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341.
342.
Abstract . We examine the dynamics of ideas production and knowledge-productivity relationship in a panel of 19 OECD countries. A new data set of triadic patents is used. We rigorously address the issues of cross-country heterogeneity and endogeneity. Domestic and foreign ideas stocks exert positive but heterogeneous effects on ideas production. We find evidence of duplicate R&D but little support for endogenous growth. Countries with low domestic ideas bases could considerably improve productivity through ideas accumulation; however, this effect is modest for countries with sizeable ideas bases. An implication is that country-specific R&D policy appears potentially more effective than the one-size-fits-all approach. 相似文献
343.
Food and beverage television advertising exposure and youth consumption,body mass index and adiposity outcomes 下载免费PDF全文
Lisa M. Powell Roy Wada Tamkeen Khan Sherry L. Emery 《The Canadian journal of economics》2017,50(2):345-364
This study examines the relationships between exposure to food and beverage product television advertisements and consumption and obesity outcomes among youth. Individual‐level data on fast food and soft drink consumption and body mass index (BMI) for young adolescents from the Early Childhood Longitudinal Study, kindergarten cohort, (1998–1999) and adiposity measures for children from the US National Health and Nutrition Examination Survey (2003–2004) were combined with designated market area (DMA) Nielsen media advertising ratings data. To account for unobserved individual‐level and DMA‐level heterogeneity, various fixed‐ and random‐effects models were estimated. The results showed that exposure to soft drink and sugar‐sweetened beverage (SSB) advertisements is economically and statistically significantly associated with higher frequency of soft drink consumption among youth even after controlling for unobserved heterogeneity, with elasticity estimates ranging from 0.4 to 0.5. The association between fast food advertising exposure and fast food consumption disappeared once we controlled for unobservables. Exposure to cereal advertising was significantly associated with young adolescents' BMI percentile ranking, but exposures to fast food and soft drink advertisements were not. The results on adiposity outcomes revealed that children's exposure to cereal advertising was associated with both percent body fatness and percent trunk fatness; fast food advertising was significantly associated with percent trunk fatness and marginally significantly associated with percent body fatness; and exposure to SSB advertising was marginally significantly associated with percent body and trunk fatness. The study results suggest that continued monitoring of advertising is important and policy debates regarding the regulation of youth‐directed marketing are warranted. 相似文献
344.
Ismail Issah Tariq Y. Khan & Komei Sasaki 《Review of urban and regional development studies : RURDS : journal of the Applied Regional Conference》2005,17(1):68-88
Developing an extended model of the basic Harris–Todaro model of rural–urban migration, we analyze the effects of infrastructure availability together with time-tested income effects while accommodating government behavior through the provision and financing of infrastructure. Our theoretical analysis confirms that infrastructure presence can be a significant factor in making migration decisions. Comparison with the basic Harris–Todaro model also reveals that while the Todaro paradox is absent in the basic model, it can be present in the extended model. 相似文献
345.
M.Ali Khan 《Journal of Mathematical Economics》1984,13(2):165-169
We show the existence of competitive equilibria in economies without ordered preferences and a Hausdorff locally convex solid Riesz space of commodities. Our principal assumptions are that the commodity space has a predual and that its positive cone has a non-empty interior. 相似文献
346.
This paper examines the relative contribution of public and private investment to per capita GDP growth in developing countries. It extends the basic neoclassical model of growth by separating investment into its public and private components, and estimates this model for a sample of 95 developing countries over the period 1970–90 using both cross-sectional and panel data. Using data on relative supplies of public and private capital stock, rates of return to public and private investment are also computed. The results suggest that once other determinants of growth, such as human capital formation, population growth, and technical progress, are taken into account, public and private investment have different effects on growth, and that these effects are characterized by marked regional and inter-temporal variations. 相似文献
347.
In protecting farm land near cities, policy makers must balance the interests of farmers against affordable housing demands of the urban population. This article examines land use competition between agriculture and housing on the Hawaiian island of Oahu. Land suitability ratings for farming and urban development are compared, and future urban expansion onto agricultural land is simulated under different land use policies. Results indicate severe tradeoffs for affordable housing if all high quality farm lands are strictly preserved. Achieving farmland protection goals will require further policy support to transform the local farm structure from plantation to diversified agriculture. 相似文献
348.
349.
Kabir-ur-Rahman Khan 《Food Policy》1978,3(2):104-113
The 1977 International Sugar Agreement is one of several contemporary agreements designed to regulate the international market in specific commodities. A commodity agreement at the same time serves as an instrument through which nations international policies are carried out, and defines the rights and duties characterizing the relations between importing and exporting countries. The author examines the 1977 International Sugar Agreement in this context, discussing its regulatory mechanisms, its relation with the ‘New International Economic Order’ and the extent to which the interests of both importers and exporters are protected. 相似文献
350.
The monetary dynamics of hyperinflation : A note 总被引:1,自引:0,他引:1
Mohsin S. Khan 《Journal of Monetary Economics》1975,1(3):355-362