نتایج جستجو برای: II . Immigration operator
تعداد نتایج: 681384 فیلتر نتایج به سال:
Hubs are centers for collection, rearrangement, and redistribution of commodities in transportation networks. In this paper, non-linear multi-objective formulations for single and multiple allocation hub maximal covering problems as well as the linearized versions are proposed. The formulations substantially mitigate complexity of the existing models due to the fewer number of constraints and v...
NE OF THE difficult questions that arises in the ongoing public debate on immigration is whether immigrants to the United States represent an overall cost or benefit to the U.S. economy. The answer to this question centers in part on the extent to which immigrants contribute to the labor force, compete for jobs with native workers and provide goods and services that otherwise would not be produ...
British population history has been shaped by a series of immigrations, including the early Anglo-Saxon migrations after 400 CE. It remains an open question how these events affected the genetic composition of the current British population. Here, we present whole-genome sequences from 10 individuals excavated close to Cambridge in the East of England, ranging from the late Iron Age to the midd...
after world war ii, the people and european governments got disappointed from radical right groups, and their activities were banned. however, during the past decade, we witness the strengthening the social base of the mentioned political parties which are seeking power in different european countries. the reason why these groups have come to power is due to a variety of factors causing importa...
Sectoral labor supply shortage is a cause of concern in many OECD countries and has raised support for immigration as a potential remedy. In this paper, we derive a general equilibrium model with overlapping generations, where natives require a compensating wage differential for working in one sector rather than in another. We identify price and wage effects of immigration on three different gr...
This study investigates the effects of the macroeconomic context on attitudes to immigration. Earlier studies do in some cases not provide significant empirical support for the existence of important such effects. In this article it is argued that this lack of consistent evidence is mainly due to the cross-national setup of these studies being vulnerable to estimation bias caused by country-spe...
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