La mayor parte de la literatura sobre migracin calificada se ha centrado en la fuga de cerebros. En este trabajo lo que buscamos es verificar si aument el stock de la migracin calificada en Estados Unidos entre 1990 y 2000. Adems, buscamos conocer sus caractersticas tales como las del capital humano, las demogrficas y los de contextos que son determinantes de su insercin laboral. Es as, como en esta ponencia hemos encontrado que un porcentaje importante de los trabajadores calificados mexicanos son altamente discriminados hacia ocupaciones no calificados, con bajos ingresos y se insertan de manera particular en sectores que demandan trabajadores manuales.

Employment rates in Puerto Rico range from 55 to 65 percent of U.S. rates during the past thirty years. This huge employment shortfall holds for men and women, cuts across all education groups, and is deeper for persons without a college degree. The shortfall is concentrated in the private sector, especially labor-intensive industries that rely heavily on less educated workers. Motivated by these facts, we identify several factors that undermine employment growth and business development, including high minimum wage requirements, a history of tax incentives for capital-intensive activities, a host of regulatory entry barriers, and a business climate in which profitability and survival too often rest on the ability to secure favors from the government. We pay close attention to the permitting process whereby the government oversees and regulates construction and real estate development projects, the commercial use of equipment and facilities, and the periodic renewal of various business licenses. Based on interviews with experts and participants in the permitting process, and supplemented by other sources, we compile evidence that the permitting process is excessively slow and costly, fraught with uncertainty, subject to capricious outcomes, susceptible to corruption, and prone to manipulation by business rivals and special interest groups.

Under the urging of late nineteenth-century reformers, U.S. policy toward American Indians shifted from removal and relocation efforts to state-sponsored attempts to civilize Indians through allotment of tribal lands, citizenship, and forced education. There is little consensus, however, whether and to what extent federal assimilation efforts played a role in the stabilization and recovery of the American Indian population in the twentieth century. In this paper, we rely on a new IPUMS sample of the 1900 census of American Indians and census-based estimation methods to investigate the impact of federal assimilation policies on childhood mortality. We use children ever born and children surviving data included in the censuses to estimate childhood mortality responses to several questions unique to the Indian enumerationincluding tribal affiliation, degree of white blood, type of dwelling, ability to speak English, and whether a citizen by allotmentto construct multivariate models of child mortality. The results suggest that mortality among American Indians in the late nineteenth century was very highapproximately 62 percent higher than that for the white population. The impact of assimilation policies was mixed. Increased ability to speak English was associated with lower child mortality, while allotment of land in severalty was associated with higher mortality. The combined effect was a very modest four percent decline in mortality. As of 1900, the government campaign to assimilate Indians had yet to result in a significant decline in Indian mortality while incurring substantial economic and cultural costs.

The strong correlation between parents' economic status and that of their children has been well-documented, but little is known about the extent to which this is a causal phenomenon. This paper attempts to improve our understanding of the causal processes that contribute to intergenerational immobility by exploiting historical changes in compulsory schooling laws that affected the educational attainment of parents without affecting their innate abilities or endowments. We examine the influence of parental compulsory schooling on grade retention status for children aged 7 to 15 using the 1960, 1970 and 1980 U.S. Censuses. Our estimates indicate that a one-year increase in the education of either parent reduces the probability that a child repeats a grade by between five and seven percentage points. Among 15 to 16 year olds living at home, we also estimate that parental compulsory schooling significantly lowers the likelihood of dropping out. These findings suggest that education policies may be able to reduce part of the intergenerational transmission of inequality.

...This paper improves on previous attempts to infer cohabitation from the decennial census. The 1990 and 2000 censuses included specific responses for unmarried partner in the relationship question; previous censuses classified these individuals in broader partner/roommate or partner/friend categories. Our goal is to infer as best we can which individuals in the censuses of 1960 though 1980 would have described themselves as opposite sex unmarried partners if that option had been available on the census. We do this by first developing rules to identify households that are likely contain an unmarried partner, and then by applying a regression model to refine these measures...

There was a time when people were committed to working hard and being productive in the work force. Today, however, some workers have an entitlement mentality and the labor pool includes some people who don???t want a job - just a paycheck. In response to this trend, Glenn Shepard has written How to Manage Problem Employees. This comprehensive book will tell you how to set new hires up for success, structure compensation packages to maximize their involvement and work ethic, deal with problem areas before they become bad behavior, and motivate slow and often unmotivated employees. You'll learn the different personality types and how to handle specific manifestations of each, including gossiping, back stabbing, direct confrontation, hypochondriacs, breaking the chain of command, and sarcasm, as well as how to terminate employees while staying on solid legal ground

Using a sample from the comparatively most privileged group of black males, those married and living with a working spouse, this article investigates how race-based residential locations and the spatial structure of labor markets affect commuting experiences. This research uses the most sophisticated commuting data available at the time the research was conducted, the 1990 5 percent Public-Use Microdata Samples for the Atlanta Metropolitan Area, and again confirms severe spatial mismatch problems for central-city blacks, regardless of socioeconomic status, household formation, and access to automobiles. However, the situation with black males living in suburban areas differs significantly as those in the southern (predominantly black) suburbs show considerable evidence of spatial mismatch, whereas the northern ( predominantly white) suburbs show no such evidence.

The idea of creating a balance between jobs and housing within different commuting catchment areas of a city has been a prominent approach for reducing traffic congestion, air pollution, and commuting times. Dual-earner households, in which both members of a married couple are employed, have been identified as an obstacle to the job-housing balance concept due to their limited ability to choose a residential location near both workplaces. However, this has not yet been conclusively tested. Drawing on the 2000 5% PUMS dataset for metropolitan Atlanta, this paper examines the commuting behavior of these households relative to single-earner households. The results challenge the dominant assumption that the average commutes of married couple dual-earner households are necessarily longer than that of single-earner households. In fact, after controlling for all forms of socioeconomic factors in the analysis, this paper shows there are either no significant differences, or if there are, the average commutes of single-earner households are longer. It is a lack of affordable housing near job locations, or vice versa, and not the presence of dual-earner households, that should be blamed for lengthening commuting time and any difficultly in implementing job-housing balances.

Because of its theoretical and practical importance, the field of frequent pattern mining has been and remain to be one of the most active research area in KDD. In this dissertation, we study three different problems in frequent pattern mining, mining multiple datasets, mining streaming data, and mining large-scale structures from graph datasets. Our study has not only extended the breadth of frequent pattern mining, but also brought new techniques and algorithms into this field. Specifically, our contributions are as follows. 1. Mining Multiple Datasets: We develop a systematic approach to generate efficient query plans for a single mining query across multiple datasets. We also propose methods to simultaneously optimize multiple such queries and utilize the past mining results in a query-intensive KDD environment. Our experimental results have shown a speedup up to two-order of magnitude comparing with the naive methods without these optimizations. 2. Mining Frequent Itemsets over Streaming Data: We propose a new algorithm Stream-Mining to discover the frequent itemsets over streaming data. In a single pass, StreamMining will guarantee to find a superset of frequent itemsets, but false positive may occur. If the second pass is allowed, StreamMining will be able to remove the false positive and find the exact frequent itemsets. Our detailed evaluation using both synthetic and real datasets has shown our one-pass algorithm is very accurate in practice, and is also very memory efficient.3. Mining Frequent Large-Scale Structures from Graph Datasets: We develop a new framework to discover the frequent large-scale structures from graph datasets. This framework is derived from a mathematical concept, topological minor. In this framework, we propose a new algorithm TSMiner, which efficiently enumerates all the frequent large-scale structures in a graph dataset, and a new approach called relabeling function to perform constraint mining. We apply our framework to protein structure data and discover meaningful topological structures. Finally, we demonstrate the viability and scalability of the proposed algorithms on both real and synthetic datasets.

Fertility rates have fallen below replacement levels in many economies. We examine the relationship between female incomes and fertility for college graduates in the United States. Female income is likely endogenous to fertility, and candidate instrumental variables are likely imperfect. We use the Nevo and Rosen (2012) imperfect instrumental variable procedure to estimate two-sided bounds for the effect of female income on fertility. The effect of female income on fertility is unambiguously negative and non-trivial, but the magnitude is relatively small. Our results suggest that the recent fertility slowdown in the U.S. is not primarily due to higher female incomes.

Whether water systems should be owned and operated by governments or private firms is intensely controversial, and little empirical research sheds light on the issue. In this paper we use a panel dataset that includes every community water system in the U.S. from 1997-2003 to test the effects of ownership and benchmark competition on regulatory compliance and household water expenditures. We find that when controlling for water source, location fixed effects, county income, urbanization, and year, there is little difference between public and private systems. Public systems are somewhat more likely to violate the maximum levels of health-based contaminants allowed under the Safe Drinking Water Act (SDWA), while private systems are somewhat more likely to violate monitoring and reporting regulations. The results are reversed for systems that serve more than 100,000 people. Household expenditures on water at the county level decrease slightly as the share of private ownership increases, contradicting fears that private ownership brings higher prices. While direct competition among piped water systems is practically nonexistent, we find that benchmark competition among water systems within counties is associated with fewer SDWA violations and, when combined with private ownership, lower household expenditures. Overall, the results suggest that absent competition, whether water systems are owned by private firms or governments may, on average, simply not matter much.

Living wage campaigns are frequently presented as a quest for economic justice. Often missed, however, is that the living wage is very much a political issue at the local level, and that the typical living wage campaign needs to be understood within the context of urban theory. This book explores what factors led to the adoption of living wage laws in four cities: Los Angeles, Detroit, Baltimore, and New Orleans. The changing economic base of each city is illustrated on the basis of IPUMS data from 1950-1990. In response to each city's changing economic base, each city's governing regime felt compelled to pursue a set of policies aimed at revitalizing their economies. To the extent that these regimes felt compelled to pursue policies such as the outsourcing of municipal services in order to create favorable business climates intended to attract investment, living wage movements can be viewed as the inevitable political backlash. Living wage movements, then, were the results of policy failure; they were a by-product of the failure to adequately address the changes that were occurring, mainly the changing urban economic base and growing income inequality.

The existence of family formation differences between African Americans and non-African Americans is not a new phenomenon. However, in the years since Emancipation there have been substantial evolutions in those differences. This study uses data from the U.S. Census and the National Survey of Families and Households to examine the role of historically-persisting factors as causes of evolving racial differences in marital disruption. Consistent with previous research I find that the magnitude of the racial marital disruption gap grew until the middle of the 20th century. However, new methodology that I employ to examine Census data shows that growth in Black/non-Black differences in the frequency of marital disruption stopped around mid-century and, in fact, narrowed by about one-third between 1950 and 1980. In neither the pre- nor post-1950 periods can changes in observed measures account for more than a small fraction of the overall change in the disruption gap. In this study I demonstrate how racial differences in outcomes may change even in the absence of corresponding changes in racial differences in causal factors. Persisting inter-group differences in characteristics that influence family formation have varying impacts depending on the broader social context. Focusing on the historical contingency of causal effects, I develop and test theories of how persisting differences in both observed and unobserved group factors contributed to changes in the Black/non-Black marital disruption gap over the course of the 20th Century.