micro data heterogeneity and the evaluation of public policy nobel lecture this paper summarizes the contributions of microeconometrics to economic knowledge four main themes are developed 1 microeconometricians developed new tools to respond to econometric problems raised by the analysis of the new sources of micro data produced after the second world war 2 microeconometrics improved on aggregate time series methods by building models that linked economic models for individuals to data on individual behavior 3 an important empirical regularity detected by the field is the diversity and heterogeneity of behavior this heterogeneity has profound consequences for economic theory and for econometric practice 4 microeconometrics has contributed substantially to the scientific evaluation of public policy

local pay determination theoretical models of local pay are reviewed ranging from neoclassical perspectives unemployment wage trade off models and segmented labor market approaches the empirical work on u s north south differentials is discussed for the u k studies of the extent of and trends in geographical pay differentials are considered as well as behavioral explanations focusing on the role of excess demand the issue of adjustment processes is then discussed both in theory and in relation to empirical work for the u s and u k this discussion focuses largely on geographical spillover effects in terms of origins evidence and issues of identification finally the impact of certain impediments in the adjustment process are considered specifically in relation to the u k these concern the role and influence of national wage bargaining as well as factors inhibiting labor migration stemming from the housing market and the climate of the national labor market copyright 1992 by blackwell publishers ltd

race and human capital while human capital has been used with some success to analyze recent changes in racial income differences scholars have repeatedly pointed to a major empirical problem that appears to severely limit the historical relevanlce and scope of skill based theories as applied to racial questions the challenge they raise is legitimate put simply if measured skill disparities between the races narrowed throughout the twentieth century why did income ratios first begin to converge in the 1960 s in this paper i address this question relying on some unexploited census data by race on education literacy occupations and income using these data that begin with the 1890 census i present new estimates of agespecific relative income positions of black men for all postslavery birth cohorts in addition to reconciling the apparently inconsistent skill and income series these income ratios offer a very different historical record than many economists believe to have been the case to cite a prominent example gunnar myrdal s classic work 1944 saw the economic position of his contemporary black america not only as dismal but made even more so by its sense of hopelessness given the absence of any hint of progress or change while myrdal s pessimism is understandable it appears that even in his day seeds had long been sown that were already permanently altering and improving the relative economic status of black men

white discrimination in provision of black education plantations and towns abstract we present a model of public provision of education for blacks in two discriminatory regimes white plantation controlled and white yeoman town controlled we show that the ability to migrate to a non discriminating district constrains the ability of both types of regimes to discriminate the model produces time series of educational outcomes for whites and blacks that mimic the behavior seen in post reconstruction south carolina to the onset of the civil rights act it also fits the post world war ii black white income differentials

productivity gains from geographic concentration of human capital evidence from the cities abstract based on recent theoretical developments the argument is made that the average level of human capital is a local public good cities with higher average levels of human capital should therefore have higher wages and higher land rents after conditioning on the characteristics of individual workers and dwellings this prediction is supported by data for standard metropolitan statistical areas smsas in the united states where the smsa average levels of formal education and work experience are used as proxies for the average level of human capital the alternative explanations of omitted smsa variables and self selection are evaluated an estimate of the effect of an additional year of average education on total factor productivity is computed

does wealth explain black white differences in early employment careers in this article i inquire about the effects initial wealth has on black white differences in early employment careers i set up a dynamic model in which individuals simultaneously search for a job and accumulate wealth and fit it to data from the national longitudinal survey 1979 cohort regime changes and decompositions of racial differences reveal that differences in the labor market environment and in preferences account fully for racial gaps in wealth and in wages persisting several years after high school graduation differences in initial wealth partially explain differences in early employment careers

urban wages and labor market agglomeration abstract using the 5 public use micro sample of the 1990 u s census we find that observationally equivalent workers in the manufacturing sector earn higher wages when they are in urban labor markets that have a larger share of national or metropolitan employment in their same occupation and industry groups quantitatively the effect is large with an elasticity measured at the means of between 1 2 and 3 6 for these effects we interpret the willingness of firms to pay more for equivalent workers in dense markets as evidence of an agglomeration economy in urban labor

the incentive effects of inequality an experimental investigation author affiliation hyejin ku hku fsu edutimothy c salmon tsalmon smu edu acknowledgment the authors would like to thank the national science foundation for research support in funding these experiments we also thank participants at the cornell edinburgh conference on relativity inequality and public policy the international esa meeting in washington d c the european esa meeting in innsbruck and the conference on aspirations and poverty at the university of warwick as well participants in seminars at virginia commonwealth university carnegie mellon university helmut schmidt university and goethe university in frankfurt 1 introductioneconomists have established many ways in which initial inequality may influence the paths of economic development in a series of historical studies engerman and sokoloff 1997 2002 2005 argue that the initial differences in factor endowments between north and south america contributed to the emergence of different institutions between the two regions which in turn led to the divergence in the rates of growth persson and tabellini 1994 examine more recent data and argue that there is a significant and large negative relation between inequality and growth while banerjee and duflo 2003 argue that the relationship between growth and inequality is an inverted u shaped function understanding the relationship between inequality and economic growth is important in the design of a broad range of economic development policies and there is a substantial literature that investigates the mechanics behind the linkages between growth and inequality loury 1981 galor and zeira 1993 banerjee and newman 1993 durlauf 1996 benabou 1996 2000 and mookherjee and ray 2003 are well established studies in the literature and the typical nature of the proposed linkage between inequality and either growth or persistent inequality in these papers is differential endowment or investment opportunities of agents often in the form of human capital and occupational choice we propose a new possible linkage between inequality and growth which may also be useful in explaining the persistence of inequality the linkage we propose is the incentive effects of inequality from a behavioral perspective specifically we argue that individuals may respond not just to the absolute return on their effort but also to their return relative to that of others if present this effect can lead to inequality having a direct impact on the decisions of individuals unlike in the existing literature wherein it only alters aggregate societal outcomes to explain the nature of the effect we investigate suppose that as a result of identity marks such as gender caste or race an individual receives lesser rewards than others in society for the same amount of effort provided then one can envision this individual eventually becoming discouraged by repeatedly facing disadvantageous inequality and this could result in the individual exhibiting a variety of responses ranging from decreased on the job work effort to decreased human capital acquisition and decreased contributions to public goods if such a behavioral response to inequality exists then there are a number of important consequences associated with it first this effect ceteris paribus would generate a negative relationship between inequality and economic growth there are a number of forces at play in an aggregate economy so this is not to claim that the overall relationship between inequality and growth must be negative if this effect exists but the partial effect of inequality on growth due to this behavioral effect would be negative second separately or in addition to the theoretical models cited above this effect could generate persistent inequality from initial idiosyncratic inequality the reason is that even if the initial inequality were idiosyncratic if a worker responds by exerting less effort or investing less in human capital then this response has the potential to legitimize and then perpetuate the initially low rewards for that individual or group

contracts for venture capital financing with double sided moral hazard using a nash bargaining approach we analyze the financing contract between the entrepreneur and the venture capitalist with double sided moral hazard in a start up enterprise our results show that there exists an optimal contract set between the entrepreneur and the venture capitalist in which all contracts achieve an identical second best social state within the optimal contract set there exists continuum of joint debt equity financing the pure equity financing contract exists in the optimal contract set when the ratio of total social surplus to the amount of investment is greater than a threshold

human capital pricing equations with an application to estimating the effect of schooling quality on earnings this paper formulates and estimates alternative models for the pricing of labor services we present economic models that rationalize empirical specifications in the literature and we offer evidence on the validity of those specifications widely used efficiency units models of labor services are inconsistent with evidence from the u s labor market a model of heterogeneous skills provides a more accurate description of earnings data we present evidence that the pursuit of comparative advantage and selective migration are important features of the u s labor market when these features are included in the model the only support for an effect of schooling quality on earnings is through the return to college education three interactions are empirically important in explaining log wage equations a between schooling quality and education b between regional labor market shocks and education and c between region of residence and regionof birth because of this third interaction which can arise from comparative advantage in the labor market no unique quality effect on returns to education can be defined independently of the market in which it is used

divergent paths a new perspective on earnings differences between black and white men since 1940 we present new evidence on the evolution of black white earnings differences among all men including both workers and nonworkers we study two measures i the level earnings gap the racial earnings difference at a given quantile and ii the earnings rank gap the difference between a black man s percentile in the black earnings distribution and the position he would hold in the white earnings distribution after narrowing from 1940 to the mid 1970s the median black white level earnings gap has since grown as large as it was in 1950 at the same time the median black man s relative position in the earnings distribution has remained essentially constant since 1940 so that the improvement then worsening of median relative earnings have come mainly from the stretching and narrowing of the overall earnings distribution black men at higher percentiles have experienced significant advances in relative earnings since 1940 due mainly to strong positional gains among those with college educations large relative schooling gains by blacks at the median and below have been more than counteracted by rising return to skill in the labor market which has increasingly penalized remaining racial differences in schooling at the bottom of the distribution

interindustry wage differentials in brazil why workers who have seemingly identical characteristics receive different wages has been a recurrent problem in labor economics and has received much attention lately in the debate on the efficiency wage models ewms in this article we extend this line of research to a less developed economy by testing the existence of interindustry wage differentials in brazilian industries the empirical analysis is based on cross sectional data on individuals working in the manufacturing industry in sao paulo one of the greater industrial areas in brazil the brazilian case shows a number of similarities to previous studies as there is a significant and stable pattern of interindustry wage differentials however it also raises additional issues namely a relationship between technology and wages that extends beyond the size effect as well as the similarities of the wage structure across countries even when workers characteristics are controlled the results have also proven to be quite robust to methodological estimation issues that is changes in the control variables and full correction for the least squares sampling error

fast growing small entrepreneurial firms and their venture capital backers an applied principal agent analysis first the empirical background of the u k venture capital industry is developed using a panel of major u k venture capital funds over the period 1988 92 then a framework for applied principal agent analysis is developed focusing on risk management and information under risk management it explores attitude to risk risk sharing and bearing and the effects of risk bearing on effort under information handling it explores information systems information asymmetries between investor venture capitalist and investee entrepreneur and ways of attenuating them and information variance and costs finally the contract between investor and investee is seen as a device for trading risk and information the implications of this trading for risk bearing effort and efficiency are explored the whole analysis is supported by a detailed case study which reflects current practice in the u k venture capital industry the evidence provides striking confirmation of the applicability of the principal agent model to the venture capital financing of hightech ventures

the racial wage gap the importance of labor force attachment differences across black mexican and white men labor market attachment differs significantly across young black mexican and white men although it has long been agreed that potential experience is a poor proxy for actual experience for women many view it as an acceptable approximation for men using the nlsy this paper documents the substantial difference between potential and actual experience for both black and mexican men we show that the fraction of the black white and mexican white wage gaps that are explained by differences in potential experience are quite different from the fraction of the racial wage gaps that are explained by actual real experience differences

differences in wage levels among metropolitan areas less educated workers in the united states easton t and king m c 2000 differences in wage levels among metropolitan areas less educated workers in the united states reg studies 34 21 27 this work investigates the causes of low wages for workers with a high school education or less in the us using a sample of 241 metropolitan areas drawn from the 1990 census it examines the influence of five labour market characteristics on between metropolitan area wage differences labour demand the minimum wage unionization industry mix and the race gender composition of the labour force the first four factors seem to affect both men s and women s wages but the relative importance differs for example the evidence suggests that unionization is the most important influence on men s wages while for women industry mix matters most easton t et king m c 2000 des ecarts de salaire dans les zones metropolitaines les salaries moins instruits aux etats unis reg studies 34 21 27 a partir d un echantillon de 241 zones metropolitaines tirees du

separate and unequal in the labor market human capital and the jim crow wage gap competing explanations for the long standing gap between black and white earnings attribute different weight to wage discrimination and human capital differences using new data on local school quality we find that human capital played a predominant role in determining 1940 wage and occupational status gaps in the south despite entrenched racial discrimination in civic life and the lack of federal employment protections the resulting wage gap coincides with the higher end of the range of estimates from the post civil rights era we estimate that truly separate but equal schools would have reduced wage inequality by 29 48

the causes and consequences of distinctively black names in the 1960s blacks and whites chose relatively similar first names for their children over a short period of time in the early 1970s that pattern changed dramatically with most blacks particularly those living in racially isolated neighborhoods adopting increasingly distinctive names but a subset of blacks actually moving toward more assimilating names the patterns in the data appear most consistent with a model in which the rise of the black power movement influenced how blacks perceived their identities among blacks born in the last two decades names provide a strong signal of socioeconomic status which was not previously the case we find however no negative relationship between having a distinctively black name and later life outcomes after controlling for a child s circumstances at birth

an entrepreneur s choice of venture capitalist or angel financing a behavioral game theoretic approach abstract we develop a game theoretic model that analyzes the effects of economic and behavioral characteristics on an entrepreneur s choice of financier venture capitalist or angel after the entrepreneur has chosen his financier the dyad faces double sided moral hazard problems in the form of ex ante effort shirking and ex post project expropriation in making his choice of financier the entrepreneur trades off the following factors the venture capitalist has higher value creating abilities than the angel however the entrepreneur anticipates a closer more empathetic and trusting relationship with the angel entrepreneur angel empathy and trust mitigates the double sided shirking and expropriation threats our model contributes to two strands of venture capitalist research the entrepreneur s choice of financier in the face of double sided moral hazard problems and the effect of behavioral factors such as empathy and trust on the creation of relational rents

black white earnings ratios since the civil rights act of 1964 the importance of labor market dropouts published median earnings of wage and salary workers by race and sex are based on distributions that exclude those without earnings and those not employed as wage and salary workers at the time of the survey it has been argued that the changing importance of these exclusions rather than any improvement in the distribution of offered wages for blacks accounts for the apparent increase in black white relative median earnings this paper presents a new method for correcting the published medians for such censoring the apparent improvement in relative earnings is reduced but not eliminated by the correction

networks in labor markets wage and employment dynamics and inequality we present a model of labor markets that accounts for the social network through which agents hear about jobs we show that both wages and employment are positively associated a strong form of correlation across time and agents we also analyze the decisions of agents regarding staying in the labor market or dropping out if there are costs to staying in the labor market then networks of agents that start with a worse wage status will have higher drop out rates and there will be a persistent differences in wages between groups according to the starting states of their networks

what is different about urbanization in rich and poor countries cities in brazil china india and the united states abstract are the well known facts about urbanization in the united states also true for the developing world we compare american metropolitan areas with analogous geographic units in brazil china and india both gibrat s law and zipf s law seem to hold as well in brazil as in the u s but china and india look quite different in brazil and china the implications of the spatial equilibrium hypothesis the central organizing idea of urban economics are not rejected the india data however repeatedly rejects tests inspired by the spatial equilibrium assumption one hypothesis is that spatial equilibrium only emerges with economic development as markets replace social relationships and as human capital spreads more widely in all four countries there is strong evidence of agglomeration economies and human capital externalities the correlation between density and earnings is stronger in both china and india than in the u s strongest in china in india the gap between urban and rural wages is huge but the correlation between city size and earnings is more modest the cross sectional relationship between area level skills and both earnings and area level growth are also stronger in the developing world than in the u s the forces that drive urban success seem similar in the rich and poor world even if limited migration and difficult housing markets make it harder for a spatial equilibrium to develop

the effects of social networks on employment and inequality we develop a model where agents obtain information about job opportunities through an explicitly modeled network of social contacts we show that employment is positively correlated across time and agents moreover unemployment exhibits duration dependence the probability of obtaining a job decreases in the length of time that an agent has been unemployed finally we examine inequality between two groups if staying in the labor market is costly and one group starts with a worse employment status then that group s drop out rate will be higher and their employment prospects will be persistently below that of the other group

urban attributes and wage disparities in brazil a multilevel hierarchical model fontes g g simoes r f and hermeto camilo de oliveira a m urban attributes and wage disparities in brazil a multilevel hierarchical model regional studies this paper examines the effects of urban scale and productive structure on individual wage levels in brazilian cities and metropolitan areas in 1990 and 2000 the estimation through hierarchical linear models enabled the inclusion of variables in different levels individual and urban and the decomposition of total wage variance the results showed significant and huge wage disparities among workers who share similar personal attributes but live in different regions of the country in addition the disparities persisted from 1990 to 2000 finally the results provided evidence that local economic and labour market factors played an important role in wage determination

understanding black white wage differentials 1960 1990 understanding black white wage differentials 1960 1990 author s james j heckman thomas m lyons petra e todd source the american economic review vol 90 no 2 papers and proceedings of the one hundred twelfth annual meeting of the american economic association may 2000 pp 344 349 published by american economic association stable url http www jstor org stable 117248 accessed 16 08 2008 00 56

urbanization in a developing country city size and population composition abstract in developing countries typically there is a very high correlation between city size and educational attainment of the local population which is less pronounced or even absent in developed countries such as canada the u s a or the u k two explanations are examined first the types of goods produced in larger cities require relatively high skill labor inputs second public and perhaps private services demanded by higher skill people are only offered in larger cities the paper econometrically tests these hypotheses for brazil estimating the elasticities of substitution or typically complementarity between high and low skill labor and the bright lights effect for high versus low skill labor

ranking unemployment duration and wages it explores the implication of one central assumption when firms receive multiple acceptable applications they hire the worker who has been unemployed for the least amount of time this assumption ranking is contrasted with the assumption of random hiring no ranking by embodying this assumption in a model of the labour market with job creation destruction and matching the joint behaviour of unemployment the distribution of unemployment durations and wages are characterized the implication that the re employment prospects of employed workers were they to become unemployed are better than those of the currently unemployed appears to have been an important feature of european unemployment experience in the 1980 s this paper examines the effects of the composition of unemployment on wage determination it explores one central assumption when firms receive multiple acceptable applications they hire the worker who has been unemployed for the least amount of time we refer to this assumption as ranking and contrast it throughout to the assumption of random hiring or no ranking by embodying this assumption in a model of the labour market with job creation destruction and matching we characterize the joint behaviour of unemployment the distribution of unemployment durations and wages ranking has a number of important implications first in addition to the obvious result that the exit rate from unemployment is a decreasing function of duration we show that the effect of duration is stronger the higher the rate of unemployment second with the wage depending on the distributions of prospective unemployment durations the presence of long term unemployed per se has little effect on wages third looking at the relation between the wage and the aggregate level of unemployment and comparing ranking to the case of no ranking the wage moves less with the level of unemployment but more with the change in unemployment put simply ranking and no ranking models show exactly the same aggregate unemployment slightly different long run responses of wages to unemployment and sharply different wage dynamics the paper is organized as follows section i characterizes the matching process and derives a matching function based on an urn ball process with vacancies as urns and applications by unemployed workers as balls thus the distribution of applications per vacancy depends on aggregate unemployment and vacancies vacancies with at least one acceptable application are filled when a vacancy receives more than one acceptable application firms use a rule to choose among applicants thus the rule determines who is hired but does not affect the number of hires section ii uses this matching function in a model of the labour market with continual job creation and destruction and characterizes the equilibrium values of unemployment vacancies and hires

school quality and black white relative earnings a direct assessment the wage differential between black and white men fell from 40 percent in 1960 to 25 percent in 1980 it has been argued that this convergence reflects improvements in the relative quality of black schools to test this hypothesis we assembled data on pupil teacher ratios annual teacher pay and term length for black and white schools in the eighteen segregated states from 1915 to 1966 these data are linked to estimated returns to education for southern born men from different cohorts and states in 1960 1970 and 1980 improvements in the relative quality of black schools explain 20 percent of the narrowing of the black white earnings gap between 1960 and 1980