对林业税费的经济学分析

该文运用经济学的基本工具———供给和需求曲线 ,以商品林为研究对象 ,探讨了林业税费的作用机理和内涵。该文认为商品林生产具有正的外部性 ,市场失灵使生产者将不能提供社会真正所需要的商品林数量。在封闭的市场条件下 ,林业税费会直接成为价格的一部分 ,商品林生产者应当能够获得正常利润 ,与税费高低无关 ,但会使一部分林地退出生产。林业补贴是一种负的林业税收。在开放市场经济条件下 ,国内商品林供应量低于没有林业税收时的商品林供应量 ,更低于考虑社会生态需求时的商品林供应量 ,造成巨大的社会福利损失 ,应减免林业税费、增加林业扶持、取消价格管制。该文进一步研究了与林业税费密切相关的森林采伐限额政策 ,认为对商品林应该完全取消采伐限额政策     

论工程量清单计价模式

分析了传统定额计价模式与市场经济不相适应之处,其主要表现为它不能反映企业的技术、管理水平等企业整体实力。在此基础上讨论了我国实行工程量清单计价模式的优点,这种计价模式要求企业自主报价、由市场交易形成建筑产品的价格,是一种新的市场定价计价模式,能适应市场经济发展的要求。但这种模式与国际通行的清单计价还存在很大差异,还没有完全脱离定额计价的思路,最后提出了改进和完善工程量清单计价模式的措施,为保证其顺利实施提供参考依据。     

Comparing the effectiveness of respondent-driven sampling and quota sampling in migration research

We evaluate the effectiveness in empirical migration research of the respondent-driven sampling (RDS) and the quota sampling with regard to four criteria: quality of the data; sociometric diversity of the sample; geographic coverage of the sample; and cost-effectiveness. We review two surveys of ex-USSR migrants, conducted simultaneously in the Warsaw metropolitan area, each undertaken with the use of one of the two sampling methods. We find that although the RDS was considerably costlier, it enabled faster data collection and posed a lower risk of underestimating the cost of the survey. We also find that the RDS generated higher-quality data, and that it was more successful in surveying short-term circular migrants. This comparative evaluation contributes to the literature on social research methods in that it links the sampling methods with the quality and character of the data, and helps assess the usefulness and applicability of RDS in empirical migration studies.     

A Bayesian model for multiple change point to extremes,with application to environmental and financial data

Abrupt changes often occur for environmental and financial time series. Most often, these changes are due to human intervention. Change point analysis is a statistical tool used to analyze sudden changes in observations along the time series. In this paper, we propose a Bayesian model for extreme values for environmental and economic datasets that present a typical change point behavior. The model proposed in this paper addresses the situation in which more than one change point can occur in a time series. By analyzing maxima, the distribution of each regime is a generalized extreme value distribution. In this model, the change points are unknown and considered parameters to be estimated. Simulations of extremes with two change points showed that the proposed algorithm can recover the true values of the parameters, in addition to detecting the true change points in different configurations. Also, the number of change points was a problem to be considered, and the Bayesian estimation can correctly identify the correct number of change points for each application. Environmental and financial data were analyzed and results showed the importance of considering the change point in the data and revealed that this change of regime brought about an increase in the return levels, increasing the number of floods in cities around the rivers. Stock market levels showed the necessity of a model with three different regimes.     

论《中美农业合作协议》对湖南农业发展的影响

《中美农业合作协议》及美方要价对湖南农业来说可谓是挑战与机遇并存 ,风险与希望同在。因此 ,湖南应充分利用四年的缓冲期 ,积极采取应对措施 ,趋利避害 ,以取得成功     

On the emptiness of the stability set of order d

We know from Li's theorem (1993) that the stability set of order d may be empty for some preference profiles. However, one may wonder whether such situations are just rare oddities or not. In this paper, we partially answer this question by considering the restrictive case where the number of alternatives is the smallest compatible with an empty stability set. More precisely, we provide an upper bound on the probability for having an empty stability set of order d for the majority game under the Impartial Weak Ordering Culture assumption. This upper bound is already extremely low for small population and tends to zero as the number of individuals goes to infinity.     

构建失业预警系统的探索

建立失业预警系统,为政府有效控制失业率、进行劳动力市场宏观调控提供可靠的参考依据。失业预警系统主要包括预警方法、预警指标、制度安排和管理信息系统等几个方面。为了控制失业率,政府应加强对失业的预测;政府应把控制失业率作为宏观调控的主要目标;建立专职失业风险监测机构;改进失业和就业的统计口径,加强就业统计。     

浅析我国纺织品贸易存在的主要问题

纺织业至今仍然是我国制造业的骨干,是带动经济增长的主要力量之一,在我国28个制造业部门中,2003年至今它的各项指标均处于领先地位。随着我国市场的逐步开放、全球经济一体化进程的不断加快,使得国际、国内市场对纺织品服装的需求不断增加,为我国纺织业提供了更广阔的的发展空     

论传统定额计价如何向工程量清单计价转变

本文从价格理论、计价模式、招投标效果等方面与传统定额计价的区别作了论述,以更好的促进工程量清单计价模式的推广。     

施工企业如何编制自己的企业定额

本文主要从理论上阐述了建筑施工企业编制自己的企业定额的主要方法,对建筑施工企业在市场经济条件下如何编制和运用企业定额提高企业竞争力和适应能力具有指导性的意义。