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ABSTRACT. This paper applies the production-theory approach to assess the impact on domestic wages and employment of immigration to the United States. Inputs are disaggregated between recent immigrants, non-recent immigrants, native workers, and capital. Census cross-sectional data for 1980 and for 123 metropolitan areas are used. Empirical estimates are reported for alternative functional forms with special attention devoted to required curvature conditions which have frequently been violated in previous work. Elasticity estimates are reported for alternative settings, including for the short run where we view domestic factor prices as given and the long run where we treat them as flexible.  相似文献   

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In 2010 the US declared the Lake Erie water snake a recovered species, but in Canada the snake is still considered to be an endangered species. After explaining the legal similarities between the Ontario Endangered Species Act and the American Endangered Species Act, this article examines a case study with landowner interviews from one US island and one Canadian island. It is concluded that landowner attitudes toward conservation and private property are very similar. Thus, it is argued that bureaucratic differences, particularly institutional capacity and implementation styles, enabled the US but not Canada to recover the snake. The article concludes with a discussion of the need for better communication between the two countries for the purposes of biodiversity conservation.  相似文献   

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This essay evaluates the explanatory power of two current models - ‘centrifugal’ and ‘centripetal’ - of the evolution of inner cities. This in done in the light of data on socioeconomic trends that affect residential areas in the cores of the nine major Canadian metropolitan regions. The centrifugal model focuses on the attraction of suburbs on central city residents; the centripetal concentrates on the lure of some inner-city neighbourhoods for certain middle- and upper-income households. While the Canadian trends support some propositions of the models, they seriously challenge others, us models seem unsuitable for explaining Canadian urban reality. They fail to account for the relative socioeconomic stability of core neighourboods in major Canadian cities and the dissociation between trends in their residents' incomes and in housing values. Cet article évalue le pouvoir d'explication démontré par les ébauches théoriques qui visent à faire comprendre l'évolution des quartiers situés à l'interieur des centres urbains. Cette évaluation se sert de données relatives aux tendances socio-économiques qui marquent les secteurs résidentiels situés au coeur des neuf plus grandes zones métropolitaines du Canada. Deux modèles dominent ce champ d'étude: il y a d'abord le modèle ‘centrifuge,’ qui postule une attraction des banlieues exercée sur les résidents de la ville centrale; puis le modèle ‘centripète,’ qui explique l'attrait qu'exercent ces quartiers sur certains manages a moyens et hauls revenus. Alors que les tendances observées dans les agglomérations canadiennes viennent donner du poids à certaines propositions de ces modèles, elles présentent également un défi de taille à certaines autres. Les difficultés ressenties dans l'application de ces deux modèles paraissent relever de l'inadaptation de modèles conçus aux Etats-Unis à la réalité urbaine canadienne. Ces modèles sont considérés particulièrement inaptes à expliquer la relative stabilité socio-économique des quartiers des grandes agglomérations canadiennes et à rendre compte d'un écart grandissant entre lesrevenus de leurs résidents et la valeur des unités de logement qui s'y trouvent.  相似文献   

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《Southeastern Archaeology》2013,32(2):242-267
Abstract

Freshwater mussel shell was used as a temper in the manufacture of ceramic vessels by potters in the Caddo area of the southeastern United States after ca. A.D. 1300. This was at least one or two centuries after it became the dominant temper used by aboriginal groups in much of the Eastern Woodlands but generally contemporaneous with shelltempered usage in parts of the Southern Plains. The introduction of shell temper was variable across the Caddo area, and in certain regions its use was negligible in ceramic vessel assemblages until the sixteenth and seventeenth centuries but then was rapidly adopted as the dominant temper employed in vessel manufacture, particularly for utility wares. In the traditional territory of the historic Hasinai Caddo in East Texas, shell temper did not appear in vessels until the early eighteenth century, and then only in minor amounts on presumed trade vessels.  相似文献   

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I presented 'The End of America: The Beginning of Canada' as a speculative piece of geographical interpretation. Judging by the length of the foregoing commentary and the number of written responses I have personally received, it is evident that my speculations have aroused considerable interest. I welcome the opportunity to clarify my argument. Rather than replying point by point to all the issues raised in the commentary, I will focus my remarks on what I take to be the central objection.  相似文献   

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