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胡锦山 《史学月刊》2004,(1):105-112
对于美国黑人聚居区环境的产生和发展,居住隔离起到了直接的作用。居住隔离使美国大多数黑人处于从属地位,处于主流社会的边缘,并使黑人贫困持久化,进而加速了黑人经济地位的下降,使许多美国黑人陷入贫困的隔离居住环境不能自拔。  相似文献   

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Three urban determinants of rent from agricultural land around metropolitan areas are incorporated into one rent model. The urban market factor and the transport cost as expressed in the Thünian crop rent equation are discussed in terms of their relevance to metropolitan areas. Then the effects on rent of the urban land market and urban economic change and their relationships with the market factor are examined. Graphic and mathematical expressions of a multideterminant model based on the combined crop system are developed, followed by a discussion on several variations of the model.  相似文献   

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In this paper we use time-series techniques to examine whether monetary policy had symmetric effects across U.S. states during the 1958:1–1992:4 period. Impulse response functions from estimated structural vector autoregression models reveal differences in policy responses, which in some cases are substantial. We provide evidence on the reasons for the measured cross-state differential policy responses. The size of a state's response is significantly related to industry-mix variables, providing evidence of an interest rate channel for monetary policy, although the state-level data offer no support for recently advanced credit-channel theories.  相似文献   

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Abstract.  A dynamic labor market model is used to motivate the inclusion of population characteristics and industrial structure as determinants of regional employment instability. We examine how these factors influence regional employment instability using data from both metropolitan and nonmetropolitan regions in the United States. We find that population characteristics are important determinants of employment volatility and that increased industrial specialization (reduced diversification) increases employment volatility, but the magnitude of that influence drops substantially once population characteristics are considered. We also find that the influence of population characteristics and industrial specialization varies significantly across metropolitan and nonmetropolitan regions.  相似文献   

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The Causes of Regional Variations in U.S. Poverty: A Cross-County Analysis   总被引:1,自引:0,他引:1  
The persistence of poverty in the modern American economy, with rates of poverty in some areas approaching those of less advanced economies, remains a central concern among policy makers. Therefore, in this study we use U.S. county-level data to explore potential explanations for the observed regional variation in the rates of poverty. The use of counties allows examination of both nonmetropolitan area and metropolitan area poverty. Factors considered include those that relate to both area economic performance and area demographic composition. Specific county economic factors examined include economic growth, industry restructuring, and labor market skills mismatches.  相似文献   

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This paper explores, theoretically and empirically, the influence of interregional migration on regional fertility differentials. Specifically, it tests the hypothesis that regions that are closely linked through migration have, all else held constant, a lower differential in fertility than regions that are relatively isolated from one another. A model linking the fertility differential between two states to migration as well as a number of socioeconomic variables is articulated. The model is tested by means of a randomization procedure using U.S. state-level data for 1980. Results support the hypothesis that an increasing volume of interregional migration tends to lower regional fertility differentials.  相似文献   

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Law enforcement by the U.S. Coast Guard (USCG) is characterized by soft penalties for safety violations, low incidence of penalties relative to the number of violations, and substantial resources devoted to inspections of vessels. Under what conditions can such an enforcement strategy be effective? And is it? This article seeks answers to these two questions. Harrington's (1988 ) model is motivated by such facts about U.S. regulation in general, and provides an answer to the first question via targeting of good and poor performers. The model generates hypotheses about optimal regulation in the context of pollution prevention activities of the USCG. In order to answer the second question, an organization‐level panel data set consisting of thousands of U.S. flag tank barges is constructed and those hypotheses tested. A count model that controls for vessel heterogeneity yields mixed evidence. If USCG inspections are considered exogenous variables (as the theory presumes), they appear to prevent pollution spills. But if inspections are endogenous and respond to previous spills, then correcting for endogeneity reverses the earlier result. In addition, violations are found to be good predictors of pollution occurrences, suggesting that inspections are not as effective as they could be. Targeting, as in Harrington's model, therefore appears to be incomplete, and the findings suggest that more complete targeting could increase performance. An interesting finding is that stronger penalties could increase performance.  相似文献   

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Evaluation of the success of a plan requires the collection of statistics and indicators for monitoring purposes. In the health care field, outcomes are notoriously difficult to measure. To the extent that a successful program of prevention should result in providing less of a service, a conflict exists between planning and prevention: in the absence of outcome measures, success will be indistinguishable from failure, as in both cases, planned targets would not be met. To avoid this dilemma, an indicator-oriented planning system would be predicted to operationalize prevention in countable terms requiring increased inputs, or increased numbers of processes, regardless of the payoffs in health benefits. Screening, check-ups, and one-on-one contacts with health professionals would be emphasized at the expense of group-oriented activities or societal changes. Planning can thus have counter-productive policy implications. This theory is illustrated by reference to the current health care system in the U.S.S.R., including their anti-smoking and anti-alcoholism programmes.  相似文献   

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