the male marital wage premium sorting vs differential pay the authors examine whether male marital and parenthood premia arise due to differential pay by employers or from differential sorting of employees on occupations and establishments they investigate these premia using matched employee employer data from the period 1979 96 in norway a country with increased pressures on men to be more active in the family sphere and in which public policy has aimed at remaking the family institution we find that the effect of marriage and to a lesser extent of children occurs mostly through sorting on occupations and occupation establishment units the role of differential pay from employers is marginal in explaining the marital and parenthood premia results assessing within individual changes in wages suggest that about 80 of the marital premium is due to selection the men who eventually marry and or have children sort into the higher paying occupations and occupation establishment units even prior to marriage and parenthood

equity and the distribution of uk national health service resources this paper examines the extent to which the british nhs allocates health care according to need the results based on 1985 data show that within morbidity groups the poor receive on average more health care than the rich this does not necessarily indicate pro poor inequity there is some evidence of a positive relationship between income and health within any morbidity category the results contradict those of an earlier study which found bias favouring the middle classes it is argued that the methodology adopted in the present study is more appropriate for the examination of allocation according to need

does marriage really make men more productive this paper presents new descriptive evidence regarding marital pay premiums earned by white males longitudinal data indicate that wages rise after marriage and that cross sectional marriage premiums appear to result from a steepening of the earnings profile data from a company personnelfile that includes information on job grades and supervisor performance ratings reveal large marital status pay differences within a narrow range of occupations managers and professionals and environments a single firm married workers tend to be located in higher paying job grades there are very small pay differentials within grades married men receive higher performance ratings than single men as a result they are much more likely to be promoted controlling for rated performance however eliminates the promotion differential sanders korenman is an assistant professor of economics and public affairs at princeton university and is a faculty associate of the office of population research at princeton university and a research affiliate of the national bureau of economic research nber david neumark is an assistant professor of economics at the university of pennsylvania and a research affiliate of the nber korenman wishes to acknowledge the hewlett foundation and the harvard university center for population studies for financial support the authors are grateful to james medofffor making available an extract from the company personnelfile questions regarding data availability should be directed to professor james

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

are those paid more really more productive the case of experience this study uses computerized personnel microdata on the white male managerial and professional employees at a major u s corporation to address the following question can the additional earnings which are associated with more labor market experience at a point in time really be explained by higher productivity at the same point in time our answer to this question based on both cross sectional and longitudinal information is that performance plays a substantially smaller role in explaining cross sectional experience earnings differentials and earnings growth than is claimed by those who have adopted the human capital explanation of the experience earnings profile this response depends critically on our assumption that the performance ratings which supervisors give to their white male managerial and professional subordinates adequately reflect the subordinates relative productivity in the year of assessment we present a great deal of evidence which strongly supports this assumption

the accumulation of human capital during marriage by males married males have significantly higher wage rates than never married widowed or divorced males even when differences in educational attainment experience race and so on are controlled for evidence presented in this paper suggests that most of the unexplained wage differential associated with marital status in earnings regressions results from males accumulating human capital more rapidly when they are married than when those same males are not married the hypothesis that married males earn more than unmarried males because marriage facilitates the financing of human capital accumulation is supported by this and other evidence

integrating marketing and production planning in make to order companies abstract make to order companies are in the business of supplying products only in response to a customer s order they may supply unique products made to a customer s specification and or a limited range of products they range from the traditional job shop e g cutting pieces of metal to a specific shape to producers of machine tools e g a vulcanising line a major problem is the divide between sales marketing and production the production function is often faced with unrealistic delivery dates for incoming orders this arises when the sales force quote delivery dates and prices which will maximise the chance of the company winning the order the lack of coordination with production often leads to confirmed orders being delivered later than promised by sales and or being produced at a loss or alternatively production has to delay other orders with consequent extra costs the need to integrate sales and production planning considerations at the customer enquiry stage in deciding how to respond has been pointed out by several authors yet little research has been carried out the paper will discuss some possible approaches to the problem these essentially depend on estimating routinely the probability of winning an enquiry order dependent on many factors including price and lead time etc companies do not traditionally keep records of this data particularly records of unsuccessful bids and on competitors in addition the paper describes the experience of setting up a system to collect such data in a major uk company and the potential uses of such a database

household specialization and the male marriage wage premium empirical research has consistently shown that married men have substantially higher wages on average than otherwise similar unmarried men one commonly cited hypothesis to explain this pattern is that marriage allows one spouse to specialize in market production and the other to specialize in home production enabling the former usually the husband to acquire more market specific human capital and ultimately earn higher wages the authors test this hypothesis using panel data from the national survey of families and households the data reveal that married men spent virtually the same amount of time on home production as did single men albeit on different types of housework estimates from a fixed effects wage equation indicate that the male marriage wage premium is not substantially affected by controls for home production activities household specialization the authors conclude does not appear to have been responsible for the marriage premium in this sample

equity and equality in health and health care this paper explores four definitions of equity in health care equality of utilization distribution according to need equality of access and equality of health we argue that the definitions of need in the literature are inadequate and propose a new definition we also argue that irrespective of how need and access are defined the four definitions of equity are in general mutually incompatible in contrast to previous authors we suggest that equality of health should be the dominant principle and that equity in health care should therefore entail distributing care in such a way as to get as close as is feasible to an equal distribution of health

the effects of sons and daughters on men s labor supply and wages in this paper we estimate the effects of children and the differential effects of sons and daughters on men s labor supply and hourly wage rates the responses to fatherhood of two cohorts of men from the psid sample are examined separately and we use fixed effects estimation to control for unobserved heterogeneity we find that fatherhood significantly increases the hourly wage rates and annual hours of work for men from both cohorts most notably men s labor supply and wage rates increase more in response to the births of sons than to the births of daughters

optimal production purchasing and pricing a differential game approach abstract this paper deals with a problem of determining optimal production and pricing policies of a manufacturing firm which is supplying a retailer the latter faces a price dependent demand function towards the final consumers and wishes to determine optimal purchasing and pricing policies both firms carry inventories and backlogging is permitted the problem is modelled as a two player nonzero sum differential game with the inventory levels as the state variables the controls are the rates of production and purchasing as well as the prices assuming linear production costs but convex ordering and holding costs open loop nash controls are characterized by using switching point analysis as well as phase diagrams

the gender gap in earnings at career entry we propose a new approach to analyzing gender differences in wages this approach identifies several alternative explanatory mechanisms to account for the sorting of women and men into different types of jobs that offer different levels of reward because labor market rewards derive from labor market positions we study matching processes operating at the micro level that sort workers into existing slots in a given macro level structure of jobs and associated wages we focus on the explanation of gender differences in wages at career entry analyzing data from the national longitudinal survey of youth collected between 1979 and 1991 we find that at career entry women earn 84 cents for every dollar men earn gender differences in worker characteristics account for only about 30 percent of this wage gap gender differences in occupational aspirations have the most important effect accounting for 16 percent of the wage gap and gender differences in job related skills and credentials account for about 14 percent of the wage gap gender differences in adult family roles have little direct effect our analysis further suggests that the external influences of employing organizations and network processes on gender differences in occupational and industrial placement at career entry account for another 42 percent of the wage gap t is well established that in the united states on average women s wages are lower than those of men data on the 1992 annual earnings of full time year round workers ages 16 and older indicate that on average women earned 71 cents for every dollar earned by men u s bureau of the census 1993 we analyze gender differences in wages at career entry when market con

production strategies for a stochastic lot sizing problem with constant capacity abstract this paper presents a single item capacitated stochastic lot sizing problem motibated by a dutch company operating in a make to order environment due to a highly fluctuating and unpredictable demand it is not possible to keep any finished goods inventory in response to a customer s order a fixed delivery date is quoted by the company the objective is to determine in each period of the planning horizon the optimal size of production lots so that delivery dates are met as closely as possible at the expense of minimal average costs these include set up costs holding costs for orders that are finished before their promised delivery date and penalty costs for orders that are not satisfied on time and are therefore backordered given that the optimal production policy is likely to be too complex in this situation attention is focused on the development of heuristic procedures in this paper two heuristics are proposed the first one is an extension of a simple production strategy derived by dellaert 5 for the uncapacitated version of the problem the second heuristic is based on the well known silver meal algorithm for the case of deterministic time varying demand experimental results suggest that the first heuristic gives low average costs especially when the demand variability is low and there are large differences in the cost parameters the silver meal approach is usually outperformed by the first heuristic in situations where the available production capacity is tight and the demand variability is low

unfair inequalities in health and health care inequalities in health and health care are caused by different factors measuring unfair inequalities implies that a distinction is introduced between causal variables leading to ethically legitimate inequalities and causal variables leading to ethically illegitimate inequalities an example of the former could be life style choices an example of the latter is social background we show how to derive measures of unfair inequalities in health and in health care delivery from a structural model of health care and health production direct unfairness linked to the variations in medical expenditures and health in the hypothetical distribution in which all legitimate sources of variation are kept constant fairness gap linked to the differences between the actual distribution and the hypothetical distribution in which all illegitimate sources of variation have been removed these two approaches are related to the theory of fair allocation in general they lead to different results we propose to analyse the resulting distributions with the traditional apparatus of lorenz curves and inequality measures we compare our proposal to the more common approach using concentration curves and analyse the relationship with the methods of direct and indirect standardization we discuss how inequalities in health care can be integrated in an overall evaluation of social inequality

marital status child rearing and earnings differentials in the graduate labour market differential the importance of family role specialisation for the measurement of the residual earnings differential is examined within a sample selection model of participation and earnings the earnings differential between men and women may be divided into that explained by different characteristics and attributes and that due to residual factors one element of this residual may be discrimination although other factors may be incorporated in the unexplained component the residual also incorporates the effects on earnings associated with the production of home goods see polachek ig75 a b these will occur

new evidence on sex segregation and sex differences in wages from matched employee employer data we use new matched employer employee data to estimate the contributions of sex segregation and wage differences by sex within occupation industry establishment and occupation establishment cells to the overall sex gap in wages in contrast to earlier data used to study this question our data cover all industries and occupations across all regions of the united states we find that segregation of women into lower paying occupations industries establishments and occupations within establishments accounts for a sizable fraction of the sex gap in wages nonetheless approximately one half of the sex gap in wages remains attributable to the individual s sex

unobservable individual effects marriage and the earnings of young men i introduction married men earn more than unmarried men this fact is unassailable and is robust across data sets and over time two common explanations of the married male wage premium are i the division of labor in a married household which allocates more of the man s time to the market and ii lower cost human capital acquisition for married men both of these stories view marriage as productivity enhancing kenny 1983 provides some evidence that marriage facilitates human capital acquisition however the potential endogeneity of marital status is ignored furthermore the argument that marriage makes it cheaper to accumulate human capital is difficult to reconcile with the fact that individuals who acquire more formal education tend to marry later than those who acquire less bergstrom and schoeni 1992 an alternative explanation for the marriage premium is that marriage signals certain unobservable individual characteristics such as ability honesty loyalty dependability and determination that are valued in both the labor and marriage markets l although i and ii are quite different in terms of their behavioral content they do share a common thread whether marriage per se increases productivity or high productivity men are more likely to be married marital status should not be treated as an exogenous determinant of the wage rate nevertheless in most wage regressions that control for marital status it is assumed to be exogenous resulting in an estimated marriage premium that is biased upward two exceptions are nakosteen and zimmer 1987 and korenman and neumark 1991 although both papers base their empirics on samples of young men they come to very different conclusions regarding the size and source of the marriage premium nakosteen and zimmer find the marriage premium to be insignificantly different from zero and claim that marriage does not make men more productive korenman and neumark kn present evidence that the marriage premium is at least 15 and rises with years married indicating that marriage may be productivity enhancing in this paper we reexamine the empirical relationship between marriage and wages using a sample drawn from the 1971 1976 1978 and 1980 waves of the national longitudinal survey of young men nlsym our data set is an extension of the one used by kn whose empirical work is based on the 1976 1978 and 1980 waves of the nlsym 2 our results may be summarized as follows estimates of the marriage premium derived from fixed effects models which control for unobserved heterogeneity are uniformly smaller than those obtained from random effects models and other cross section approaches that do not specification tests reject the latter and suggest that the individual effects are positively correlated with both marriage and wages conditional on labor market experience job tenure and year effects time spent in marriage has no significant effect on wages this stands as evidence against any dynamic productivity enhancing effect of marriage we conclude that whatever the source the marriage premium is a pure intercept shift and no more than 5 to 7 further support for this conclusion comes from the relationship between prospective marriage and wages using our longer panel we construct a to be married variable which identifies men who marry sometime during the sample period men who are not married in 1971 but who will be earn at least as much as those who are already married finally an interesting related result is the robust and significant effect of children on wages conditional on marital status and years married the presence of children raises wages about 5 regardless of the estimator employed we interpret the effects of marriage and children on wages similarly as structural breaks in the wage generating process involving adjustments in market work and homework among other things

is there a wage bonus from drinking unobserved heterogeneity examined while the result that drinkers earn more than abstainers has been remarkably persistent only one paper in the literature on drinking and earnings has been written where individual fixed effects are included this study improves the current literature by utilizing a much longer panel and focuses on the low end of drinking while controlling for unobserved heterogeneity with the inclusion of individual specific effects it is found that while ols specifications yield a positive significant coefficient on current drinking even when a rich set of covariates is controlled for including individual fixed effects renders the coefficient statistically insignificant

marketing production decisions in an industrial channel of distribution this paper presents a model that considers the interface between marketing and production decisions in a channel of distribution of industrial goods comprised of a manufacturer and a distributor the key issue investigated is the nature of the coordination within the channel in light of an unstable pattern of seasonal demand the investigation which focuses on dynamic issues considers production activities such as product delivery and inventory policy and their link to marketing strategies such as pricing policies the focus here is on the dynamic nature of the coordinational aspects of the various policies for example the following questions are addressed what is the distributor s pricing strategy throughout the season what is the nature of the contractual price in the channel under what conditions should the distributor carry no inventory throughout the seasonal period under what conditions should the manufacturer carry no inventory what is the impact of the seasonal parameters and differing h

due date dd quotation and capacity planning in make to order companies results from an empirical analysis the current competitive context puts manufacturers under increasing pressure to provide products and services that meet the particular requirements of individual customers calling for high flexibility in business processes the complexity and the uncertainty of demand are particularly high in customized contexts such as the make to order mto and engineer to order eto sectors where the ability to deal with more and more differentiated requirements in terms of product features delivery lead time and cost is crucial in order to be competitive in such a context due date dd quotation and capacity evaluation at the customer enquiry stage are of strategic importance having a large impact on the company performance despite the large impact on company performance the importance of dd setting and order acceptance processes and related decisions is often underestimated in practice and the issue is underexposed in the literature as the applicability of most of the proposed models is limited and there are too few empirical studies describing the practices adopted for capacity and delivery lead time management in industrial contexts this study is aimed at developing an understanding of these practices based on a sample of 15 italian capital goods manufacturers an interpretative framework is proposed in order to identify the main contextual factors impacting company choices a model that formalizes the decision process for setting dds in the analyzed cases is then proposed suggesting different procedures depending on the type of enquiry submission dd set by companies or customers and customer order fast or slow

why the gender gap in wages narrowed in the 1980s since 1976 the gender gap in wages on average declined by about 1 per year this article focuses on identifying the factors underlying this trend three data sets are analyzed the current population survey the panel study of income dynamics and the national longitudinal survey we find that convergence in measurable work related characteristics schooling and work experience explains one third to one half the narrowing the remainder is attributable to a relative increase in women s returns to experience as well as to declining wages in blue collar work and other factors

a reconsideration of the fatherhood premium marriage coresidence biology and fathers wages past research that asserts a fatherhood wage premium often ignores the heterogeneity of fathering contexts i expect fatherhood to produce wage gains for men if it prompts them to alter their behavior in ways that increase labor market productivity identity theory predicts a larger productivity based fatherhood premium when ties of biology coresidence with the child and marriage to the child s mother reinforce one another making fatherhood and the role of financial provider in particular salient high in commitment and clear employer discrimination against fathers in less normative family structures may also contribute to variation in the fatherhood premium using fixed effects models and data from the 1979 cohort of the national longitudinal survey of youth nlsy79 i find that married residential biological fatherhood is associated with wage gains of about 4 percent but unmarried residential fathers nonresidential fathers and stepfathers do not receive a fatherhood premium married residen

marital status and earnings of young men a model with endogenous selection it is a matter of course in applied labor economics to presume that marital status is a predetermined contributor to earnings among young males we find no evidence to support that proposition we estimate a model of earnings determination that permits endogenous selection of marital status our estimates are based on a sample of young employed males from the michigan panel survey of income dynamics they indicate that marital status viewed in this manner does not significantly shift the mean earnings profile our sensitivity tests indicate that this conclusion is robust with respect to a variety of alternative specifications excerpt

are all the good men married uncovering the sources of the marital wage premium a longstanding and yet unsettled question in labor economics is does marriage cause men s wages to rise cross sectional wage studies consistently find that married men earn significantly higher wages than do men who are not currently married however it is well known that inferring causal relationships from crosssectional analysis is inappropriate because of the biases introduced by unobserved heterogeneity as a means of circumventing this problem this paper uses data on identical twins to control for unobserved heterogeneity our estimates suggest that marriage increases men s wages by as much as 27 and that little if any of the cross sectional relationship between marriage and wages is due to selection in addition we find little evidence that the marital wage premium is a consequence of household specialization

the impact of employer provided health insurance on dynamic employment transitions we estimate the impact of employer provided health insurance ephi on the job mobility of males over time using a dynamic empirical model that accounts for unobserved heterogeneity previous studies of job lock reach different conclusions about possible distortions in labor mobility stemming from an employment based health insurance system a few authors find no evidence of job lock although most find reductions in the mobility of insured workers of between 20 and 40 percent we use data from the national longitudinal survey of youth which includes variables describing the health insurance an individual holds as well as whether he is offered insurance by his employer this additional information allows us to model the latent individual characteristics that are correlated with the offer of ephi the acceptance of ephi and employment transitions our results provide an estimate of job lock unbiased through correlation with positive job characteristics and individual specific turnover propensity we find no evidence of job lock among married males and produce small estimates of job lock among unmarried males of between 10 and 15 percent

why do married men earn more productivity or marriage selection injae lee using data from the current population survey march supplement 1999 this study examines why married men earn more than men who have never married we find that the marriage wage premium cannot be attributed to the unobservable higher earnings capability of married men instead wage gains from marriage are explained by the degree of specialization within the household our findings cast doubt on the argument that the selection of high ability men into marriage is the cause of the marriage wage premium jel j12 j31 i introduction labor economists have devoted considerable effort to explaining why married men earn higher wages than men who have never married a number of theoretical hypotheses have been advanced to explore the nature of this marriage wage premium the dominant theory is the productivity hypothesis which argues that marriage makes men more productive becker 1991 married men have greater opportunities to specialize in labor market activities when their wives specialize in home production the marriage wage premium reflects a productivity gap between married and never married men stemming from different conditions for human capital accumulation in market work a competing argument is the selection hypothesis nakosteen and zimmer 1987 1997 this reverses the direction of causality proposing that men with a higher earnings capability are valued more in the marriage market and are thus more likely to marry the marriage premium mirrors the marriage selection pattern married men are more productive not because they become more productive after marriage but because they were more productive before marriage 1 while there is compelling evidence that married men have higher earnings than never married men hill 1979 the relative merits of the productivity and selection arguments in explaining the existence of the marriage premium remain to be established nakosteen and zimmer 1987 argue that the marriage premium is a statistical artifact arising from a sorting process in which high wage males tend to be selected into marriage when selection effects are accounted for in their wage regression the marriage premium remains numerically large but becomes statistically insignificant however korenman and neumark 1991 show that the selection hypothesis is an incomplete explanation of the marriage premium they find that less than one half of the marriage premium vanishes when unobservable individual factors affecting both wages and marriage are removed the remaining premium is interpreted as the productivity enhancing effects of marriage later studies examine the validity of the productivity explanation using measures for the household division of labor such as a wife s labor market hours and the number of children in the household the studies investigate the effects of household specialization on a husband s earnings according to the productivity hypothesis men whose wives specialize in home production should have a larger premium than men whose wives work in the labor market the evidence for this is mixed daniel 1992 and gray 1997 find that the marriage premium is negatively associated with the wife s labor market hours whereas loh 1996 and jacobsen and rayack 1996 find little evidence that the marriage premium is explained by productivity differences past work tries to clarify the relationship between marriage household specialization and a husband s earnings but it does not allow us to reach an empirical consensus about the cause of the marriage premium in this article we present a new empirical framework to test the relative merits of two competing but not mutually exclusive hypotheses first we develop a switching regression model with endogenous marriage selection the selection hypothesis is founded on the premise that a man s attractiveness as a potential mate depends upon his observed earnings as well as unobservable individual traits that are positively related to his earnings potential

the fall in men s return to marriage declining productivity effects or changing selection historically one of the most robust findings from human capital wage equations has been that married men earn more than men who never marry however the earnings premium paid to u s married compared with never married men declined by more than 40 percent during the 1980s data from the national longitudinal surveys young men and youth cohorts are used to explore two competing explanations for this decline changes in the selection of high wage men into marriage and changes in the productivity effects of marriage due to declining specialization within households the results suggest that the drop in the marriage wage premium was due largely to a decline in the productivity effects associated with marriage instrumental variables estimation suggests that these declining productivity effects can be explained by a reduction in the average degree of specialization across households coupled with an increase in the wage penalty associated with wives labor market hours excerpt

is there a male marital wage premium new evidence from the united states this study reconsiders the phenomenon that married men earn more money than unmarried men a key result of the research on marriage benefits many earlier studies have found such a male marital wa

evolution of the marriage earnings gap for women abstract using survey of income and program participation sipp panels linked to social security earnings records we examine the earnings gap associated with marriage for cohorts of women born between 1936 and 1975 we compare ordinary least squares and fixed effect estimates we find that among women who work the marital earnings gap has all but disappeared in fixed effects estimates for recent birth cohorts in fact among women without children married women earn more than single women implying a diminished role for specialization when children are not present in contrast the motherhood earnings gap remains large even for recent birth cohorts

longitudinal analyses of the effects of trade unions but union members are different from nonmembers in unobserved ways biasing your estimates y ou should make a selectivity bias correction simultaneously determine union status and economic outcomes develop an unobservables model use longitudinal data archetypical comment on virtually any study of the economic effects of umomsm or suitably modified on any other empirical subject

marriage and wages a test of the specialization hypothesis we investigate the relationship between marriage and wages among men in britain using panel data our econometric specifications allow for observed and unobserved heterogeneity and explicitly test the role of intra household specialization in explaining the observed relationship our estimates provide evidence for the existence of large selection effects into marriage based on observable and unobservable characteristics that are positively correlated with wages after accounting for individual specific time invariant effects and a wide range of individual household job and employer related characteristics we find a statistically significant premium that can be attributed to productivity differences largely resulting from intra household specialization

examining the wage differential for married and cohabiting men leslie s stratton i introduction wage analyses almost universally indicate that married men earn more than do single men even after controlling for observable human capital characteristics the same appears to be true for cohabiting men research has failed as yet to reach a consensus regarding the nature of these differentials the evidence is consistent with a number of alternative explanations first marriage could increase men s market productivity because economies of scale and increased specialization within a multiperson household give them more time and energy to devote to market related activities if this is the mechanism driving the marital wage differential then cohabiting men may also experience a wage boost albeit a smaller one as cohabitation is a less stable relationship and less likely to engender specialization wages could jump at the start of a relationship but an increased focus on market related activities is more likely to cause wages to rise at a faster pace alternatively men who marry or cohabit may be inher ently different from men who do not if men are selected into relationships based on their earnings ability then cross section wage analyses will indicate a wage differential for married and cohabiting men but difference estimation will not the goal of this analysis is to shed light on the nature of the marital and cohabitation wage premiums for men by estimating wage models that permit both differential wage growth and selection effects ii literature review evidence of a marital wage premium for men abounds a thorough literature review is beyond the scope of this article but incorporation of a marital dummy in wage specifications for men is fairly standard hill 1979 provides one much cited work empirical estimates in the range of 10 to 30 are typical a number of researchers have explored the nature of this wage differential one explanation focuses on the marital decision itself the argument being that men who are inherently more productive are more sought after marriage partners and hence more likely to marry this is the selection model attempts such as that by nakosteen and zimmer 1987 to estimate a model in which marital status and wages are endogenously determined have yielded inconclusive results and are sensitive to identification restrictions an alternative approach less subject to specification error is to estimate a fixed effects specification that eliminates all individual specific time invariant characteristics 1 researchers korenman and neumark 1991 bartlett and callahan 1984 daniel 1991 and gray 1997 have employed this technique and continue to observe a significant marital wage differential indicating that selection effects do not explain the entire differential gray 1997 finds some evidence that the premium has declined over time as he does not find a significant marital wage differential using data from the national longitudinal survey of youth nlsy the most recent cohort of data tested however daniel 1991 also uses data from the nlsy and he finds a significant marital wage differential of about the same magnitude as that obtained from older cohorts generally speaking a comparison of cross section and panel results suggests that less than 20 of the marital wage differential is attributable to individual specific components or selectivity if selection alone does not explain the differential then wages must increase following marriage wages could be higher because they jump or because they rise more rapidly following marriage empirical estimates reported by kenny 1983 using the coleman rossi retrospective life histories study and by korenman and neumark 1991 loh 1996 and gray 1997 using the national longitudinal study of young men suggest that the growth rate of wages increases on marriage once again results from the nlsy are mixed with daniel 1991 finding faster wage growth following marriage and gray 1997 finding no marital wage differential

from motherhood penalties to husband premia the new challenge for gender equality and family policy lessons from norway given the key role that processes occurring in the family play in creating gender inequality the family is a central focus of policies aimed at creating greater gender equality we examine how family status affects the gender wage gap using longitudinal matched employer employee data from norway 1979 96 a period with extensive expansion of family policies the motherhood penalty dropped dramatically from 1979 to 1996 among men the premia for marriage and fatherhood remained constant in 1979 the gender wage gap was primarily due to the motherhood penalty but by 1996 husband premia were more important than motherhood penalties

pricing and lead time decisions for make to order firms with contingent orders abstract make to order mto firms have few standard products and volatile difficult to predict demand a production order usually stems from a successful bid which presents the mto firm s terms including price and lead time to satisfy a prospective customer s stated requirements the customer may decide to accept reject or modify these terms until the customer decides the tendered bid is a contingent demand on the mto firm s future production capacity in the short run this capacity may be relatively fixed and if the customer awards the contract to another bidder it may simply go to waste to hedge against this possibility the mto firm can bid on other projects that require the same capacity however this strategy introduces a new source of lead time uncertainty if two or more booked orders must contend for the same resources some work will inevitably be bumped to later time periods thus a hedging strategy carries the risk of penalties for late deliveries in this paper we model this little discussed source of lead time uncertainty and introduce a technique that simultaneously optimizes pricing and lead time decisions for mto firms with contingent orders we illustrate the procedure with a simple numerical example

the accumulation of dis advantage the intersection of gender and race in the long term wage effect of marriage a sizable literature examines whether and why marriage affects men s and women s wages this study advances current research in two ways first whereas most prior studies treat the effect of marri