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排序方式: 共有747条查询结果,搜索用时 15 毫秒
1.
我国林业投资体制的改革面临着许多新的课题,研究市场经济条件下林业投资状况十分必要。首先,从均衡理论出发,在分析宏观经济政策对林业的影响和林业投资现状基础上,对形成这种状况的主要原因进行了探讨;其次,以林业投资对象为主体,对其微观经济行为的成本与收益问题进行了分析;最后,提出深化林业投资体制改革要促进投资主体多元化,给予林业更多的政策扶持,进一步完善林业法律法规,以促进我国林业持续稳定地发展。 相似文献
2.
Summary Based on 14 case studies of highly effective therapies and the reasons they succeeded less frequently than they could, we
propose a variety of steps to improve the health care system of the U.S.A. Whatever proposal emerges from current national
debates until innovations are shown to be safe and effective, they should not be supported; when slightly better technologies
are much more expensive than other good ones we need to consider appropriate choices carefully; simplified billing and bookkeping
would reduce our costs; when a technology is rapidly introduced cautionnary measures may be needed; tracking immunization
and repairing their omissions requires a new system; educational programs such as seen effective in hypertension should be
applied in other areas such as vaccination; in organ transplantation the nation should consider “presumed consent”; our payment
system sometimes creates perverse incentives and therefore needs review; and the preferences of the public in allocation of
health resources need to be discovered once the public is informed about the issues.
Research supported by Andrew W. Mellon Foundation. 相似文献
3.
沈阳作为一个重工业城市 ,在其二次创业过程中人口老龄化问题日益突出 ,因此 ,掌握沈阳市老年人口的生活状况 ,构建适合沈阳市老年人口现状的养老保障模式 ,已经成为沈阳市社会养老保障体系改革的重要内容。 相似文献
4.
This study examines the relationship between occupational status and fertility timing during a period of rapid development in Puerto Rico. Our fundamental hypothesis is that women with higher status occupations face greater opportunity costs than those with less valued jobs and therefore will be more likely to postpone parenthood until later ages than women without such high costs. We test this hypothesis using event history techniques with data from the 1982 Puerto Rico Fertility and Family Planning Assessment, an island-wide survey of women between the ages of 15 and 49. The analysis examines the effects of occupational status on the timing of first births, and finds strong support for the basic hypothesis, especially regarding the post-ponement of teen births. After the teen years, the effects are less pronounced. Overall, it appears that employment opportunities have played an important role in childbearing decisions in Puerto Rico.An earlier version of this paper was presented at the annual meeting of the Population Association of America, Denver, Colorado, 30 April–2 May 1992. 相似文献
5.
6.
文章提出具有卖空总量限制、阈值约束和V型交易成本的多阶段均值—半绝对偏差(M-SAD)投资组合优化模型。该模型分别运用均值和半绝对偏衡量资产的收益率和风险。由于交易成本的存在,该模型不满足无后效性的动态优化问题。文章将该模型近似为一般动态规划问题,提出一种新的离散迭代方法,并证明该算法是线性收敛的。最后,文章通过实证研究比较分析卖空总量限制和风险偏好系数取不同值时对投资组合最优策略的影响,验证模型和算法的有效性。 相似文献
7.
基于草场流转市场转型背景,利用内蒙古自治区和甘肃省820个牧户调查数据,实证检验了社会资本、信息渠道对牧户草场转入行为的影响及二者间的作用关系,并进一步探讨了交易费用的中介效应和代际差异的调节效应。结果表明:(1)转型市场下,社会资本仍能促进牧户草场转入,但作用方式发生变化,表现为关键网络节点和牧户主动利用社会网络能力的作用凸显,社会资本总量和被动依赖社会网络信息资源流入的作用式微。(2)网络信息渠道促进了牧户草场转入,但尚未对社会资本形成替代,社会资本与网络信息渠道并行不悖。(3)社会互动通过降低草场流转的交易费用促进了牧户草场转入,而关键网络节点、网络信息渠道不存在相应机制。(4)社会资本、网络信息渠道对牧户草场转入行为的影响存在显著的代际差异,表现为新生代牧户转入草场更加依赖网络信息渠道,中生代、老生代牧户转入草场仅依赖社会资本。据此,建议在建立和完善网络和实体草场流转交易平台等方面完善草场流转市场。 相似文献
8.
Rubinstein (1982) considered the problem of dividing a given surplus between two players sequentially, and then proposed a model in which the two players alternately make and respond to each other's offers through time. He further characterized the perfect equilibrium outcomes, which depend on the players time preferences and order of moves. Using both equal and unequal bargaining cost conditions and an unlimited number of rounds, two experiments were designed to compare the perfect equilibrium model to alternative models based on norms of fairness. We report analyses of final agreements, first offers, and number of bargaining rounds, which provide limited support to the perfect equilibrium model, and then conclude by recommending a shift in focus from model testing to specification of the conditions favoring one model over another. 相似文献
9.
This article employs Agent-Based Computational Economics (ACE) to investigate whether, and under what conditions, trust is viable in markets. The emergence and breakdown of trust is modeled in a context of multiple buyers and suppliers. Agents develop trust in a partner as a function of observed loyalty. They select partners on the basis of their trust in the partner and potential profit, with adaptive weights. On the basis of realized profits, they adapt the weight they attach to trust relative to profitability, and their own trustworthiness, modeled as a threshold of defection. Trust and loyalty turn out to be viable under fairly general conditions. 相似文献
10.
Understanding of how women's experiences in retirement are shaped by their pre‐retirement lives is limited. In this paper we utilize an innovative mix of measures to examine the link between career histories and expectations and experiences of retirement. Analysis of timeline data capturing the long working lives of a sample of older women identifies five different pathways into retirement. We explore these trajectories in detail to determine how they are shaped and their links to different outcomes in later life. The analysis shows how different career histories unfold and how they shape expectations and experiences of retirement. Long, professional career pathways leave women feeling enabled in retirement, women following more fragmented pathways are more constrained, and some trajectories, including pathways involving transitions into professional careers in later life, can leave older women financially and emotionally vulnerable in older age. 相似文献