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排序方式: 共有618条查询结果,搜索用时 156 毫秒
611.
The United States Supreme Court recently ruled that the U.S. Food and Drug Administration does not have the legal authority to regulate tobacco products. This ruling significantly affects public health efforts to reduce tobacco addiction, especially among the nation's youth. This decision has broader health implications as well, since tobacco-related diseases are among many of the top ten leading causes of death. Paradoxically, this decision comes at a time where states are developing new health programs to address tobacco-related illnesses using funds from the landmark tobacco lawsuit.  相似文献   
612.
Using data from the Fragile Families and Child Wellbeing Study (N = 781), I examined how father visitation for children born outside of marriage is affected by subsequent maternal relationship formation, focusing on the timing, type, and stability of maternal relationships. Results showed that fathers were most likely to have not seen their child at all when mothers formed a new relationship early in the child's life, especially if the new relationship was coresidential and the partner engaged in activities with the child. Fathers who initially visited their child were more likely to stop visiting their child if an initially unpartnered mother became partnered. Frequency of visitation was not as strongly affected as whether visitation occurred at all.  相似文献   
613.
This study shows that the position of cities in the world economy has diverged from national economies. Using data from 2016, we evaluate a network of 12,802 cities formed by the location decisions of 24,355 firms in terms of their point centrality, and show that the inter-city and inter-national systems have measurably decoupled, disrupting the previously-observed pattern in which the most powerful cities in the world city system were located in core countries, "mid-level" cities were in the semi-periphery,and the least powerful cities were in peripheral countries. Our findings support predictions that globalizing cities would diverge from national economies and that globalization would generate a new global geography that transects long-standing cleavages in the world system.  相似文献   
614.
We analyse the impact of different immigration policies on human capital investment in a search‐theoretic model. This class of models features unemployment and underinvestment in human capital. The underinvestment in human capital can be solved by combining immigration policy with appropriate education subsidies. Extending the model with respect to different skill groups allows to analyse the observed bimodal skilled immigration of the USA.  相似文献   
615.
Benjamin Artz 《LABOUR》2008,22(2):315-343
Abstract. Job satisfaction reflects the on‐the‐job utility of workers and has been found to influence both the behavior of workers and the productivity of firms. Performance pay remains popular and widely used to increase worker productivity and more generally align the objectives of workers and firms. Yet, its impact on job satisfaction is ambiguous. Whereas the increased earnings increase job satisfaction, the increased effort and risk decreases job satisfaction. This paper finds empirical evidence that on net performance pay increases job satisfaction but does so largely among union workers and males in larger firms.  相似文献   
616.
In the post-Recession era, U.S. fertility rates have continued to fall. It is unclear if these declines are driven by shifts in fertility goals or growing difficulty in achieving goals. In this paper, we construct synthetic cohorts of men and women to examine both cross-cohort and within-cohort changes in fertility goals using multiple cycles of the National Survey of Family Growth. Although more recent cohorts exhibit lower achieved fertility at younger ages than earlier cohorts at the same age, intended parity remains around two children, and intentions to remain childless rarely exceed 15 percent. There is weak evidence of a growing fertility gap in the early 30s, suggesting more recent cohorts will need considerable childbearing in the 30s and early 40s to “catch up” to earlier goals, yet low-parity women in their early 40s are decreasingly likely to have unfulfilled fertility desires or intentions to have children. Low-parity men in their early 40s, though, are increasingly likely to intend children. Declines in U.S. fertility thus seem to be largely driven not by changes in early-life fertility goals so much as either a decreasing likelihood of achieving earlier goals or, perhaps, shifts in the preferred timing of fertility that depress period measures.  相似文献   
617.
Greater interdependence among workers and activities not only increases the need for internal communication, but it also imposes complications and barriers to effective information exchange. Intraorganizational communication capabilities of certain information systems can help overcome these barriers. However, the extent to which certain systems are promoted as communication tools depends largely on management's interpretation of their usefulness, which in turn may be largely dependent on operational context and managerial experience. We use a controlled experimental approach to study how these issues interact to impact managerial assessments of resource planning systems. Results show that managers value the communication capabilities of resource planning systems more so in highly task‐interdependent contexts and that these assessments are still more positive among managers with greater supervisory experience. As a result, these findings pose direct implications regarding the management support of technology use.  相似文献   
618.
The past forty years have seen a rapid rise in top income inequality in the United States. While there is a large number of existing theories of the Pareto tail of the long‐run income distributions, almost none of these address the fast rise in top inequality observed in the data. We show that standard theories, which build on a random growth mechanism, generate transition dynamics that are too slow relative to those observed in the data. We then suggest two parsimonious deviations from the canonical model that can explain such changes: “scale dependence” that may arise from changes in skill prices, and “type dependence,” that is, the presence of some “high‐growth types.” These deviations are consistent with theories in which the increase in top income inequality is driven by the rise of “superstar” entrepreneurs or managers.  相似文献   
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