The impact of immigration on the internal migration of natives and immigrants

In this paper we examine the internal migratory response, by native-born non-Hispanic white men and foreign-born men in the United States, to recent immigration. Our analysis does not support the claim that natives have made a migratory response to recent immigration. Native-born men and foreign-born men were less likely to leave states that received large numbers of immigrants in the 1980s than they were to leave other states, and native-born men had less propensity toward out-migration than did foreign-born men. Out-migration was most likely to be deterred if recent immigrants originated in Europe or Asia. Although native-born non-Hispanic white men showed a tendency toward out-migration if recent immigrants originated in Latin America or the Caribbean, this result was insignificant after we controlled for state economic and regional context.     

Operations research in the management of the airlines

This paper is intended to present an introduction to the use of operations research in the international airline industry, and to demonstrate the scope and significance of the airline OR activities. First, the special reasons for the viability and spread of airline OR are discussed. Then a functional framework for an airline is outlined, to be used in analyzing the problems of an airline and relating the OR work to it. Four major applications are described, corresponding to four major components of the framework. These applications are: schedule development, overbooking control, crew scheduling and engine management, respectively. In each case we describe the problem and its significance, indicate the types of solution techniques which have been developed, and assess the implemented solutions. The paper concludes with comments on the current state-of-the-art and the future of airline OR. A detailed bibliography is given.Both of the authors have been operations research directors in major airlines and more recently have focused their attention upon the industry as academic researchers. This background has provided us with an unusual opportunity to analyze the role of OR in the airlines, and our paper seeks to share with the reader some of the insights we have gained thereby.     

Alcohol education provided to opioid treatment program patients: results of a nationwide survey

Alcohol-related problems are especially common among opioid treatment program (OTP) patients, suggesting that educating OTP patients about alcohol and its harmful effects needs to be a priority in OTPs. Using data collected in interviews with a nationwide U.S. sample of OTP directors (N = 200) in 25 states, we identified factors that differentiate OTPs that provided this education to all OTP patients from those that did not. Findings indicate that these factors include (1) providing this education in a greater variety of ways, (2) having a larger percent of staff knowledgeable about alcohol-related issues, (3) having a director who views alcohol issues as a high priority, and (4) having a written OTP policy.     

International migration policies: conceptual problems

Kritz reviews national concepts and policies of migration. She examines how nation-states approach migration and how they define who is a migrant. Policies for permanent, temporary, and illegal migrants are examined for selected countries. While the traditional permanent immigration countries--Australia, Canada, New Zealand, and the US--continue to admit large numbers of permanent migrants, they are also admitting growing numbers of temporary migrants. Other countries, in Europe and the developing world, have different migration histories and use other approaches to admit foreigners--migrants are generally admitted on a temporary basis for work or other purposes. Growing numbers of these temporary migrants, however, do become long-term or permanent settlers, and the distinction between permanent and temporary migration policies becomes a short-term legal one rather than a long-term sociological one. Governments have been seeking those policy instruments that would allow them to improve control over who enters and settles in their territories, and temporary migration policies are the measures to which they are turning. While increasing restriction characterizes the policy stance of most countries toward international migration, this does not necessarily mean that the number of migrants entering is declining. Kritz argues that the concepts employed by countries in their immigration policies frequently do not correspond to the reality, making it necessary to examine the actual context.     

股东参与治理的私人收益和社会收益的实证研究

本文探讨了股东参与治理所带来的私人收益、特定股权结构的社会收益以及股权集中成本三者之间的关系。我们分析的结果表明,当股东与经理人员之间的利益冲突水平较高、其它治理机制的作用较弱时,股权集中(股东参与治理的积极性较高)可以创造大量的社会收益;反之,股权的集中与分散程度(股东参与治理的积极性较低)对社会收益的影响不明显。本文的研究结论为我国股东参与治理及股权结构改革提供了重要启示。     

International Student Mobility and Tertiary Education Capacity in Africa

In Africa, 5.8 per cent of enrolled tertiary students go outside their homelands for tertiary study. No other world region has this high a share of outbound student mobility. In this study, I examined why African countries have larger student outflows than other regions and, in particular, I considered the importance of tertiary education capacity in the region for student mobility. I evaluated the determinants of student outflows from African countries for three different measures: the total number of tertiary students abroad, the percentage of the tertiary age cohort studying abroad and the percentage of total enrolled students abroad. In addition to showing that country rankings differ on these mobility measures, the findings indicate that their determinants also differ. The study premise was that student outflows should be lower from countries that have a greater supply of tertiary training capacity and that thesis received strong support in models that estimated the percentage of total enrolled students abroad. In models for that outcome, student outflows were also larger if countries had high tertiary demand and populations under 2 million. The findings for models that estimated total numbers abroad and share of the tertiary cohort abroad were similar after controlling for interactions between tertiary education supply and GDP per capita. In addition, population size and per capita GDP were stronger correlates of student mobility in those models, which suggests that it is more difficult for education supply and demand measures to account for student outflows when crude outflow measures are used. I concluded that strengthening tertiary education supply at home would be a cost‐effective way for African governments to increase their human capital and reduce brain drain losses.     

Determinants of Women's Decision-Making Authority in Nigeria: The Ethnic Dimension

Using data from a 1991 survey of five ethnic groups in Nigeria, we look at the determinants of wife's decision-making authority. Our analysis shows that ethnicity plays a very important role in shaping wife's decision-making authority and is even more important than wife's individual-level characteristics as a determinant of authority. The ethnic effect occurs both by shaping the levels of resources that women achieve and by shaping the relationships of wife's achieved characteristics to family decision-making. To the extent that characteristics other than ethnicity make a difference for authority, we find that wife's contributions to household expenditures are important. That factor significantly increases wife's authority, as does wife's formal education, age, and work for pay outside the home. The findings underscore the importance of looking at ethnic social differentiation in the African context and advancing educational and employment opportunities for women.