market contagion evidence from the panics of 1854 and 1857 to test a model of contagion where individuals hear some bad news and communicate it to their acquaintances who then pass it on leading to a market panic requires a knowledge of the information networks of participants something hitherto unavailable for two panics in the 1850s this paper examines the behavior of irish depositors in a new york bank as recent immigrants their social network was determined largely by their place of origin in ireland and where they lived in new york during both panics this social network turns out to be the prime determinant of behavior

licensing of university inventions the role of a technology transfer office abstract we develop a theoretical model to explain the specific role of technology transfer offices ttos in licensing university inventions using a framework where firms have incomplete information on the quality of inventions we develop a reputation argument for the tto to reduce the asymmetric information problem our results indicate that a tto is often able to benefit from its capacity to pool innovations across research units and to build a reputation within universities we identify when the technology seller will have an incentive to shelve some of the projects thus raising the buyer s beliefs on expected quality this results in fewer but more valuable innovations being sold at higher prices we explain the importance of a critical size for the tto to be successful as well as the stylized fact that ttos may lead to fewer licensing agreements but higher income from innovation transfers

ethnicity neighborhoods and human capital externalities the socioeconomic performance of today s workers depends not only on parental skills but also on the average skills of the ethnic group in the parents generation or ethnic capital this paper investigates the link between the ethnic externality and ethnic neighborhoods the evidence indicates that residential segregation and the external effect of ethnicity are linked partly because ethnic capital summarizes the socioeconomic background of the neighborhood where the children were raised ethnicity has an external effect even among persons who grow up in the same neighborhood when children are exposed frequently to persons who share the same ethnic background copyright 1995 by american economic association

the math gender gap the role of culture this paper investigates the effect of gender related culture on the math gender gap by analysing math test scores of second generation immigrants who are all exposed to a common set of host country laws and institutions we find that immigrant girls whose parents come from more gender equal countries perform better relative to similar boys than immigrant girls whose parents come from less gender equal countries suggesting an important role of cultural beliefs on the role of women in society on the math gender gap the transmission of cultural beliefs accounts for at least two thirds of the overall contribution of gender related factors

black residential centralization and the spatial mismatch hypothesis abstract black residential centralization is found to be an important determinant of black employment status when estimated across metropolitan areas mas to avoid neighborhood selection the effects are greatest in large mas for the young and elderly and for individuals with less than a college education instrumental variable iv estimates support ordinary least squares ols results black residential centralization can account for 48 62 of the black white employment differential among 18 30 year olds living in large mas when estimated together black residential centralization job centralization and segregation all have large effects but the effects of black centralization and job centralization are considerably larger

community membership aspirations the link between inequality and redistribution revisited the issue at stake is to explain why redistributive policies may vary so greatly for a given distributional skewness to this end we abandon the stylized median voter and study how distributional tensions can act in many different ways depending on social affinity between the different economic classes and their prospect of upward or downward mobility in particular we consider that socioeconomic group membership through its implied social interactions and peer effects is an important determinant of an individual s outcome hence agents while voting on a social contract must take into account the consequences of their choice over their ex post belonging to a particular community this allows us to shed light on how the endogenous sorting of the population into clusters may interact with the balance of political power leading to a non monotonic relationship through the pattern of community formation in the economy between inequality and the pressure for redistributive policies

social networks and technology adoption in northern mozambique despite their potentially strong impact on poverty agricultural innovations are often adopted slowly using a unique household dataset on sunflower adoption in mozambique we analyse whether and how individual adoption decisions depend upon the choices of others in the same social networks since farmers anticipate that they will share information with others we expect farmers to be more likely to adopt when they know many other adopters dynamic considerations however suggest that farmers who know many adopters might strategically delay adoption to free ride on the information gathered by others we present empirical evidence that shows that the relationship between the probability of adoption and the number of known adopters is shaped as an inverse u in line with information sharing the network effect is stronger for farmers who report discussing agriculture with others the data contains information which is needed to ameliorate the identification issues that commonly arise in this context in particular social networks are precisely identified and in addition we can control for village heterogeneity and endogenous group formation

street crime and street culture a model shows how reputation concerns can support widespread street crime a street culture where the direct incentives for such behavior are weak there are social benefits to street reputations but those benefits are dominated when reputation concerns draw into crime those who obtain no direct gain from it the model matches facts about violent crime that a standard model cannot easily explain including low monetary returns disproportionate victimization of the young and poor and high variance in rates across small distances the model generates novel implications for policy and social science including a negative effect of social capital

like grand parent like child multigenerational mobility across the eu abstract this study shows that the multigenerational transmission of inequality in most of the 28 eu countries is higher than what a parent to child paradigm would suggest while a strand of the literature claims that this is due to a direct grandparental effect economic historian gregory clark argues that multigenerational mobility follows a markovian process in his view not only are previous estimates severely attenuated by an errors in variables problem but persistence is also constant across time and space using a unique retrospective survey containing information on three generations of european citizens we provide suggestive evidence against such a universal law of mobility while estimates based on measurement error models show that persistence is indeed as strong as clark suggests there are cross country differences furthermore for a few eu countries we cannot reject the hypothesis of a direct grandparental effect overall there is no single data generating process to describe multigenerational persistence that fits all eu countries 2

information flows and social externalities in a tanzanian banana growing village this article analyses the role of social networks as facilitators of information flows and banana output increase based on a village census full information is available on the socio economic characteristics and banana production of farmers kinship group members neighbours and informal insurance group members the census data enable us to use individual specific reference groups and include exogenous group controls to tackle standard difficulties related to identification and omitted variables bias when analysing social effects for the survey village of nyakatoke in tanzania the results suggest that information flows exist within all types of groups analysed but output externalities are limited to kinship groups using networks may offer scope for effective information flows on agricultural techniques but our evidence suggests that not just any local network will have a social externality impact requiring a clear understanding of local social networks for maximum impact

socially optimal social security and education subsidization in a dynastic model with human capital externalities fertility and endogenous growth abstract this paper considers socially optimal government policies in a dynastic family model with physical capital human capital endogenous fertility and positive spillovers from average human capital such spillovers reduce human capital investment but raise fertility from their social optimum we first characterize the social optimum with a non convex feasible set due to the quantity quality tradeoff concerning children we then show that social security and education subsidization together financed by labor income taxes can fully eliminate the efficiency losses of the spillovers and achieve the social optimum under plausible conditions however none of the policies can do so alone

unequal societies income distribution and the social contract this paper develops a theory of inequality and the social contract aiming to explain how countries with similar economic and political fundamentals can sustain such different systems of social insurance fiscal redistribution and education finance as those of the united states and western europe with imperfect credit and insurance markets some redistributive policies can improve ex ante welfare and this implies that their political support tends to decrease with inequality conversely with credit constraints lower redistribution translates into more persistent inequality hence the potential for multiple steady states with mutually reinforcing high inequality and low redistribution or vice versa

sixty years after the magic carpet ride the long run effect of the early childhood environment on social and economic outcomes this paper estimates the effect of the early childhood environment on a large array of social and economic outcomes lasting almost 60 years to do this we exploit variation in the living conditions experienced by yemenite children after being airlifted to israel in 1949 we find that children who were placed in a more modern environment i e with better sanitary and infrastructure conditions were more likely to obtain higher education marry at an older age have fewer children and work at age 55 they were also more likely to be assimilated into israeli society to be less religious and have more worldly tastes in music and food however these effects are found mainly for women and not for men we also find an effect on the next generation children who lived in a better environment grew up to have children with more education

education and ethnicity in canada an intergenerational perspective ethnic and intergenerational aspects of human capital investment are explored levels of and cross sectional returns to education across ethnic groups in canada are estimated and large differences observed for men a positive correlation exists between ethnic group average years of education and its return we also find large negative correlations between ethnic group average educational outcomes and the previous generation s fertility suggesting a role for home production as a complement to formal education and supporting models of child quantity quality trade offs very slow intergenerational convergence in ethnic group level educational and labor market outcomes is also observed

the long run consequences of living in a poor neighborhood author s oreopoulos philip abstract many social scientists presume that the quality of the neigborhood to which children are exposed affects a variety of long run social outcomes i examine the effect on the long run labor market outcomes of adults who were assigned when young to substantially different public housing projects in toronto administrative data are matched to public housing addresses to track children from the program for over 15 years the main finding is that neighborhood quality plays little role in determining a youth s adult earnings education attainment or welfare participation but does affect exposure to crime while living in contrasting housing projects cannot explain large variances in labor market outcomes family differences as measured by sibling outcome correlations account for up to 30 percent of the total variance in the data

political business cycles and macroeconomic credibility a survey there is clear evidence that government popularity and election performance is affected in part by economic performance suggesting that governments may manipulate the economy to political advantage simple models incorporating adaptive expectations which allowed the government to exploit this relationship were developed in the 1970s but fell out of fashion with the advent of new classical economics however modern theories of the political business cycle which are closely related to the macroeconomic policy game literature assume rational expectations and lead to forms of political business cycle driven by the existence of uncertainty of one type or another the international evidence suggests that some aspects of the theories apply although definitive conclusions are as we might expect hard to come by

keeping the doctor away experimental evidence on investment in preventative health products household investment in preventative health products in developing countries is typically low even though the returns to such products are high in this paper we experimentally estimate demand curves for health products and test whether 1 information about health risk 2 cash liquidity 3 peer effects and 4 intra household differences in preferences affect demand in our main experiment in kenya involving children s shoes critical for preventing hookworm infection price is by far the most important predictor of purchase providing liquidity and targeting women also increased demand information had no effect even though we find that genuine learning occurred we find no peer effects even though people discussed the product purchase decision extensively we find similar results for price and information in three smaller studies in guatemala india and uganda in experiments involving soap and multivitamins

ethnic enclaves and immigrant labor market outcomes quasi experimental evidence i examine the effects of the ethnic enclave size on labor market outcomes of immigrants i account for ability sorting into enclaves by exploiting a danish spatial dispersal policy under which refugees were randomly dispersed across locations first i find strong evidence that refugees with unfavorable unobserved characteristics self select into ethnic enclaves second a relative standard deviation increase in the ethnic enclave size increases annual earnings by 18 on average irrespective of skill level third further findings are consistent with the explanation that ethnic networks disseminate job information which increases the job worker match quality and thereby the hourly wage rate

social contacts and occupational choice social contacts help workers to find jobs but those jobs need not be in the occupations where workers are most productive hence social contacts can generate mismatch between a worker s occupational choice and his comparative productive advantage thus economies with dense social networks can exhibit apparently low labor force quality and as a result low returns to firms investment and depressed aggregate productivity we employ us and european data for the 1990 s to test the key prediction that social contacts distort workers occupational choices in a direction that reduces their apparent productivity we find that the use of social contacts helps find jobs one to two months sooner but leads to individual wage discounts of 5 to 7 and produces negative externalities on aggregate productivity

the pursuit of opportunity explaining selective black migration abstract this paper examines the destination choices of black migrants during the great migration as previous research has shown educated blacks were more likely to relocate to the north in the pre world war ii era this analysis shows that this tendency can be attributed to the better educated migrants ability to finance transportation costs greater responsiveness to intercity wage differentials and stronger distaste for southern disamenities after 1940 the destination choice gap closed largely because migrant responses to wage differentials and valuation of southern disamenities changed these changes are observed both in the population at large and within birth year cohorts

job information networks neighborhood effects and inequality this paper explores the theoretical and empirical literature to examine the use by different social groups of informal sources of information provided by friends relatives and acquaintances during job search and its consequences for the job market it also addresses the role of network structure and size the resource endowments of contacts and nature of the links between contacts to explain differences in the effects of job information networks in doing so the paper also turns to the sociology literature on job information networks and provides an economic perspective on such sociological concepts as strong versus weak ties inbreeding distance from structural holes etc the paper distinguishes between models of exogenous job information networks that is where individuals obtain job related information through a given social structure and endogenous job information networks which are social networks that result from individuals uncoordinated actions the paper pays special attention to such issues as physical and social proximity and sharing of information and discusses them in the context of the recent social interactions and neighborhood effects literature finally the paper outlines a model that integrates job information networks where interactions occur in business cycle frequencies with the dynamics of human capital formation which include the joint effects of parental community and neighborhood human capital and are set in life cycle frequencies for the purpose of organizing suggestions for future research and examining earned income inequality

growth divergence due to spatial externalities abstract on using household level panel data to unpack a regional growth regression for rural china we find that aggregate divergence at the regional level is entirely due to external effects of community wealth at the household level

government debt and economic growth in an overlapping generations model prior studies have shown that an increase in government debt raises the real interest rate and lowers the rate of economic growth in an overlapping generations model of endogenous growth this paper shows that an increase in government debt may not increase the real interest rate with the real interest rate being greater than the growth and that an introduction of government debt will increase the growth rate of per capita output if the growth rate is greater than the real interest rate and will decrease the growth rate if the growth rate is less than the real interest rate recent decades have seen a large increase in the share of government debt in national income in many countries this paper develops an endogenous growth model of overlapping generations to examine the effect of government debt on the rate of economic growth most prior studies of the effects of government policies on economic growth have assumed that government debt is absent romer 1986 jones and manuelli 1990 king and rebelo 1990 and rebelo 1991 showed that when government spending is not productive an increase in the income tax rate will lower the rate of per capita output growth 2 barro 1990 showed that an increase in government spending may either increase or decrease the rate of growth in a model with productive government spending government debt was incorporated in endogenous growth models by king 1992 and van der ploeg and alogoskoufis 1994 king 1992 developed a model of endogenous growth and showed that a necessary condition for the feasibility of perpetual debt finance is that labor s share of income must be greater than two thirds van der ploeg and alogoskoufis 1994 developed a blanchard type overlapping generations og model of endogenous growth and found that an increase in government debt arising from an intertemporal shift in taxation reduces the growth rate this paper analyzes the effect of government debt by developing a diamond type of og

a measure of segregation based on social interactions we develop an index of segregation based on two premises 1 a measure of segregation should disaggregate to the level of individuals and 2 an individual is more segregated the more segregated are the agents with whom she interacts we present an index that satisfies 1 and 2 and that is based on agents social interactions the extent to which blacks interact with blacks whites with whites etc we use the index to measure school and residential segregation using detailed data on friendship networks we calculate levels of within school racial segregation in a sample of u s schools we also calculate residential segregation across major u s cities using block level data from the 2000 u s census

robust determinants of intergenerational mobility in the land of opportunity abstract this paper revisits the influential work by chetty et al 2014 who attempt to explain the variation in intergenerational mobility across commuter zones in the us i e spatial mobility using nine classes of variables we employ bayesian model averaging methods that allow for model uncertainty to identify robust predictors of spatial mobility in doing so we pay special attention to the specification of model and parameter priors we also investigate the heterogeneous effects of these predictors on spatial mobility across commuter zones in different average income quintiles our findings suggest a more nuance and complex characterization of the spatial mobility process than that proposed by chetty hendren kline and saez

family values and the regulation of labor flexible labor markets requires geographically mobile workers to be e cient otherwise rms can take advantage of the immobility of workers and extract monopsony rents in cultures with strong family ties moving away from home is costly thus individuals with strong family ties rationally choose regulated labor markets to avoid moving and limiting the monopsony power of rms even though regulation generates lower employment and income empirically we do nd that individuals who inherit stronger family ties are less mobile have lower wages are less often employed and support more stringent labor market regulations there are also positive cross country correlations between the strength of family ties and labor market rigidities finally we nd positive correlations between labor market rigidities at the beginning of the twenty rst century and family values prevailing before world war ii which suggests that labor market regulations have deep cultural roots

schooling and economic growth a king rebelo experiment with human capital abstract education is added to the standard neoclassical growth model by calibrating a human capital technology to the empirical evidence on schooling simulation experiments patterned after king and rebelo 1993 american economic review 83 908 931 are conducted when agents act as if they are infinitely lived interest rates are too high and the rise in school spending is too weak over the transitional growth path when schooling is inefficiently low due to binding intergenerational credit constraints interest rates deviate only moderately from the steady state level and the historical rise in school spending is fully explained

human capital and interethnic marriage decisions common explanations for the generally negative relationship between education and ethnic endogamy include 1 education makes immigrants and their children better able to adapt to native culture thereby eliminating the need for a same ethnicity spouse and 2 education raises the likelihood of leaving ethnic enclaves thereby decreasing the probability of meeting potential same ethnicity spouses this paper considers a third option the role of assortative matching on education if education distributions differ by ethnicity then spouse searchers may trade similarities in ethnicity for similarities in education when choosing spouses u s census data on second generation immigrants provide strong support for the assortative matching mechanism

geographic poverty traps a micro model of consumption growth in rural china how important are neighbourhood endowments of physical and human capital in explaining diverging fortunes over time for otherwise identical households in a developing rural economy to answer this question we develop an estimable micro model of consumption growth allowing for constraints on factor mobility and externalities whereby geographic capital can influence the productivity of a household s own capital our statistical test has considerable power in detecting geographic effects given that we control for latent heterogeneity in measured consumption growth rates at the micro level we find robust evidence of geographic poverty traps in farm household panel data from post reform rural china our results strengthen the equity and efficiency case for public investment in lagging poor areas in this setting copyright 2002 john wiley sons ltd

regional agricultural endowments and shifts of poverty trap equilibria evidence from ethiopian panel data we examine changes in patterns of equilibria over time and across regions applied to the ethiopia rural household survey we revisit incidence of multiple equilibria using new nonparametric techniques and examine single equilibria that remain stagnant below the poverty line using quantile regressions we identify differences across the income distribution we introduce the empirical analysis of sequences of equilibria we identify a single equilibrium in 1994 1999 but find a second higher equilibrium emerging in 1999 2004 evidencing a shift from unimodal toward a bimodal asset distribution the most deprived region exhibits a low level stagnant equilibrium despite significant rural income growth nationwide

networks in the modern economy mexican migrants in the u s labor market this paper attempts to identify job networks among mexican migrants in the u s labor market the empirical analysis uses data on migration patterns and labor market outcomes based on a sample of individuals belonging to multiple origin communities in mexico over a long period of time each community s network is measured by the proportion of the sampled individuals who are located at the destination the united states in any year we verify that the same individual is more likely to be employed and to hold a higher paying nonagricultural job when his network is exogenously larger by including individual fixed effects in the employment and occupation regressions and by using rainfall in the origin community as an instrument for the size of the network at the destination

optimal social security in a dynastic model with human capital externalities fertility and endogenous growth abstract in this paper we investigate the optimal scale of pay as you go social security in a dynastic family model with human capital externalities fertility and endogenous growth human capital externalities reduce the return to human capital investment and hence lead to under investment in human capital and over reproduction of the population if the taste for the number of children is sufficiently weak relative to the taste for the welfare of children social security can be welfare enhancing by reducing fertility and raising human capital investment per child

how large are learning externalities the quantitative features of human capital externalities are not fully understood although static externalities are estimated in some studies learning externalities remain mostly unestimated by calibrating a growth model this article provides an estimate of learning externalities the calibration uses an equilibrium condition that equates private returns on physical capital and human capital the results suggest that sizable learning externalities exist even in a conservative setup the estimated social rate of return on human capital is 9 0 compared to the private rate of return 6 6 therefore human capital externalities are an important source of economic growth