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排序方式: 共有79条查询结果,搜索用时 15 毫秒
31.
Per G. Fredriksson Satyendra Kumar Gupta Weihua Zhao Jim R. Wollscheid 《Journal of regional science》2023,63(1):236-252
This paper studies the effect of legal origins (common law vs. civil law) on contemporary slum formation in developing countries. First, we provide a cross-country correlation analysis. Second, we provide a regression discontinuity analysis using household data from Cameroon. The results suggest that a common law heritage is associated with a lower probability of slum conditions. The legal philosophies transplanted through colonization appear to be associated with the pattern of contemporary urban housing stocks in developing countries. 相似文献
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How has the history of the twentieth century affected the extent of female disadvantage in child survival in China, South Korea and India, and how has this in turn shaped spousal availability and marriage payments? These three countries have similar kinship systems which generate discrimination against girls, and they show the highest levels of excess female child mortality in the world. This article explores how the extent of excess female child mortality was influenced by historical events in these countries in the period 1920–90, and discusses some of the substantial social ramifications of resulting changes in sex ratios. The authors hypothesize that these changes encouraged the retention of brideprice in China while dowry became the norm in India, and illustrate how these demographic changes have influenced the extent and manifestations of violence against women. 相似文献
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There is a great contrast in geochemical and hydrogeologic estimates of the residence times of pore fluids in sedimentary basins. This contrast is particularly evident in the Alberta Basin, Canada, which has served as the study area for important studies of long‐term fluid flow and transport. To address these differences, we developed two‐dimensional simulations of groundwater age, constrained by both hydrogeologic and geochemical observations, to estimate the residence time of fluids and the amount and timing of flushing by meteoric waters in the Alberta Basin. Results suggest that old, residual brines have been retained in the deepest parts of the basin since their formation ca. 400 Ma, but significant dilution by younger waters has reduced the age of these pore waters to no more than approximately 200 My. Shallower formations have been flushed extensively by fresh, young waters. Loss of brines and dilution of older pore waters occurred primarily after the uplift of the Rockies with the introduction of the gravity‐driven flow regime. Despite these large changes in flow regime, solute exchange between deep saline aquifers and the overlying vigorous freshwater flow system was found to be consistent with long‐term dispersive mixing across subhorizontal concentration gradients rather than by direct flushing. Sensitivity studies using an analytic solution supported the use of 100 m for transverse dispersivity in large‐scale numerical models. These simulations confirm that the age and origin of brines are in many cases poor indicators of long‐term solute transport rates in sedimentary basins, but the geochemical indicators that are used to determine the origin of brines can provide useful constraints for calculating groundwater age and are far more commonly available than isotopic groundwater age tracers. 相似文献
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Consider a two-stage non-cooperative Cournot game with location choice involving n≥ 2 firms each with several facilities. There are m≥ 2 spatially separated markets constituting the vertices of a network. Each firm first selects the locations of their facilities and then selects the quantities to supply to the markets to maximize its profit. There exists a Nash equilibrium in the quantities offered by each firm at the markets. Furthermore, when the demand in each market is sufficiently large, each firm chooses to locate its facilities only at vertices. With linear demand in each market, there exists a Nash location equilibrium. 相似文献
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Abstract. The paper analyzes spatial competition among firms that sell substitute and/or complementary products. The firms first choose locations on the perimeter of a circular city and then compete in quantities (à la Cournot). Both linear and convex (quadratic) transport costs are considered. In general, multiple location equilibria are encountered. Complete agglomeration, partial agglomeration, and complete dispersion are possible. Convex (quadratic) transport cost substantially shrinks the set of equilibria obtained under linear transport cost. In general, the results obtained for a larger number of firms selling complementary products are strikingly different from those obtained under a duopoly. 相似文献
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Michael Lokshin Monica Das Gupta Michele Gragnolati Oleksiy Ivaschenko 《Development and change》2005,36(4):613-640
Levels of child malnutrition in India have fallen only slowly during the 1990s, despite significant economic growth and considerable expenditure on the Integrated Child Development Services (ICDS) programme, of which the major component is supplementary feeding for malnourished children. To begin to unravel this puzzle, this article assesses the programme's placement and its outcomes, using NFHS data from 1992 and 1998. The authors find that programme placement is clearly regressive across states. The states with the greatest need for the programme — the poor Northern states which account for nearly half of India's population and which suffer from high levels of child malnutrition — have the lowest programme coverage and the lowest budgetary allocations from the central government. Programme placement within states is more progressive: poorer and larger villages have a higher probability of having an ICDS centre, as do those with other development programmes or community associations. In terms of outcomes, the authors find little evidence of programme impact on child nutrition status in villages with ICDS centres. 相似文献
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