Immigration rates of species into communities are widely understood to influence community diversity, which in turn is widely expected to influence the susceptibility of ecosystems to species invasion. For a given community, however, immigration processes may impact diversity by means of two separable components: the number of species represented in seed inputs and the density of seed per speci...

Recent studies of individual attitudes toward immigration emphasize concerns about labor market competition as a potent source of anti-immigrant sentiment, in particular among less-educated or lessskilled citizens who fear being forced to compete for jobs with low-skilled immigrants willing to work for much lower wages. We examine new data on attitudes toward immigration available from the 2003...

There are large differences in immigration (per capita) levels among rich OECD countries. In addition these differences are unrelated to the respective levels of income per capita and display a large persistence over time. Existing economic theories of immigration cannot explain these facts. This paper presents a dynamic political-economy model of immigration where agents choose an immigration ...

National data indicate that U.S. whites have a higher prevalence of smoking compared to non-whites. Group position theory and public opinion data suggest racial differences in immigration concern. This study examines whether immigration concern mediates the racial difference in smoking. Drawing on the 2012 General Social Survey, the 2012 American National Election Study, and the 2006 Portraits ...

ABSORBING LOCAL SHOCKS IN LABOR SUPPLY Immigration to the U.S. in recent decades has been substantial and geographically concentrated. Nevertheless, research consistently finds little evidence that it has a major impact on the wages and employment rates of the native population in areas where immigrants settle. Though some recent evidence suggests that immigration may depress wages nationally, ...

Introduction: Although education is among the major socioeconomic status (SES) resources that influence populations’ and individuals’ health, social marginalization may reduce the health gain that follows access to SES indicators such as education, a pattern called marginalization-related diminished return (MDR). The literature on MDRs, however, has been mainly derived from stu...

Abstract This paper uses queuing theory to examine the linkages between legal and illegal immigration. approach is particularly appropriate for periods of mass migration can be used look at how magnitude people trying migrate affects choice channels. An empirical illustration shows origin-country conflict past differently affect current flows. With data Schengen countries from Eurostat document...

Canada has a long history of welcoming immigrants and a longstanding immigration policy framework. The historic principles that govern immigration selection and processing also include regulatory policies in the area of health. Based on historical principles that pre-date Confederation, Canadian immigration health policy has remained relatively constant. Policies are based on the identification...

this study is a descriptive - survey and objective evaluation analysis of creation causes on informal settlement shadgholi-khan town of qom city. answer questionnaire by 200 protector of household in shadgholi-khan tow, economic, social and physical variables affective creation of informal settlements in the shadgholi-khan its spatial and local effects are investigated. research findings show t...