a simple estimator for simultaneous models with censored endogenous reggressors this paper presents a simple two step estimator for models with censored endogenous regressors and sample selection bias the approach unifies the literature on censored endogenous regressors and sample selection bias and provides extensions the procedure employs generalized residuals to adjust for the inconsistency caused by the endogeneity of the censored regressors the paper also provides two new tests of weak exogeneity an empirical example examining the trade off between fringe benefits and wages indicates that the estimation procedure works well a monte carlo experiment suggests that the proposed tests have good power properties copyright 1993 by economics department of the university of pennsylvania and the osaka university institute of social and economic research association

the price of pollution a dual approach to valuing so2 allowances under the 1990 clean air act amendments a market based scheme to reduce u s sulfur dioxide emissions takes effect in 1995 indications are that participation in the market will be light and allowance prices will be lower than was once expected using an output distance function approach for wisconsin coal burning utility plants we estimate the shadow price of so2abatement which should approximate the allowance price the estimated average shadow price is above the prices at which the few observed allowance trades have occurred wisconsin s stringent state so2legislation may explain a portion of this divergence

the use of quantile regressions in estimating gender wage differentials a case study of the philippines quantile regressions are used to analyse the size components and nature of the gender earnings differentials as well as the returns to education by gender in the philippines over the entire conditional distribution of earnings using data from the 1999 apis survey this approach allows more focused conclusions about the nature of gender earnings differentials incorporating the quantile regression approach to the oaxaca blinder decomposition allows the localization of gender discrimination to particular quantiles of the earnings distribution and permits more targeted policy intervention

sequential tests of the arbitrage pricing theory a comparison of principal components and maximum likelihood factors we examine the cross sectional pricing equation of the apt using the elements of eigenvectors and the maximum likelihood factor loadings of the covariance matrix of returns as measures of risk the results indicate that for data assumed stationary over twenty years the first vector is a surprisingly good measure of risk when compared with either a one or a five factor model or a five vector model we conclude that in some circumstances principal components analysis may be preferred to factor analysis

sources of intra industry wage dispersion how much do employers matter observed human capital explains less than half of wage variation in bls industry wage surveys establishment based wage differentials controlling for occupation account for 20 70 percent of intra industry wage variation this corresponds to a standard deviation in wages of 14 percent of the mean almost as large as interindustry wage variation investigation suggests that establishment wage differentials are not random variations or returns to usual measures of human capital

effects of family background on earnings and returns to schooling evidence from brazil we investigate whether omitted family background variables are responsible for high returns to schooling estimated in brazil returns to schooling fall by about one third when parental schooling is added to wage equations surprisingly the schooling of fathers in law has larger effects on wages than the schooling of fathers on the basis of a model of assortative mating we interpret this as evidence that parental characteristics represent unobservable worker attributes rather than nepotism in the labor market we conclude that the family background bias in returns to schooling is modest and need not imply returns to family connections

the 1990s rise in swedish earnings inequality persistent or transitory this article decomposes the rise in the cross sectional variance of male annual earnings in sweden between 1991 and 1999 into its persistent and transitory components the results show that the persistent component accounts for basically all of the increase in earnings dispersion this implies that the answer to the 1990s trend reversal in swedish earnings inequality is to be found in explanations that focus on persistent changes in the labour market such as changes in the price of skills

decomposing intergenerational income elasticity the gender differentiated contribution of capital transmission in rural philippines summary using longitudinal data from rural philippines we decompose intergenerational income elasticity ige into five distinct pathways intergenerational transmissions of health education land and spouse education capital plus residual correlation in productivity intergenerational human capital transmissions from mothers are stronger than those from fathers maternal education is the parental capital most strongly associated with ige while naive ige estimates are indistinguishable for sons and daughters the pathways that generate these results differ strikingly for sons ige is entirely explained by parent to child capital transmission by contrast strong income correlation exists between daughters and parents even after controlling for parent and child capital endowments

the returns to schooling a selectivity bias approach with a continuous choice variable the essence of selection bias is that we do not observe nonoptimal choices this applies whether the choice variable is discrete or continuous this paper extends the selection bias methodology to the case where the choice variable is continuous and the choice set is ordered the leading practical application of this analysis is the schooling choice problem schooling is treated as a continuous choice variable and selectivity corrected rates of return are estimated the findings suggest selectivity is of considerable importance and support the comparative advantage hypothesis of willis and rosen 18

on decomposing the wage gap a critical comment on blinder s method many studies have found that the impact of schooling on earnings is greater for females than for males despite the fact that females tend to earn less both absolutely and controlling for personal characteristics this study investigates possible

a dynamic mincer equation with an application to portuguese data this article argues in favour of a dynamic specification of the mincer equation where the past observed earnings play the role of additional explanatory variable for current observed earnings a dynamic approach offers an explanation why the return to schooling in terms of observed earnings is not independent of labour market experience as suggested by some recent empirical evidence for the united states

combining results of different models the case of a levy on the dutch nitrogen surplus economic instruments such as levies are considered by the dutch government for reducing the harmful effects of the production and application of manure to analyse these levies a framework which makes it possible to combine and to choose among different types of research is developed the results are integrated along the line of the marginal abatement cost curve the problems related to integrating different types of research are taken into account the method developed allows every farmer to react to a levy differently a levy turns out to be more effective to reduce the nitrogen surplus on farm level in the pig fattening sector when compared to the pig breeding sector but even a levy of 2 guilders kg of nitrogen does not remove the total manure surplus in the pig sector and results in large profit losses further research is needed to underpin the empirical input required by the model

minimum wages and the gender wage gap estimates are made of the effect of minimum wages on the size and composition of the gender wage gap in canada in 1986 it is found that minimum wages close the wage gap substantially for young workers and less so for adults the reduction in the gap is most attributable to the adverse employment effects of minimum wages the results also indicate that most of the reduction in the gap is realized through a fall in the discriminatory component

changes in the u s wage structure 1963 1987 application of quantile regression the 1980 s witnessed rapid changes in the structure of wages in the united states in this study recently developed techniques for quantile regression are applied to every march current population survey since 1964 and changes in the return to schooling and experience at different points of the wage distribution are examined the quantile regression technique parsimoniously describes the entire conditional wage distribution this conditional distribution is used to examine changes in within group wage inequality as measured by the difference between conditional quantiles two linear models are considered a simple one group model and a 16 group model the results suggest that the returns to schooling and experience differ across quantiles of the wage distribution but their patterns of change are similar significant differences in wage inequality are also found across the various skill groups the paper also presents a new imputation method for cps data

incentives in principal agent relationships this article identifies some of the major issues that have been examined in the literature on incentives the article begins by discussing the frictions that lie at the heart of incentive problems next the principal s optimal response to these frictions is explored taking as given the characteristics of the agents with whom the principal interacts in a nonrepeated setting the design of individualized contracts contests and tournaments is analyzed then the principal s task of selecting the best agent is addressed and repeated agency relationships are considered

a cautionary note on tests of overidentifying restrictions in this note we argue that tests of overidentifying restrictions give little information on the validity of the moment conditions implied by the underlying economic model and therefore are mute about the possibility of identifying the parameters of interest

human capital and regional wage gaps lopez bazo e and motellon e human capital and regional wage gaps regional studies this paper uses micro level data to analyse the effect of human capital on regional wage differentials the results for the set of spanish regions confirm that they differ in the endowment of human capital but also that the return that individuals obtain from it varies sharply across regions regional heterogeneity in returns is especially intense in the case of education particularly when considering its effect on the employability of individuals these differences in endowment and especially in returns to human capital account for a significant proportion of regional wage gaps lopez bazo e and motellon e lopez bazo e et motellon e le capital humain et les ecarts des salaires regionaux regional studies cet article emploie des m

what factors drive individual misperceptions of the returns to schooling in tanzania some lessons for education policy evidence on educational returns and the factors that determine the demand for schooling in developing countries is extremely scarce building on previous studies that show individuals underestimati

glass ceiling and double disadvantage effects women in the us labour market gender pay issues in the us labour market are examined using 1990 and 2000 us census data for three groups the native born immigrants from english speaking countries and immigrants from non english speaking countries quantile regression estimates reveal different patterns of wage effects across the wage distribution females have lower rates of pay across the entire wage scale there is minimal evidence of glass ceiling effects immigrant women from non english speaking countries are argued to experience a double disadvantage effect

returns to education and wage equations the paper shows why considering a number of education dependent covariates in a wage equation decreases the coefficient of education in that equation this result is illustrated empirically with a meta analysis for portugal the education coefficient decreases when covariates are used that can be considered post education decisions on the other hand it is independent of sample size tenure and whether hourly or monthly wages are used these results support the use of a simple specification of the mincer equation for the study of the total returns to education

evidence on the glass ceiling effect in france using matched worker firm data in this article we investigate the relevance of the glass ceiling hypothesis in france according to which there exist larger gender wage gaps at the upper tail of the wage distribution using a matched worker firm data set of about 1 30 000 employees and 14 000 employers we estimate quantile regressions and rely on a principal component analysis to summarize information specific to the firms our different results show that accounting for firm related characteristics reduces the gender earnings gap at the top of the distribution but the latter still remains much higher at the top than at the bottom furthermore a quantile decomposition shows that the gender wage gap is mainly due to differences in the returns to observed characteristics rather than in differences in characteristics between men and women

returns to endogenous education the case of honduras the rapid expansion of the education sector in developing countries and the scarcity of public funds have increased the need for an accurate evaluation of educational policies estimates of rates of return to education have often been used as an integral part of cost benefit studies and programme evaluation efforts this study uses household survey data from honduras for 1990 to estimate returns to education that allow for worker heterogeneity and individual self selection in the education process a sequential estimation procedure is used that enables study of the interaction between educational attainment and earnings determination it is found that accounting for endogenous educational attainment leads to substantially higher estimated returns to education compared to traditional least squares estimates the possible magnitude of the bias underscores the importance of recognizing the role of self selection and comparative advantage in the education process

comparative measures of performance for u s based international equity mutual funds abstract this paper compares an international two index model to an international arbitrage pricing theory iapt two factor model to evaluate the performance of 37 u s based international mutual funds over the 1985 1993 period results from the index model confirm prior research that international funds perform as well as the market proxy in contrast the iapt model implies superior investment performance by the international funds moreover the two models produce different relative performance rankings intertemporal comparisons of the models indicate that the multifactor iapt model better reflects the international equity return generating process

human capital discrimination and the gender wage gap in bangladesh summary this paper investigates changes in the gender wage gap in bangladesh over the period 1999 2009 the gap in average wages between men and women decreased by 31 over this period this paper shows that a key driver of this change was an improvement in female educational qualifications it also demonstrates that the gender wage gap across the wage distribution narrowed much more at the lower end of the wage distribution than at the upper end it attributes this mainly to a decline in discrimination against women implications for policies aimed at more equal access to education and enforcement of equal pay legislation in bangladesh are also identified

a study of monthly mutual fund returns and performance evaluation techniques this paper empirically contrasts the jensen measure the positive period weighting measure developed in grinblatt and titman 1989b and a measure developed from the treynor mazuy 1966 quadratic regression on a sample of 279 mutual funds and 109 passive portfolios using a variety of benchmark portfolios the study finds that the measures generally yield similar inferences when using the same benchmark and that inferences can vary even from the same measure when using different benchmarks this paper also analyzes the determinants of mutual fund performance tests of fund performance that employ fund characteristics such as net asset value load expenses portfolio turnover and management fee are reported these tests surprisingly suggest that turnover is significantly positively related to the ability of fund managers to earn abnormal returns

gender wage inequality during sri lanka s post reform growth a distributional analysis abstract this paper investigates gender wage inequality in sri lanka during 1992 2014 a period of robust economic growth following pro market reforms the gap in mean wages between men and women decreased steadily over this period unconditional quantile regression reveals the decline in gender wage inequality was driven by the upper half of the distribution and was due to improvements in women s observable human capital yet the pay structure became more unequal indicating widening gender gaps in the returns to labor market characteristics and in unobservable determinants of wages the gender gap in pay structure widened disproportionately in the lower half of the distribution coinciding with falling absolute and relative returns to women in manufacturing industries and production occupations facing greater international competition the study also demonstrates selection bias underestimates the gender wage gap and overestimates the gains in equality over time factors that hinder gender equality in the labor market are discussed along with policy implications

how much of a threat to economic growth is a mature aids epidemic the article models the impact on economic growth of hiv aids when the epidemic is in a mature phase in contrast with previous studies focused on periods of expansion as it is typically the case in african countries simulations for honduras the epicentre of the epidemic in central america show that aids is not likely to threaten economic growth neither through labour nor capital accumulation channels impacts are estimated between 0 007 and 0 27 points of gross domestic product gdp growth annually for the period 2001 to 2010 increasing spending on prevention higher public treatment subsidies and increasing treatment access will not jeopardize economic growth prospects critical factors that slash economic growth in africa such as human capital reductions and shifts in relative skills are not strong in honduras

nitrogen land substitution in corn production a reconciliation of aggregate and firm level evidence in this paper we seek to reconcile low farm level substitution elasticity between nitrogen fertilizer and land with larger industry level values for the corn sector this is accomplished with a micro simulation model which identifies twenty three heterogeneous groups of corn farmers based on survey data for indiana after controlling for soil quality slope crop rotation and natural nitrogen sources considerable variation in fertilizer application rates remains model simulations indicate that the estimated substitution elasticity at the state level 1 15 is consistent with very low farm level substitutability the difference is attributable to compositional changes in the wake of relative price shocks these compositional effects are potentially very important but they are ignored in most policy analyses

a new approach to testing asset pricing models the bilinear paradigm we propose a new approach to estimating and testing asset pricing models in the context of a bilinear paradigm introduced by kruskal 18 this approach is both simple and at the same time quite general as an illustration we apply it to the special case of the arbitrage pricing model where the number of factors is pre specified the data appear to be generally in conflict with a five or seven factor representation of the model used by roll and ross 30 when we consider the number of replications of our test and the large number of observations on which it is performed the frequency with which we reject the three factor apm does not lead us to conclude that this model is unrepresentative of security returns further the rejection of the five and seven factor versions is to be expected if the three factor version is correct the paradigm gives insight into the appropriate specification of the model and suggests that there may be a small number of economy wide factors that affect security returns tests of asset pricing models on the basis of observed stock market data have represented a staple of the financial economics literature of the past twenty years the early work is reviewed in the famous paper by jensen 12 and papers by fama and macbeth 6 rosenberg and marathe 31 and roll and ross 30 there has been a great deal of confusion regarding what testable propositions are implied by these models see discussion in roll 29 in this paper we show that at a minimum all asset pricing models yet proposed imply a simple easily testable hypothesis which we refer to as the bilinear hypothesis while specific models may imply further testable propositions if the bilinear hypothesis is rejected the model is inconsistent with the data and should be rejected our test exploits the fact that the economic content of any equilibrium asset pricing model can be expressed in the form of a potentially refutable constraint on the set of parameters of the process generating security returns this constraint specifies that given a set of security specific characteristics there exists a linear relationship common across securities relating expected returns to these

measuring investment performance in a rational expectations equilibrium model much research has been concerned with evaluating the performance of managed portfolios e g mutual funds and examining whether portfolio managers display in some sense superior performance superior performance would seemingly turn on the possession of superior information that is utilized in managing portfolios in general a fund s asset holdings or portfolio weights might not be observable to an outsider whether they are or not however they are likely to change over time this happens especially when better performance is a result of superior information since managers will change their portfolio composition on obtaining private information since such changes must be taken into account the problem of measuring performance of managed portfolios is inherently different from that of evaluating the performance of individual assets groups of assets or generally portfolios with constant and known composition

a comparison of single and multifactor portfolio performance methodologies a comparison of single and multifactor portfolio performance methodologies using value line and size ranked portfolios indicates that although both methodologies provide unbi ased estimates of portfolio performance there are systematic differences in the power of the two methodologies the predictive power of the multifactor methodology is superior for well diversified portfolios but inferior for less diversified portfolios

schooling and the distribution of wages in the european private and public sectors international research has shown that schooling enhances within groups wage dispersion this assessment is typically based on private sector data and up to date the inequality implications of schooling have not been documented for the public sector this article uses recent data from eight european countries to explicitly take into account differences between the private and public sectors using quantile regression the article describes the effects of schooling on the location and shape of the conditional wage distribution in each sector while the average impact of schooling on wages is similar across sectors the impact of schooling on within groups dispersion is found to be substantially larger in the private sector than in the public sector this finding warns that the effects of the european educational expansion on overall within groups dispersion may be lower than previously thought

derived factors in event studies abstract we examine the utility of the statistical factor model of the process generating stock returns in the context of event studies for a variety of estimation procedures and experimental designs we find limited value added relative to the use of a simple market model we would attribute this finding to misspecification of the statistical factor analysis model and suspect that there exist more robust procedures for estimating the factor structure of stock returns

lower and upper bounds of returns to schooling an exercise in iv estimation with different instruments abstract several recent studies based on exogenous sources of variation in educational outcomes show iv estimates of returns to schooling that are substantially higher than the corresponding ols estimates card 1995a earnings schooling and ability revisited research in labor economics 14 23 48 suggests that these results are explained by the existence of heterogenity in individual returns and by the fact that these studies are based on instruments that influence only the educational decision of individuals with high marginal returns due to either liquidity constraints or to high ability this conclusion is consistent with the local average treatment effect late interpretation of iv imbens and angrist 1994 identification and estimation of local average treatment effects econometrica 62 467 475 according to which iv identifies only the average returns of those who comply with the assignment to treatment mechanism implied by the instrument we show evidence for germany suggesting that returns to schooling are heterogeneous instruments matter and the late interpretation of iv makes sense with an appropriate choice of instruments we also show how iv can be used to approximate the range of variations of returns to schooling in germany

a distributional analysis of the gender wage gap in bangladesh this article empirically investigates the gender wage gap in bangladesh during the period 2005 2009 applying unconditional quantile regression models the article demonstrates that women are paid less than men throughout the wage distribution and the gap is higher at the lower end of the distribution discrimination against women is the primary determinant of the wage gap the article also demonstrates that the observed gender wage gap is likely to be underestimated if we ignore selection in full time employment a number of policy implications are discussed

on levies to reduce the nitrogen surplus the case of dutch pig farms pig farms in the netherlands pay a zero or low price for using the environment as a consequence the environment is overused the dutch government wants to reduce the emissions of nitrogen and phosphorus possible instruments are regulation and levies in this study a levy on feed and a levy on the nitrogen surplus are investigated by incorporating a bad output in the production model the model is estimated using panel data of dutch pig farms over the period 1975 1989 levies on nitrogen turn out to be more cost effective than levies on feed

the analytics of performance measurement using a security market line security market line sml analysis while an important tool has never been fully justified from a theoretical standpoint assuming symmetric information and an inefficient index we show that sml analysis can be grossly misleading since in general efficient and inefficient portfolios can plot above and below the sml on a more positive note if sml analysis uses the return on a marketed riskless asset for the zero beta rate efficient portfolios must plot above the sml nonetheless arbitrarily inefficient portfolios also plot above the sml mean variance theory is still the premier theory in finance it continues to survive theoretical criticism and empirical rejection2 and it does so in no small part because of the popularity of using deviations from the security market line sml in performance measurement of portfolio managers and in event studies of the price impact of information the sml is the relationship between risk and return predicted by the mean variance model namely that risk as measured by beta and expected return are linearly related sml analysis interprets deviations in expected return from the sml as abnormal returns above or below what is appropriate or warranted for the amount of risk taken on however in the mean variance model all assets and portfolios lie on the sml ex ante and any ex post deviations from the sml are attributable solely to statistical measurement errors it is for this reason that roll 22 25 has argued that justification for sml analysis must lie outside the original mean variance model the purpose of this paper and its companion paper dybvig and ross 8 is to study whether sml analysis is valid in several plausible theoretical frameworks i e whether theory justifies intuition specifically in this article we examine the validity of using sml analysis when the index portfolio is inefficient in the companion paper we look at performance yale school of management the authors appreciate especially helpful comments from michael brennan gregory conner mike gibbons mark grinblatt jon ingersoll paul pfeiderer and richard roll the first author is grateful for support under the batterymarch fellowship program and the second author is grateful for support from the national science foundation this paper and its campanion paper dybvig and ross 8 evolved from dybvig and ross 7

the number of factors in security returns both factor analysis of security returns and the analysis of eigenvalues seem to indicate that a market factor explains the major part of security returns we find that such evidence is consistent with an economy where there are in fact k equally important priced factors eigenvalue analysis in the context of such an economy will lead an investigator to the false inference that the one important factor is the return on an equally weighted market index this paper examines a particular exact k factor economy where each of the k factors is priced and contributes equally on average to the variance of returns we show analytically that for such an economy the approximate factor solution identifies the first factor as the return on an equally weighted market index and would lead to the inference that the remaining h 1 factors are not priced using a cross section regression technology our particular model is consistent with existing empirical work that has studied the number of factors in security markets these results suggest an important caveat to the interpretation of approximate factor solutions in an apt or multibeta pricing context one might also infer a capm bias in tests of the apt using the factor analysis technology on a more positive note the results suggest a simple rotation of the factor analysis solution that will lead to more powerful tests of the asset pricing relations to motivate this study consider the fact that the single factor market model suggested by markowitz 1959 and developed by sharpe 1963 remains one of the most popular empirical models of the return generating process the widespread acceptance of this model owes much to the work of king 1966 through a seven factor analysis of return data he concludes that one factor explains a large percentage of the variance of stock prices a factor on which each security tends to weight positively he interpreted this result to mean that there exists a basic market factor in operation which has a major effect on all securities this work supported the development of empirical research into the capital asset pricing model the model has been extensively applied in the event study context

empirical age earnings profiles the human capital earnings function in which earnings are expressed as a quadratic in potential experience is probably the most widely accepted empirical specification in economics in spite of its widespread acceptance the human capital earnings function provides a very poor approximation of the true empirical relationship between earnings and experience the standard formulation understates early career earnings growth by about 30 50 and overstates midcareer growth by 20 50 however simple alternative specifications that fit the data are available

women wages and discrimination some evidence from taiwan in 1982 male employees in taiwan earned an average monthly salary of nt 11 008 us 275 women earned under two thirds of this at nt 7 087 this paper examines whether the male female earnings differential in taiwan can be explained by different endowments between the sexes of productivity related characteristics such as education and work experience if men and women are paid according to the same wage structure different endowments will account for all the observed earnings differential any wage gap that remains as a residual after adjustment for endowments can be interpreted as evidence of wage discrimination between the sexes following the work of oaxaca and malkiel and malkiel there is now a large number of american studies that use human capital theory as the basis for decomposing sex specific earnings into an endowment component and a discrimination component estimates also exist for canada and britain 2 house in his calculations for cyprus has provided the first estimates for a developing country 3 a case study for taiwan is particularly interesting not only because of the role of female employment in taiwan s industrial growth but also because the quality of the data makes possible a sharper test of discrimination than most other studies

bad karma or discrimination male female wage gaps among salaried workers in india summary we use nationally representative data from the employment unemployment surveys in 1999 2000 and 2009 10 to explore gender wage gaps among regular wage salaried rws workers in india both at the mean as well as along the entire wage distribution to see what happens where the gender log wage gap at the mean is 55 in 1999 2000 and 49 in 2009 10 but this change is not statistically significant the blinder oaxaca and the machado mata melly decompositions indicate that in both years the bulk of the gender wage gap is unexplained i e possibly discriminatory they also reveal that over the decade while the wage earning characteristics of women improved relative to men the discriminatory component of the gender wage gap also increased in fact in 2009 10 if women were paid like men they would have earned more than men on account of their characteristics in both years we see the existence of the sticky floor in that gender wage gaps are higher among low wage earners and lower for high wage earners over the ten year period we find that the sticky floor became stickier for rws women machado mata melly decompositions reveal that in both years women at the lower end of the wage distribution face higher discriminatory gaps compared to women at the upper end

some empirical tests of the theory of arbitrage pricing we estimate the parameters of ross s arbitrage pricing theory apt using daily return data during the 1963 78 period we compare the evidence on the apt and the capital asset pricing model capm as implemented by market indices and find that the apt performs well the theory is further supported in that estimated expected returns depend on estimated factor loadings and variables such as own variance and firm size do not contribute additional explanatory power to that of the factor loadings

parental childcare and children s educational attainment evidence from china this paper examines the determinants of child educational attainment in addition to those examined in previous studies it is found that maternal childcare is another important determinant of child educational attainment the results are robust after controlling for endogeneity the iv estimates show that once childcare time is controlled for child health does not have an effect on school enrolment age this finding suggests that omitting the childcare time may have biased the estimated effect of child health on school enrolment in previous studies

more equal but less mobile education financing and intergenerational mobility in italy and in the us a centralised and egalitarian school system reduces the cost of education for poor families and so it should reduce income inequality and make intergenerational mobility easier in this paper we provide evidence that italy compared to the usa displays less income inequality as expected given the type of school system but also less intergenera tional upward mobility between occupations and between education levels we explore some of the reasons which can explain this puzzling result and conclude that in a world in which family background is important for labor market success a centralised and egalitarian tertiary education does not necessarily help poor children and may take away from them a fundamental tool to prove their talent and to compete with rich children 1999 elsevier science s a all rights reserved

far away from a skill biased change falling educational wage premia in italy in this article we apply quantile regressions to investigate the evolution of educational wage premia ewp in italy from 1993 to 2004 using the survey of the household income and wealth shiw bank of italy and different classifications for educational attainments we show that in the private sector ewp have generally decreased over time considering both continuous and categorical specifications for education at all quantiles of the wage distribution different patterns are observed in the public sector where ewp remain basically stable over time a number of robustness checks and various econometric specifications are also applied in order to address sample selection issues our findings provide additional evidence in favour of the thesis that the increasing patterns in inequality and ewp and the related interpretations concerning skill biased changes are much less pronounced in continental europe than in anglo saxon countries

educational attainment and earnings determination in colombia the expansion of the education sector in developing countries since the mid 1950s is certainly impressive between 1950 and 1980 primary and secondary enrollment ratios in many of these countries tripled or quadrupled and the educational gap with respect to developed countries narrowed although most social planners and politicians would argue that there is still a long way to go before socially optimal levels of education are attained it is also commonly acknowledged that there is an increasing need for a more careful and systematic evaluation of educational policies and by implication public funding priorities 2 although there is the question of whether all types of education should be considered equally much of the work in the evaluation process has been devoted to the production of estimates of the social and private rates of return to schooling 3 most of the early research in this area ignored the effects of educational quality heterogeneous individual abilities and other types of selection bias issues these so called first generation models produced relatively high rates of return to additional years of education from 15 to 30 depending on the country and statistical methodology employed 4 these estimates led to a form of consensus that education was a high priority item in government budget planning there is only limited evidence of how rates of return have fared subsequent to the growth of the education sector in the case of colombia however g psacharopoulos noted that the rate of return to education fell from about 20 in the early sixties to below 10 by 1979 5 during the eighties a number of second generation studies

regulating nitrogen pollution with risk averse farmers under hidden information and moral hazard we consider a model of pollution regulation for a risk averse farmer involving hidden information moral hazard and risk sharing the representative farmer faces a production risk originating from nitrogen leaching and privately observes the soil capacity in retaining nitrogen only after the regulation contract is signed the latter specifies a transfer and a nitrogen quota whose decomposition by the farmer among different production stages is unknown to the regulator we first characterize the optimal solution to the regulator s problem the sequential decision model is estimated on french crop production data and the results are used to calibrate and simulate the optimal contract

does unmeasured ability explain the wage premium associated with technological change quantile regression analysis by using the quantile regressions of earnings equation we find that the educational wage premium is higher in industries with rapid technological change than in industries with slower technological change at every decile in the distribution of wage residuals the wage premium associated with the technological change is mostly explained by the returns to workers unobserved heterogeneities which are correlated with education rather than the rents of high tech industries

why do diplomas pay an expanded mincerian framework applied to mexico we compare four explanations for the value of diplomas each of which has implications for unemployment and wage variation amongst graduates most of which have not previously been tested for when seeking to explain the effects of diplomas we test for these implications using a refined econometric framework exploiting idiosyncrasies in mexican labour market and educational institutions premiums in mexico appear to result from diplomas tied to jobs with downwards rigid wages an uncommon but simple explanation the standard explanations including screening are not suggested by mexican data our results illuminate how labour markets segmented by diplomas clear this depends upon the nature of the labour market rigidities exactly as predicted by neoclassical theory

the returns to education in africa some new estimates abstractwe estimate the rate of return to education for 12 african countries using recent data and a range of methodologies which we apply consistently across all countries our findings confirm that the return to basic education is the lowest 7 10 the returns to upper secondary and tertiary education are similar to one another 25 30 accounting for the risk of joblessness increases these rates of return particularly for basic education and for women at tertiary level our results at the country level suggest that great care should be taken in choosing the appropriate methodology to estimate rates of return

changes in the rate of return to education in sweden 1968 1991 this paper estimates changes in the rate of return to education in sweden between 1968 and 1991 both the quantity years of schooling completed and quality highest qualification obtained dimensions of education are considered adopting a human capital approach the rate of return is measured in terms of differences in wage rates associated with differences in education both quadratic wage and cubic spline wage functions are estimated the data used are from the 1968 1981 and 1991 swedish level of living surveys

an investigation of the labor market earnings of panamanian males evaluating sources of inequality this paper presents empirical evidence on the determinants of labor market earnings and inequality for males in panama using newly available microdata we estimate earnings equations based on the measurement framework of mincer 1974 and compare them with those for other countries at various stages of economic development we present evidence on two aspects of inequality in less developed economies labor market segmentation and social stratification we present tests of the segmentation hypothesis including several of the dual labor market hypotheses and discuss their inherent ambiguity we also present evidence on the importance of family background for earnings determination and educational attainment

economic reform and mortality in the former soviet union a study of the suicide epidemic in the 1990s abstract male suicide rates in russia belarus ukraine and the baltic countries increased substantially in the early 1990s and are now the highest in the world to what extent is this suicide epidemic explained by the macroeconomic instability experienced by these countries in that period fixed effects regressions across 22 transition economies indicate that male suicide rates are highly sensitive to the state of the macroeconomy suggesting that the steep and prolonged declines in gdp in the western countries of the former soviet union may have been partly to blame for the suicide epidemic evidence also indicates that the general adult male mortality crisis in the region had a feedback effect on suicide rates with the loss of a spouse or friend or declining life expectancy itself contributing to rising suicide rates female suicide rates in contrast are insensitive to the state of the macroeconomy and are more strongly related to alcohol consumption

orthogonal frontiers and alternative mean variance efficiency tests this paper catalogues properties of minimum norm orthogonal portfolios portfolios which minimize a quadratic objective function and have returns uncorrelated with those of a candidate portfolio that is not mean variance efficient the analysis shows that the dollar versions of these portfolios correspond to estimators of zero beta rates based on alternative statistical criteria and grouping procedures while costless orthogonal portfolios represent candidate mean variance efficiency tests it also develops inference procedures for zero and unit net investment portfolios of individual securities instead of grouped portfolios that have zero expected betas the resulting mean variance efficiency tests are reasonably insensitive to the underlying statistical assumptions i introduction most mean variance efficiency tests follow from the following simple intuition if a given portfolio p is mean variance efficient all portfolios that cost a dollar and have returns uncorrelated with those of p i e zero beta portfolios have identical expected returns hence all costless zero beta portfolios have expected returns of zero when p is mean variance efficient however the situation is altered considerably when p is not a mean variance efficient portfolio in this case roll 1980 has shown that there are portfolios that cost a dollar and have returns uncorrelated with those ofp at all levels of mean return as a consequence there are costless zero beta portfolios at all levels of expected return as well when p is inefficient mean variance efficiency tests typically involve asking whether particular costless zero beta portfolios have zero expected returns the translation of this intuition into operational test statistics is a problem in sampling theory for example when tests are based on costless portfolios with zero sample betas appropriate allowance must be made for the impact of sampling error in the sample betas on the distribution of its mean return such analysis is extremely complicated when the number of assets included in such portfolios exceeds the number of time series observations on asset returns hence previous investigations have restricted their attention to the special case where the number of assets is taken to be smaller than the number of time series observations an enormous amount has been learned about both the statistical properties and economic interpretation of two such tests in these circumstances shanken s 1985 csr test and the related likelihood ratio test of kandel 1984 a partial list of relevant papers includes roll 1979 1985 gibbons 1982 stambaugh

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

economic volatility and returns to education in venezuela 1992 2002 preliminary evidence suggests that the rates of return to education in venezuela have been declining since the 1970s this study rigorously estimates the returns to education in venezuela for the period 1992 to 2002 and links them to earlier available estimates from the 1980s consistent cross sections from the encuesta de hogares por muestro are used to document falling returns to schooling and educational levels until the mid 1990s followed by increasing returns thereafter quantile regression analysis is used to provide further insight into the within skill group changes in returns over time

on the decomposition of wage differentials the often used method for decomposing wage differentials into human capital and discrimination components is reformulated so that both t he disadvantage or cost discrimination it imposes on a black or minority wage earner and the advantage or benefit it bestows on a white or majority wage earner can be estimated copyright 1988 by mit press

schooling and labor market consequences of school construction in indonesia evidence from an unusual policy experiment between 1973 and 1978 the indonesian government engaged in one of the largest school construction programs on record combining differences across regions in the number of schools constructed with differences across cohorts induced by the timing of the program suggests that each primary school constructed per 1 000 children led to an average increase of 0 12 to 0 19 years of education as well as a 1 5 to 2 7 percent increase in wages this implies estimates of economic returns to education ranging from 6 8 to 10 6 percent

education policy reform local average treatment effect and returns to schooling from instrumental variables in the philippines a nationally representative dataset from the philippines is used to derive returns to schooling estimates from instrumental variables utilizing a supply side intervention in the education market capable of generating significant changes in schooling these estimates apply to a subgroup of mainly liquidity constrained individuals in the spirit of the local average treatment effect late literature returns to schooling estimates which apply to a subgroup of individuals affected by policy intervention may be more interesting from a policy perspective than the return to the average individual the findings are consistent with other recent evidence suggesting that the causal effect of education at least for certain subgroups of individuals is as big or bigger than what is suggested by ols estimates

the response of household incomes to stock price and gdp growth by income quantile how household incomes respond to gdp and stock price growth is important for an understanding of the economic costs of business cycles and the driving forces of income inequality over time this article examines to what extent household incomes react differently across income distribution quantiles and time it employs u s panel study of income dynamics data for the period 1979 2000 and quantile regression techniques significant differences are found in how household incomes respond across income quantiles for the same income quantiles large differences are identified when the time period 1979 1987 is compared to 1988 2000 the content of the article reflects the personal opinion of the authors and should not be associated with fedex services or any of its affiliated companies

the quality of schooling quantity alone is misleading although much research discusses the quantity of schooling as an effective impact on productivity and earnings most such research leaves out the idea of the quality of schooling which may cause biases in the estimated returns to schooling this paper consequently attempts to extend the standard mincerian approach to incorporate school quality as well as quantity it demonstrates how exclusion of quality in the standard procedure may cause biases in the estimated returns to years of schooling probably in the upward direction the paper explores the implications of this extension of the standard model for the case of young brazilian males it shows that the estimate of the private return to years of schooling using the preferred quality inclusive specification is only one half the estimate using the standard procedure indicating substantial upward bias in the standard estimates it further outlines a method for estimating a social return to quality and finds that it exceeds substantially the social return to quantity the paper then shows why this in turn suggests there may be an equity productivity trade off in schooling investments

earnings schooling ability and cognitive skills conventional estimates now available for a large number of countries generally indicate that the social returns to education are positive large and competitive with returns to investment in physical capital that such estimates are good guides for public resource allocation has however been questioned the heart of the problem lies in the interpretation of the positive relationship between the education and the earnings of workers whether as the conventional estimates assume the coefficient of the education variable in the earnings function measures the effect on the productivity of workers of human capital acquired in school it has been hypothesized that education in part or instead represents screening for native ability and motivation or credentialism and that as a consequence conventional measures of the social benefit of education are substantially upward biased 2 in this paper we attempt to distinguish the influence on earnings of cognitive achievement native ability and years of education as a means of adjudicating the human capital screening and credentialist hypotheses our econometric analysis is based on two rigorously comparable micro data sets from kenya and tanzania generated by surveys of the urban wage labor force specifically for this study these data sets contain the usual variables found in earnings function estimates of the benefits of schooling individual earnings years of education and years of employment experience in addition they contain two variables measures of the worker s cognitive skills and of his or her reasoning ability not previously found in studies of developing countries and only rarely found in studies of the education earnings relationship in developed countries 3 with these variables we can estimate the direct effects on earnings of cognitive skills ability and years of schooling by using them to estimate educational production functions and educational attainment functions and linking these functions with the earnings function in a recursive framework we can also assess the various indirect effects on earnings of ability and years of schooling having data sets from two countries very similar with respect to size resource endowments structure of production and employment and level of development means that not only can we subject our results to the usual statistical tests but we can also assess their replicability both kenya and tanzania have nearly achieved the objective of universal primary education while university enrollments remain at less than 1 percent of the relevant age group the important policy issues re boissiere development research department the world bank 1818 h street washington d c 20433 knight institute of economics and statistics oxford university sabot williams college williamstown ma 01267 we are grateful to the educational testing service of princeton for the design of tests used in this study and to j armitage j behrman j hausman d hendry d jamison and an anonymous referee for their insights and advice helpful comments were also received from participants in seminars at oxford and yale universities the views presented here are our own they should not be interpreted as reflecting those of the world bank george psacharopoulos 1973 1981 contains a listing of 44 countries in which rate of return studies had been conducted and of the estimates obtained 2for instance kenneth arrow 1973 mark blaug 1976 samuel bowles and herbert gintis 1976 john riley 1979 michael spence 1976 and lester thurow 1975 3for attempts to control for ability and or for cognitive achievement in studies for the united states see jere behrman et al 1980 gary chamberlain and zvi griliches 1977 griliches and william mason 1972 michael olneck 1977 paul taubman and terence wales 1974 taubman 1975 and david wise 1975 see also the survey articles by griliches 1977 1979 in most instances the data refer to special subgroups in the population and clear distinction cannot be made between natural ability and cognitive skills acquired in school

within groups wage inequality and schooling further evidence for portugal this article provides further evidence on the positive impact of schooling on within groups wage dispersion in portugal using data on male workers from the 2001 wave of the european community household panel the issue of schooling endogeneity is taken into account by using the latest available instrumental variable technique for quantile regression i e the control function estimator due to lee 2007 the findings are compared with earlier results based on different techniques i e the instrumental variable estimator due to arias et al 2001 and the standard exogeneity based estimator due to koenker and bassett 1978