaining in search models

education and health in europe abstractthe productive and allocative theories predict that education has positive impact on health the more educated adopt healthier life styles and use more efficiently health inputs and this explains why they live longer we find partial support for these theories with an econometric analysis on a large sample of europeans aged above 50 documenting a significant and positive correlation among education years life styles health outputs and functionalities we however find confirmation for an anomaly already observed in the united states namely the more educated are more likely to contract cancer our results are robust when controlling for endogeneity and reverse causality in iv estimates with instrumental variables related to quarter of birth and neighbours cultural norms

an experimental investigation of the patterns of international trade this study is the first attempt to create and study a laboratory economy with some of the prominent features of an international economic system the concept of multiple countries in which each country has its own technology preferences and resource endowments is introduced and operationalized the questions posed in the study are related to the law of comparative advantage factor price equalization terms of trade efficiency in production and exchange as guided by multiple and interacting markets and the effects of tariffs on international transactions the study builds on previous work in the experimental study of general equilibrium phenomena

returns to foreign languages of native workers in the european union most of the literature on returns to languages is concerned with immigrants the authors study which uses the european community household panel survey for the period 1994 2001 infers returns to non native languages by native workers in nine countries of the european union the study differs from other studies that deal with the same issue in three respects first instead of using a dummy for each language they use the ratio of the population not proficient in a given country s national language and compare the results with the more traditional approach using dummies second they correct for time independent measurement errors in self reporting and find that the resulting iv estimates are much larger than those obtained by ols they also suggest that there is little room for time persistent errors and heterogeneity and that therefore their estimates should suffer ostensibly little from unobserved ability biases finally they estimate iv quantile regressions to illustrate how returns to languages vary at different points of the distribution of earnings

the effect of female education on fertility and infant health evidence from school entry policies using exact date of birth this paper uses age at school entry policies to identify the effect of female education on fertility and infant health we focus on sharp contrasts in schooling fertility and infant health between women born just before and after the school entry date school entry policies affect female education and the quality of a woman s mate and have generally small but possibly heterogeneous effects on fertility and infant health we argue that school entry policies manipulate primarily the education of young women at risk of dropping out of school

the effect of education on religion evidence from compulsory schooling laws abstract for over a century social scientists have debated how educational attainment impacts religious belief in this paper i use canadian compulsory schooling laws to identify the relationship between completed schooling and later religiosity i find that higher levels of education lead to lower levels of religious affiliation later in life an additional year of education leads to a 4 percentage point decline in the likelihood that an individual identifies with any religious tradition this is a reasonably large effect extrapolating the results to the broader population would suggest that increases in schooling could explain most of the large rise in non affiliation in canada in recent decades

data improvement and labor economics the expansion of available data for research has transformed empirical labor economics over the past generation this paper briefly highlights some of the changes and describes a few examples of papers that illustrate the advances it also documents the changing ways data have been used in the journal of labor economics over the past 30 years including a trend toward a higher fraction of papers using any data and among those papers using any data a higher fraction using nonpublic data a higher fraction using international data and more frequent use of multiple data sources finally this paper describes work that came out of the recent princeton data improvement initiative a program that considers and furthers improved data collection

child labor and the labor supply of other household members evidence from 1920 america this paper analyses the effect of child labor on household labor supply using 1920 us census micro data the aim of the analysis is to understand who in the household benefits from child labor in order to identify a source of exogenous variation in child labor i use state specific child labor laws i find that a rise in the proportion of working children by household is associated with no variation in parents labor supply i also find a strong negative externality among children as the proportion of working children by household rises everything else equal the probability that each child works falls while the probability that he attends school rises this suggests that parents redistribute entirely the returns from child labor to the children in the household consistent with a model of household labor supply with fully altruistic parents

earnings functions when wages and prices vary by location economists generally assume implicitly that the return to schooling is invariant across local labor markets we demonstrate that this outcome pertains if and only if preferences are homothetic a special case that seems unlikely our theory predicts that returns to education will instead be relatively low in expensive high amenity locations our analysis of u s data provides support for this contention returns to college are especially low in such cities as san francisco and seattle our findings call into question standard empirical exercises in labor economics that treat the returns to education as a single parameter

does early child care affect children s development we study how early child care ecc affects children s development in a marginal treatment effect framework that allows for rich forms of observed and unobserved effect heterogeneity exploiting a reform in germany that induced school districts to expand ecc at different points in time we find strong but diverging effects on children s motor and socio emotional skills children who were most likely to attend ecc benefit in terms of their motor skill development children who were least likely to attend ecc gain in terms of their socio emotional skill development especially boys and children from disadvantaged families such as those with low education or migration backgrounds simulating expansions of ecc we find that a moderate expansion fosters motor skills for all children and language skills for boys and immigrant children a progressive expansion of ecc improves all children s socio emotional development but neither their motor skills nor their language skills

programme evaluation with multiple treatments this paper reviews the main identification and estimation strategies for microeconometric policy evaluation particular emphasis is laid on evaluating policies consisting of multiple programmes which is of high relevance in practice for example active labour market policies may consist of different training programmes employment programmes and wage subsidies similarly sickness rehabilitation policies often offer different vocational as well as non vocational rehabilitation measures first the main identification strategies control for confounding variables difference in difference instrumental variable and regression discontinuity identification are discussed in the multiple programme setting thereafter the different nonparametric matching and weighting estimators of the average treatment effects and their properties are examined download discussion paper pdf 484 kb

the estimation of human capital by administrative archives in a static and longitudinal perspective the case of milan this paper focuses on the estimation of the latent variable human capital hc at disaggregated level worker by available routinely institutional data flows in particular we utilize the lombardy region administrative archive employment centers of the province of milan collecting information about careers of workers in the private sector of the milan area and administrative flows collecting mandatory workers individual income tax returns filed with the national internal revenue service first we propose and empirically estimate hc scores in a static referred to 2004 framework by means of a realistic measurement model within causal relationships among endogenous and exogenous investment hc indicators furthermore the model also specifies a set of concomitant indicators that not belonging to hc investment indicators have causal impact on endogenous variables and on hc scores too second we propose a longitudinal analysis period 2000 2004 aimed to investigate how workers earned income growth rates vary over workers educational levels and other personal characteristics the empirical results of both analyses confirm the characteristics of the italian job market denoted by marked inequalities and knowledge regarding the process of school to work transition characterized by a weak incidence of education on longitudinal trajectories of earned income

monotone instrumental variables with an application to the returns to schooling for fifty years econometric analyses of treatment response have made extensive use of instrumental variable iv assumptions holding that mean response is constant across specified subpopulations of a population of interest 2 yet the credibility of mean independence conditions and other iv assumptions has often been a matter of considerable disagreement with much debate about whether some covariate is or is not a valid instrument in an application of interest there is therefore good reason to consider weaker but more credible assumptions to this end we introduce monotone instlumental variable miv assumptions holding that mean response varies weakly monotonically across specified subpopulations we study the identifying power of these miv assumptions and give an empirical application the findings reported here add to the literature developing nonparametric bounds on treatment effects 3 this paper uses the same formal setup as manski 1997 there is a probability space j x2 p of individuals each member j of population j has observable covariates xi e x and a response function yj t y mapping the mutually exclusive and exhaustive treatments t e t into outcomes yj t e y person j has a realized treatment zj e t and a realized outcome y 1 y zi both of which are observable the latent outcomes yj t

does education improve citizenship evidence from the united states and the united kingdom abstract many studies document an association between schooling and civic participation but none credibly investigate causal links we explore the effect of extra schooling induced through compulsory schooling laws on the likelihood of becoming politically involved in the united states and the united kingdom we find that educational attainment is related to several measures of political interest and involvement in both countries we find a strong and robust relationship between education and voting for the united states but not for the united kingdom our us results approach the uk findings when conditioning on registration possibly indicating that registration rules present a barrier to participation

education s role in china s structural transformation abstract we explore education s role in improving the allocation of labor between china s agricultural and nonagricultural sectors and measure the portion of china s recent growth attributable to this channel using detailed micro level data and an empirical model that allows for the endogenous selection of education and sector of employment we estimate the relationship between an individual s educational attainment sector and income we find that about 11 of aggregate growth in output per worker from 1978 to 2004 is accounted for by increased education with 9 coming through the labor reallocation channel and 2 attributable to increased within sector human capital

child labor cause consequence and cure with remarks on international labor standards although the literature on child labor is enormous it lacks a common theoretical foundation in this paper analytical survey of this field is provided keeping in mind that this is an area where the primary reason for theorizing is ultimately to influence policy overall it is noted that the literature on child labor is an illustration of abundance and anarchy although empirical writings on child labor are numerous they are not usually founded on theory it is argued that there is much that can be done in curbing the issue of child labor several theories were studied in this paper including collaborative intervention such efforts include public action which alters the economic environment such that the parents of their own accord prefer to withdraw the child from labor force another strategy involves the government a legal intervention is enforcing a total ban on the subject although such interventions have good intentions some of them may not be feasible in general it is better to take economy wide measures against child labor and if there is to be a sector specific ban it should be based on the working conditions of that sector rather than the destination of the goods

is there a wage premium for volunteer oss engagement signalling learning and noise abstractvolunteer based open source production has become a significant new model for the organization of software development economics often pictures this phenomenon as a case of signalling individuals engage in the volunteer programming of open source software oss as a labour market signal resulting in a wage premium yet this explanation could so far not be empirically tested this article fills this gap by estimating an upper bound composite wage premium of voluntary oss contributions and by separating the potential signalling effect of oss engagement from other effects although some 70 of oss contributors believe that oss involvement benefits their careers we find no actual labour market premium for oss engagement the presence of other motives such as fun of play or altruism renders oss contributions too noisy to function as a signal

does education increase pro environmental behavior evidence from europe abstract it is often observed that individuals with higher education levels tend to be more environmentally friendly yet the causal evidence is lacking because there may well be omitted variables that cause individuals to attain more education and also cause individuals to be environmentally conscious we implement a regression discontinuity design to estimate the increase in educational attainment due to changes in compulsory education laws in 20th century europe this allows us to overcome the identification problem of endogenous educational attainment using two waves of eurobarometer surveys we find a positive local average treatment effect for 7 of the 8 pro environmental behaviors an analysis of related questions on the survey supports the notion that education causes individuals to be more concerned with social welfare and to accordingly behave in a more environmentally friendly manner

financial development and pathways of growth state branching and deposit insurance laws in the united states 1900 1940 abstract this paper studies the effect of state level banking regulation on financial development and on components of state level growth in the united states from 1900 to 1940 we use these banking laws to assess the findings of a large recent literature that has argued that financial development contributes to economic growth we contend that the institutional mechanism leading to financial development is important in determining its consequences and that some types of financial development can even retard economic growth for the united states from 1900 to 1940 we argue that the financial expansion induced by expanded bank branching accelerated the mechanization of agriculture and spurred growth in manufacturing in contrast financial expansions induced by state deposit insurance had negative consequences for both the agricultural and manufacturing sectors

schooling and citizenship in a young democracy evidence from postwar germany this paper examines whether schooling has a causal impact on individuals political interest voting turnout democratic values political involvement and political membership using two national representative samples between 1949 and 1969 the number of compulsory years of schooling was increased from eight to nine years in the federal republic of germany gradually over time and across federal states these legislative changes allow one to investigate the causal impact of years of schooling on citizenship in a young democracy years of schooling are found to be positively correlated with a broad range of citizenship outcomes however when exogenous increase in schooling through legislative changes is used there is little evidence of a causal efiect several potential explanations are examined 1 poor or apolitical teaching practices in the post war period 2 shortages of qualifled teachers and adequate teaching material 3 extra curricular civic education and 4 whether civic knowledge might have been acquired prior to the increase in schooling the estimates reject the flrst three explanations whereas ample historical evidence is in favour of the hypothesis that the fundamentals of democracy were learned already earlier in school

teachers pay for performance in the long run the dynamic pattern of treatment effects on students educational and labour market outcomes in adulthood this paper examines the dynamic effects of a teachers pay for performance experiment on long term outcomes at adulthood the program led to a gradual increase in university education of the treated high school students reaching an increase of 0 25 years of schooling by age 28 30 the effects on employment and earnings were initially negative coinciding with a higher rate of enrollment in university but became positive and significant with time these gains are largely mediated by the positive effect of the program on several high school outcomes including quantitative and qualitative gains in the high stakes matriculation exams

pursuing the wrong options adjustment costs and the relationship between uncertainty and capital accumulation abel and eberly 1999 prove that uncertainty has an ambiguous effect on long run capital accumulation in a real options model we show that with adjustment costs quadratic in investment more uncertainty reduces capital and this effect may be large

astronomics in action the graduate earnings premium and the dragon effect in singapore white u s and latin american currencies portray images of national independence heroes singapore s 2 dollar bill the most widely circulated since there is no smaller denomination shows students in a classroom listening to a professor with a university in the background underneath there is just one word education singapore s obsession with education miami herald 8 september 2009 i introduction since the groundbreaking work of mincer 1974 many academics have looked closely at the question of what the return to education might be 1 however because of the lack of data the literature does not have much to say about singapore even though a lot of research has been done for advanced countries throughout the world 2 3 in this paper we employ a recent survey from the singapore national youth council to study one aspect of this topic the return to university education in singapore having a university education is usually perceived to be good for one s career although the extent to which this is true has been a constant point of contention 4 this debate had relied largely on anecdotes instead of econometric research understandably so because data is not easily available therefore this paper hopes to offer some evidence on the causal link between university education and earnings outcome in singapore however identification is a formidable challenge as in any research that aims to estimate the return to education although the positive association between education and earnings is a virtually ubiquitous fact prima facie evidence of income gaps may misrepresent what the true return to education is because individuals tend to make educational choices according to their abilities such income gaps would contain not only the return that is due to education the quantity of interest but also the return on unobserved abilities which is the confounding effect over the years economists have sought to disentangle the causal effect of education from the confounding effect of unobserved abilities in the data but the existing estimation approaches are not easily adaptable here for example methods that employ within twin comparisons or changes in compulsory schooling laws cannot be implemented owing to data limitations and the lack of important schooling reforms in singapore 5 in fact the dataset used here was compiled for a different purpose than economics which is to provide a better understanding of singapore s youths from a sociological perspective given these issues a new estimation approach has to be considered in this paper we propose to exploit a consequence li liu and zhang 2012 of chinese traditions generating the so called dragon effect to study the causal link between university education and income in singapore chinese is the largest ethnic group and malays indians and eurasians are the main ethnic minorities according to chinese traditions there are 12 creatures in the chinese zodiac where each represents a lunar year in a 12 year cycle among them the dragon is the most auspicious creature and babies born in a dragon year are believed to be superior 6 because of this conviction the dragon year has seen upswings in the rate of birth not just in singapore but also in places where chinese culture is prevalent 7 for example figure 1 plots the birth rate from 1970 in singapore based on resident women aged between 15 and 49 8 while the fertility rate was plunging early on it did increase momentarily during the dragon year of 1976 there was another sharp increase in 1988 9 and then in 2000 which marks the highly auspicious year of the golden dragon figure 1 omitted the positive relationship between the birth rate and the dragon year provides the rationale behind the identification strategy used here as the dragon cohort is larger than usual competition for entry into university would be more intense leading to what is known as the dragon effect

the effects of compulsory schooling on growth income distribution and welfare abstract in this paper we consider an olg model with productive capital and human capital affecting the quality of labor in each generation parents invest in their children s education but disregard its external effect on the aggregate production function government intervention in providing compulsory schooling increases economic growth along the equilibrium path while the intragenerational income distribution becomes more equal also in the long run the majority of individuals in each generation are better off due to compulsory schooling

education human capital and growth a personal perspective this article reviews the literature on the relationship of economic growth to the education levels of the labor force the emphasis is on yoram ben porath s contribution to some of the issues in this field the endogeneity of schooling the role of the public sector as an absorber of educated labor and the importance of personal human capital created by investments in reputation and personal relationships the f connection

jump starting self employment evidence among welfare participants in argentina one important concern of governments in developing countries is how to phase out large safety net programs the authors evaluate the short run effects of one possible exit strategy programs that promote self employment in argentina they provide evidence that a small fraction of beneficiaries were attracted by this program overall potential participants to self employment are more likely to be female household heads and more educated beneficiaries relative to the average jefes beneficiaries using nonexperimental methods the authors show that participation in the program does affect the labor supply of participants by reducing the probability of having an outside job especially for males and increasing the total number of hours worked but the intervention fails to produce on average income gains to participating individuals and households in the short run the fact that a small subset of former welfare beneficiaries are attracted to the program coupled with the fact that only a subset of participants younger and more educated beneficiaries and with previous self employment experience benefited from participation has important implications for this intervention to represent a viable exit strategy from welfare

public schooling college subsidies and growth abstract how does the mix of public education expenditures across primary and secondary k 12 education and post secondary college education influence economic growth to address this i build an overlapping generations endogenous growth model human capital is accumulated through compulsory k 12 education and through optional college education government uses tax revenue to provide quality in k 12 schooling and to subsidize college tuition when total expenditures are small all funds should provide k 12 quality when expenditures are above a critical value a positive share should subsidize tuition the share should increase with total expenditures and with the degree of complementarity of human capital accumulated through the two types of education also increased education spending is more likely to increase growth when a larger share subsidizes tuition

lessons from the bell curve this paper examines the argument presented in the bell curve a central argument is that one factor g accounts for correlation across test scores and performance in society another central argument is that g cannot be manipulated these arguments are combined to claim that social policies designed to improve social performance cannot be effective a reanalysis of the evidence contradicts this story the factors that explain wages receive different weights than the factors that explain test scores more than g is required to explain either other factors besides g contribute to social performance and they can be manipulated

on the use of instrumental variables in accounting research abstract instrumental variable iv methods are commonly used in accounting research e g earnings management corporate governance executive compensation and disclosure research when the regressor variables are endogenous while iv estimation is the standard textbook solution to mitigating endogeneity problems the appropriateness of iv methods in typical accounting research settings is not obvious drawing on recent advances in statistics and econometrics we identify conditions under which iv methods are preferred to ols estimates and propose a series of tests for research studies employing iv methods we illustrate these ideas by examining the relation between corporate disclosure and the cost of capital

the effects of financial education in the workplace evidence from a survey of households abstract we use a novel household survey to investigate the effects of employer based financial education on personal saving we explore cross sectional relations between the availability of employer based financial education and various measures of asset accumulation and we interpret these patterns in light of various potentially confounding factors our findings favor the hypothesis that employer based financial education stimulates saving both in general and for retirement

compulsory schooling laws and school crime extensive literature demonstrates that compulsory schooling laws improve educational attainment well being civic involvement and labour market outcomes however at risk youth incapacitated to schools may impact the learning environment and school safety the purpose of this article is to study whether raising the minimum dropout age mda requirement above 16 increases crime committed within us public high schools a difference in difference estimation exploits changes in state level mda laws over time and indicates that schools in states that raise their mda requirement to 18 incur more overall crime relative to schools in states that do not while no effect on overall crime is identified when the mda requirement is raised to 17 furthermore these effects persist for 4 years after passage and more intensely in metropolitan areas coupling this research with existing literature suggests that when the mda requirement is raised to 18 only a small portion of the observed reduction in juvenile crime is

on the validity of econometric techniques with weak instruments inference on returns to education using compulsory school attendance laws we evaluate angrist and krueger 1991 and bound jaeger and baker 1995 by constructing reliable confidence regions around the 2sls and liml estimators for returns to schooling regardless of the quality of the instruments the results indicate that the returns to schooling were between 8 and 25 percent in 1970 and between 4 and 14 percent in 1980 although the estimates are less accurate than previously thought most specifications by angrist and krueger 1991 are informative for returns to schooling in particular concern about the reliability of the model with 178 instruments is unfounded despite the low first stage f statistic finally we briefly discuss bias adjustment of estimators and pretesting procedures as solutions to the weak instrument problem

long lasting effects of socialist education abstract political regimes influence the content of education and criteria used to select and evaluate students we study the impact of a socialist education on the likelihood of obtaining a college degree and on several labor market outcomes by exploiting the reorganization of the school system in east germany after reunification our identification strategy uses cutoff birth dates for school enrollment that lead to variation in the length of exposure to the socialist education system within the same birth cohort an additional year of socialist education decreases the probability of obtaining a college degree and affects longer term labor market outcomes for men

does compulsory school attendance affect schooling and earnings we establish that season of birth is related to educational attainment because of school start age policy and compulsory school attendance laws individuals born in the beginning of the year start school at an older age and can therefore drop out after completing less schooling than individuals born near the end of the year roughly 25 percent of potential dropouts remain in school because of compulsory schooling laws we estimate the impact of compulsory schooling on earnings by using quarter of birth as an instrument for education the instrumental variables estimate of the return to education is close to the ordinary least squares estimate suggesting that there is little bias in conventional estimates every developed country in the world has a compulsory schooling requirement yet little is known about the effect these laws have on educational attainment and earnings 1 this paper exploits an unusual natural experiment to estimate the impact of compulsory schooling laws in the united states the experiment stems from the fact that children born in different months of the year start school at different ages while compulsory schooling laws generally require students to remain in school until their sixteenth or seventeenth birthday in effect the interaction of school entry requirements and compulsory schooling laws compel students born

does school quality matter returns to education and the characteristics of public schools in the united states this paper estimates the effects of school quality measured by the pupil teacher ratio average term length and relative teacher pay on the rate of return to education for men born between 1920 and 1949 using earnings data from the 1980 census we find that men who were educated in states with higher quality schools have a higher return to additional years of schooling rates of return are also higher for individuals from states with better educated teachers and with a higher fraction of female teachers holding constant school quality measures however we find no evidence that parental income or education affects average state level rates of return

on the sign of the investment uncertainty relationship understanding the effects of uncertainty over any decision variable has fascinated economists for a long time risk aversion and incomplete markets are likely to make the investment uncertainty relationship negative e g roger craine 1989 joseph zeira 1989 what happens in the absence of risk aversion and incomplete markets is however ambiguous richard hartman 1972 and andrew b abel 1983 1984 1985 found that in the presence of symmetric convex costs of adjustment mean preserving increases in price uncertainty raise investment of a competitive firm as long as the profit function is convex in prices on the other hand the recent literature on irreversible investment e g robert s pindyck 1988 giuseppe bertola 1988 has shown that increases in uncertainty lower investment all these results have been derived under either risk neutrality or complete markets intuition suggests that the explanation for such a difference lies with the asymmetric nature of adjustment costs in the irreversible investment case as compared with the symmetry of the adjustment cost mechanisms proposed by abel and hartman although this intuition is confirmed in this paper asymmetric adjustment costs are shown not to be sufficient to explain why the results differ in fact a more hidden but at least as important difference between these two literatures is that the former assumes perfect competition and constant returns to scale whereas the latter assumes either imperfect competition or decreasing returns to scale or both 2 the purpose of this paper is to highlight the role of the decreasing marginal return to capital assumption due to either imperfect competition or decreasing returns to scale or both in determining the effects of adjustment cost asymmetries on the sign of the response of investment to changes in uncertainty under risk neutrality for this the paper develops a simple model with a cost of adjustment mechanism general enough to consider both symmetric convexity and irreversibility as special cases one of the most important findings is the lack of robustness of the negative relationship between investment and uncertainty under asymmetric adjustment costs3 to changes in the degree of competition in fact when firms are nearly competitive the conclusion of hartman and of abel holds no matter how asymmetric adjustment costs are studying adjustment cost mechanisms has a central role in understanding the dynamics of investment and its business cycle implications but conclusive results about the sign of the instantaneous relationship between uncertainty and investment should not be department of economics columbia university new york ny 10027 i am grateful to giuseppe bertola prajit dutta glen hubbard anil kashyap richard lyons and the referees for their useful comments 1the financial literature on investment has considered risk aversion through a premium in the discount rate determined by the capm capital asset pricing model intertemporal capm or consumption capm however often this discount rate is left unchanged when studying the response of investment to uncertainty changes e g pindyck 1988 pp 974 5 thereby omitting the effect of changes in uncertainty on investment due to risk aversion and incomplete markets 2in the typical version of the irreversible investment problem there is no cost of upward adjustments thus imperfect competition and or decreasing returns to scale are required to bound the size of the firm 3in this paper asymmetric adjustment cost refers to the case in which it is more expensive to adjust downward than upward certainly the opposite case is a trivial extension of the case studied in this paper

minimum wages and teenagers enrollment employment outcomes a multinominal logit model this paper tests the hypothesis that the effect of minimum wage legislation on teenagers education decisions is asymmetrical across family income classes with the legislation inducing children from low income families to reduce their levels of schooling and children from higher income families to increase their educational attainment we use data from the national longitudinal surveys nls and exploit the fact that although the minimum wage is fixed at a point in time its value relative to adult wages varies across areas multinomial logit models of teenagers enrollment employment outcomes are estimated the hypothesis appears to be confirmed for white teens however the evidence for nonwhites is more ambiguous

the compelling effects of compulsory schooling evidence from canada abstract compulsory school laws have existed for more than a hundred years and policies to mandate further education continue to be discussed the implications of these laws however are not well understood historical changes to compulsory schooling in canada permit an examination of their effects on would be dropouts under very different circumstances than those during changes in other countries mandating education substantially increased adult income and substantially decreased the likelihood of being below the low income cut off unemployed and in a manual occupation these findings suggest significant gains from this legislation which seem unlikely offset by the costs incurred while having to remain in school jel classification i20 i28

analysing wage differentials when workers maximize the return to human capital investment abstractthe analysis of the determinants of differences in wages across workers has traditionally relied on the estimation of average earnings functions in this article we propose a new theoretical model where it is the workers who decide the amount they wish to invest in human capital taking into account the costs of acquiring those skills for the purpose of maximizing earnings in this model both human capital and marginal productivity are likely to be influenced by the individual s unobserved characteristics such as ability or motivation potentially giving rise to endogeneity problems in this context the empirical implementation of our theoretical model allows us under certain assumptions to obtain consistent estimates even under the assumption of endogeneity we present an empirical application to the education sector using data from the spanish structure of earnings survey 2010 our results show that females and workers in the private education sector face more difficulties in achieving t

returns to education evidence from u k twins we use a new sample of uk female identical twins to estimate private economic returns to education we report findings in three areas first we use identical twins to control for family effects and genetic ability bias and the education reported by the other twin to control for schooling measurement error our estimates suggest a return to schooling for uk females of about 7 7 second we investigate within twin pair ability differences by examining within twin pair and between family correlations of education with observable correlates of ability including birthweight ability tests and reading scores our findings suggest lower ability bias in within twin pair regressions than pooled regressions third using data on twins smoking we show smoking reflects family background and using it as an instrument exacerbates ability bias this abstract was borrowed from another version of this item

using unemployment rates as instruments to estimate returns to schooling i use state unemployment rates during a person s teenage years to estimate the returns to schooling a higher unemployment rate reduces the opportunity costs of attending school using the same 1980 census data set that angrist and krueger 1991 use i also estimate returns to schooling with a modified version of their quarter of birth instrument the estimates from the two stage least squares 2sls model using the unemployment rate and the model using the quarter of birth instruments are almost identical in addition these 2sls estimates are larger than the ordinary least squares ols estimates supporting this counterintuitive yet prevalent result in the literature

estimation of limited dependent variable models with dummy endogenous regressors applied economists have long struggled with the question of how to accommodate binary endogenous regressors in models with binary and nonnegative outcomes i argue here that much of the difculty with limited dependent variables comes from a focus on structural parameters such as index coefcients instead of causal effects once the object of estimation is taken to be the causal effect of treatment several simple strategies are available these include conventional two stage least squares multiplicative models for conditional means linear approximation of nonlinear causal models models for distribution effects and quantile regression with an endogenous binary regressor the estimation strategies discussed in the article are illustrated by using multiple births to estimate the effect of childbearing on employment status and hours of work

identification weak instruments and statistical inference in econometrics we discuss statistical inference problems associated with identification and testability in econometrics we consider inference in non parametric models and weakly identified structural models weak instruments we point out that many ill defined statistical problems such as non testable hypotheses occur in these areas and are typically associated with asymptotic approximations in non parametric models such problems include testing moments and inference under heteroscedasticity or serial dependence of unknown form for weakly identified structural models difficulties are typically associated with improper pivots and we review recent developments aimed at proposing more reliable procedures including alternative proposed statistics bounds projection split sampling conditioning monte carlo tests jel classification c1 c12 c14 c15 c3 c5 identification instruments faibles et inference statistique en econometrie nous analysons les problemes d inference associes a l identification et a la testabilite en econometrie nous considerons l inference dans les modeles non parametriques et les modeles structurels faiblement identifies instruments faibles nous remarquons que beaucoup de problemes mal poses tels que des hypotheses non testables apparaissent dans ces domaines et que ceux ci sont typiquement associes a l emploi d approximations asymptotiques dans les modeles non parametriques de tels problemes incluent les tests sur les moments et l inference sous heteroscedasticite ou dependance serielle de forme non specifiee dans les modeles structurels faiblement identifies ces difficultes sont habituellement associees a l emploi de fonctions pivotales impropres et nous presentons un survol des methodes recentes ayant pour objectif d obtenir des procedures plus fiables ce qui comprend les differentes statistiques proposees l emploi de bornes la subdivision d echantillon les techniques de projection le conditionnement et les tests de monte carlo

taxation and the allocation of talent taxation affects the allocation of talented individuals across professions by blunting material incentives and thus magnifying nonpecuniary incentives of pursuing a calling estimates from the literature suggest that high paying professions have negative externalities whereas low paying professions have positive externalities a calibrated model therefore prescribes negative marginal tax rates on middle class incomes and positive rates on the rich the welfare gains from implementing such a policy are small and are dwarfed by the gains from profession specific taxes and subsidies these results depend crucially on externality estimates and labor substitution patterns across professions both of which are very uncertain given existing empirical evidence

the craft of labormetrics using a wide array of examples from the literature and from original estimates the author examines the pitfalls that make good empirical research in labor economics at least as much craft as statistical technique among the subjects discussed are the appropriateness and cleanliness of data problems of extreme observations the validity of attempts to produce exogeneity using instrumental variables natural experiments and structural models and the treatment of selectivity and unobservable individual effects the author stresses the importance of testing empirical results to ensure that they make sense and of presenting them clearly and economically

gone fishing reported sickness absenteeism and the weather i introduction the principal agent problem of contracting employee work effort that is imperfectly monitored arises in a number of areas of economic theory including models of remuneration by seniority lazear 1979 involuntary unemployment e g shapiro and stiglitz 1984 performance based pay macleod and malcomson 1998 and labor hoarding depken redmount and snow 2001 given the importance of this mechanism in the theoretical work the empirical research on the agency problem is remarkably scant in part this reflects the limited availability of personnel data as baker and holmstrom argue in their review article internal labour markets too many theories too few facts 1995 but more fundamentally it reflects the inherent difficulty of empirically capturing the employee effort levels that underlie the models using direct measures of employee or firm level productivity is unquestionably the preferred approach but these measures are notoriously problematic and the studies that use them tend to be case studies introducing external validity issues it is also unlikely to isolate the type of malfeasant shirking behavior that concerns variants of the models where the employee effort decision entails disciplinary risk to inform employee incentives to engage in malfeasant behavior economists have relied on two measures employee disciplinary rates e g cappelli and chauvin 1991 ichino and maggi 2000 and absenteeism rates e g arai and thoursie 2005 bradley green and leeves 2007 ichino and riphahn 2005 the difficulty is that disciplinary rates capture only shirking activity that is identified by employers not that which goes undetected while reported absenteeism particularly sickness absenteeism rates may be entirely legitimate one can therefore never be sure whether differences in these rates across workers facing different shirking costs reflect actual shirking activity as opposed to differences in employers willingness or ability to detect and punish shirkers or differences in employee health that may be correlated with these costs in this paper we identify a different type of shirking activity that potentially addresses both of these shortcomings employees misreporting health in order to exploit weather conditions favorable to high utility outdoor recreation 1 we begin by considering a shirking model of sickness absenteeism in which employees marginal utility of outdoor leisure is increasing in the interaction of two state dependent parameters health and outdoor weather quality the intuition being that ideal weather conditions for engaging in outdoor recreation are valued more when one is physically and perhaps also mentally healthy this assumption leads to two main propositions first increases in sickness absenteeism associated with marginal improvements in weather quality reflect the decisions of the inframarginal workers those workers who in the absence of the weather improvement would be present at work who are the healthiest implying an increase in absenteeism that is unambiguously illegitimate second comparing across workers marginal weather improvements should have the largest impact on sickness absenteeism where shirking costs are highest the reason is that where existing incentives to misreport health are the weakest such as where sick pay is not offered or job protection is weak existing sickness absenteeism levels will be lowest and the inframarginal workers will be the healthiest thereby benefitting most from the weather improvement we examine the empirical relevance of these propositions using a two step approach first we construct an index of weather preferences by linking temperature relative humidity precipitation wind speed and cloud cover data to time use data identifying the weekend and weekday evening outdoor recreational activities of employees with regular daytime work schedules we then examine the empirical relation between the resulting index of the recreational quality of the weather hereafter referred to simply as weather quality and the incidence of short term spells of sickness absenteeism reported in survey data comparing the magnitude of this relation across workers facing different levels of sick pay job protection and job finding rates

finishing high school and starting college do catholic schools make a difference in this paper we consider two measures of the relative effectiveness of public and catholic schools finishing high school and starting college these measures are potentially more important indicators of school quality than standardized test scores in light of the economic consequences of obtaining more education single equation estimates suggest that for the typical student attending a catholic high school raises the probability of finishing high school or entering a four year college by thirteen percentage points in bivariate probit models we find almost no evidence that our single equation estimates are subject to selection bias

order from chaos the effects of early labor market experiences on adult labor market outcomes this paper examines the consequences of initial periods of churning or mobility in the labor market to help assess whether faster transitions to stable employment relationships as envisioned by advocates of school to work programs would be likely to lead to better adult labor market outcomes an analysis of national longitudinal survey of youth data for the years 1979 92 yields modest evidence at best linking early job market stability to better labor market outcomes the authors find that for both genders adult labor market outcomes defined as of the late 20s or early to mid 30s are for the most part unrelated to early labor market experiences this evidence does not support efforts to explicitly target the school to work transition insofar as doing so implies changing the structure of youth labor markets so that workers form earlier and firmer attachments to employers industries or occupations

schooling and monetary rewards in greece an over education false alarm the paper uses data from the 1993 94 household survey to investigate a number of issues stemming from the current educational policy debate in greece private and social returns to investment in education are estimated and a test of the screening hypothesis is conducted no evidence was found that higher education is being used as a screening device and the returns to investment in education have been maintained to just below their level in the 1960s the central finding of the paper is that the fear of further expansion of the university system is highly exaggerated and that the economy could absorb even larger amounts of highly educated manpower of course such expansion could not take place unless there is an end of the state monopoly on the financing and provision of tertiary education

poverty and the political economy of public education spending evidence from brazil a large body of literature has emphasized the elite capture of democratic institutions as the explanation for the low levels of spending on public education in many low income democracies this paper provides an alternative to that longstanding hypothesis motivated by new cross country facts and evidence from brazilian municipalities we hypothesize that many democratic developing countries might invest less in public education spending because poor decisive voters prefer the government to allocate resources elsewhere one possible explanation is that low income voters could instead favor redistributive programs that increase their incomes in the short run such as cash transfers to test for this possibility we design and implement an experimental survey and an incentivized choice experiment in brazil the findings from both interventions support our hypothesis

the expansion and convergence of compulsory schooling in western europe 1950 2000 this paper examines the expansion of compulsory schooling in fifteen western european countries over 1950 2000 we show that a convergence process has occurred across these countries since 1950 we argue that the major driver of this phenomenon is the existence of decreasing aggregate returns to education that have limited the extension of compulsory schooling then we test whether convergence holds when confronted with other explanations described in the literature conditional convergence does hold and we find that openness has been another significant determinant of compulsory years of schooling reflecting the need of a skilled labour force in an increasingly globalized world

liberalization and rent seeking in china s labor market communist party membership can generate labor market benefits in at least two ways first the party may hand out direct benefits to favored groups in the form of higher earnings alternatively the party may function in much the same way as education in western countries screening workers for talent and motivation we find very little evidence of earnings premiums to party membership or to cadre status prior to chinese market liberalization with liberalization comes less emphasis on being red and a greater capacity to earn wages that reflect ability both observed through schooling and identified by the party we find that party premiums are inversely related to education modest premiums to cadre status appear in 1995

changes in compulsory schooling education and the distribution of wages in europe using data from 12 european countries and the variation across countries and over time in the changes of minimum school leaving age we study the effects of the quantity of education on the distribution of earnings we find that compulsory school reforms significantly affect educational attainment especially among individuals belonging to the lowest quantiles of the distribution of ability there is also evidence that additional education reduces conditional wage inequality and that education and ability are substitutes in the earnings function

efficient estimation with panel data when instruments are predetermined an empirical comparison of moment condition estimators i examine the empirical performance of instrumental variables estimators with predetermined instruments in an application to life cycle labor supply under uncertainty the estimators studied are two stage least squares generalized method of moments gmm forward filter independently weighted gmm and split sample instrumental variables i compare the bias efficiency trade off for the estimators using bootstrap algorithms suggested by freedman and by brown and newey results indicate that the downward bias in gmm is quite severe as the number of moment conditions expands outweighing the gains in efficiency the forward filter estimator however has lower bias and is more efficient than two stage least squares

optimal taxation and human capital policies over the life cycle this paper derives optimal income tax and human capital policies in a life cycle model with risky human capital the government faces asymmetric information regarding agents ability its evolution and labor supply when the wage elasticity with respect to ability is increasing in human capital the optimal subsidy involves less than full deductibility of human capital expenses on the tax base and falls with age income contingent loans or a deferred deductibility scheme can implement the optimum numerical results suggest that full deductibility of expenses is close to optimal and that simple linear age dependent policies perform very well

the relation between firm growth and q with multiple capital goods theory and evidence from panel data on japanese firms we derive from a model of investment with multiple capital goods a one to one relation between the growth rate of the capital aggregate and the stock market based q we estimate the growth q relation using a panel of japanese manufacturing firms taking into account the endogeneity of q identification is achieved by combining the theoretical structure of the q model and an assumed serial correlation structure of the technology shock which is the error term in the growth q equation for early years of our sample cash flow has significant explanatory power over and above q the significance of cash flow disappears for more recent years for the heavy industry when japanese capital markets was liberalized the estimated q coefficient implies that the adjustment cost is less than a half of gross profits net of the adjustment cost

human capital vs signalling explanations of wages increases wages by directly increasing the worker s productivity this learning explanation is usually associated with human capital theory however it seems unlikely that learning explains all the wage differences associated with schooling and work history better educated workers are not a random sample of workers they have lower propensities to quit or to be absent are less likely to smoke drink or use illicit drugs and are generally healthier it is unlikely that employers make full use of differences in propensities to quit or to be absent or sick when hiring workers these characteristics are often not directly observed and the americans with disabilities act precludes firms from using either poor health or the likelihood of future sickness as a hiring criterion unless it is directly related to job performance however if low levels of education are associated with these unfavorable employee characteristics and employers are allowed to take education into account when hiring workers we would expect employers to favor better educated workers as a means of reducing their costs of sickness and job turnover in turn students will take these hiring criteria into account when deciding how long to stay in school students will choose a length of schooling to signal their ability to employers and employers will demand a minimum level of schooling

dissecting the monty hall anomaly we assess competing explanations of irrational behavior in the monty hall problem by creating new variants of the problem some variants employ a feature that automates the merging of probabilities thus rendering transparent the probabilistic advantage of the rational choice that feature also enables systematic variation in informational asymmetry and in ordering of actions data from 77 subjects each of whom makes 30 binary decisions indicate that automated merging raises the fraction of rational choices from around 40 to over 80 other features examined have much less impact indicating the importance of a bayesian updating failure jel c91 d02 d81 d83

inequality and growth why differential fertility matters we argue that inequality and growth are linked through differential fertility and the accumulation of human capital we build an overlapping generations model in which dynasties differ in their initial endowment with human capital growth the income distribution and fertility are endogenous due to a quantiy quality tradeoff families with less human capital decide to have more children and invest less in education when initial inequality is high large fertility differentials lower the growth rate of average human capital since poor families who invest little in education make up a large fraction of the population in the next generation a calibrated model shows that this fertility differential effect is quantitatively important we also provide empirical evidence to confirm the links between inequality differential fertility and growth suggested by the model

estimating the effect of financial aid offers on college enrollment a regression discontinuity approach an important problem faced by colleges and universities that of evaluating the effect of their financial aid offers on student enrollment decisions is complicated by the likely endogeneity of the aid offer variable in a student enrollment equation this article shows how discontinuities in an east coast college s aid assignment rule can be exploited to obtain credible estimates of the aid effect without having to rely on arbitrary exclusion restrictions and functional form assumptions semiparametric estimates based on a regression discontinuity rd approach affirm the importance of financial aid as an effective instrument in competing with other colleges for students

educational reform ability and family background in this paper we evaluate the impact of a major school reform that took place in the 1950s in sweden on educational attainment and earnings the reform which has many common elements with reforms in other european countries including the uk consisted of increasing compulsor schooling imposing a national curriculum and abolishing selection by ability into academic and non academic streams at the age of 12 comprehensive school reform our data combines survey data with administrative sources we find that the reform increased both the educational attainment and the earnings of children whose fathers had just compulsory education however the earnings of those with educated parents declined possibly because of a dilution of quality at the top end of the education levels the overall effect of the reform was however positive

happy birthday you re insured gender differences in work ethics this study investigates the potential existence of cheating within the sickness insurance program results indicate that young male workers have strong preferences for leisure linked to birthday celebrations other workers appear to consider the costs of reporting in sick around birthdays as relatively large

estimating the variance of wages in the presence of selection and unobserved heterogeneity abstract identification of potential wage distributions by education is important to the study of the causal links between education inequality and uncertainty potential wage inequality within an educational group that is the variance in wages if all workers had the same education exceeds the observed statistics because self selected education truncates wage distributions decomposing potential wage inequality into heterogeneity known to the agent making the educational choice and uncertainty unknown to the agent suggests that wage uncertainty does not necessarily rise with education it is unobserved heterogeneity not uncertainty that explains the observed relationship between college graduation and higher wage inequality

school entry policies and skill accumulation across directly and indirectly affected individuals during the past half century there has been a trend toward increasing the minimum age a child must reach before entering school in the united states states have accomplished this by moving the school entry cutoff date earlier in the school year the evidence presented in this paper shows that these law changes increased human capital accumulation and hence adult wages backing up the cutoff by one month increases average male hourly earnings by approximately 0 6 percent the evidence also suggests that the majority of the cohort benefits from backing up the cutoff not just those who must delay entry

estimating the return to endogenous schooling decisions via conditional second moments this paper employs conditional second moments to identify the impact of education in wage regressions where education is treated as endogenous this approach avoids the use of instrumental variables in a setting where instruments are frequently not available we employ this methodology to estimate the returns to schooling for a sample of australian workers we find that accounting for the endogeneity of education in this manner increases the estimated return to education from 6 percent to 10 percent

priceless the nonpecuniary benefits of schooling copyright 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 by the american economic association permission to make digital or hard copies of part or all of american economic association publications for personal or classroom use is granted without fee provided that copies are not distributed for profit or direct commercial advantage and that copies show this notice on the first page or initial screen of a display along with the full citation including the name of the author copyrights for components of this work owned by others than aea must be honored abstracting with credit is permitted the author has the right to republish post on servers redistribute to lists and use any component of this work in other works for others to do so requires prior specific permission and or a fee permissions may be requested from the american economic association administrative office by going to the contact us form and choosing copyright permissions request from the menu copyright 2016 aea

why did the ssi disabled program grow so much disentangling the effect of medicaid the number of participants in the ssi program grew by 1 1 million from 1987 to 1993 this paper examines the role of medicaid on the ssi participation decision i use the rapid growth in average medicaid expenditure as a proxy for its value ols estimates of medicaid s effect may be biased because of omitted variables bias and measurement error i therefore apply two stage least squares to estimate medicaid s effect using average medicaid expenditure for blind ssi recipients as an instrument these estimates show that rising medicaid expenditure significantly increased ssi participation among adults with low permanent incomes explaining 20 of the growth

returns to investment in education a global update the author updates compilations of rate of return estimates to investment in education published since 1985 and discusses methodological issues surrounding those estimates some key patterns among the three main levels of education primary education continues to exhibit the highest social profitability in all world regions private returns are considerably higher than social returns because of the public subsidization of education the degree of public subsidy increases with the level of education which is regressive social and private returns at all levels generally decline by the level of a country s per capita income overall the returns to female education are higher than those to male education but at individual levels of education the pattern is more mixed the returns to the academic secondary school track are higher than the vocational track since unit cost of vocational education is much higher and the returns for those who work in the private competitive sector of the economy are higher than in the public noncompetitive sector and the returns in the self employment unregulated sector of the economy are higher than in the dependent employment sector controversies in the literature are discussed in the light of the new evidence the undisputable and universal positive correlation between education and earnings can be interpreted in many ways the causation issue on whether education really affects earnings can be answered only with experimental data generated by randomly exposing different people to various amounts of education given the fact that moral and pragmatic considerations prevent the generation of such pure data researchers have to make do with indirect inferences or natural experiments some have been attempted the author looks at the research on overeducation or surplus schooling the conclusions reinforce earlier patterns they confirm that primary education continues to be the number one investment priority in developing countries they also show that educating females is marginally more profitable than educating males that the academic secondary school curriculum is a better investment than the technical vocational tract and that the returns to education obey the same rules as investment in conventional capital that is they decline as investment is expanded