入世后我国农业扶持政策存在的问题与对策

文章对我国农业扶持政策的现状和存在问题进行全面剖析,通过研究得出:政府对农业扶持力度在加大的同时也存在不合理方面,如关税设置不合理,"绿箱"支持结构严重扭曲,支农效率低下等。在WTO框架下,在借鉴发达国家农业扶持政策的基础上,为提高我国农产品竞争力和增加农民收入,提出建立完善的我国农业扶持政策的具体对策。     

和谐社会模式下的环境政策分析

环境是人类赖以生存的基本条件。在当今世界,新的环境危机使经济社会的可持续发展受到严重地制约。以我国建设和谐社会为契机,从环境问题与环境政策的关系入手,来分析我国环境政策的现状,提出,为实现人与自然之间的和谐发展人类所应该采取的3种正确态度。在综合分析的基础上, 提出了7条有助于在我国建设和谐社会的环境政策建议。     

论市场社会主义学派的劳动产权理论

劳动产权主要指劳动者按照劳动贡献享有收益的权利。市场社会主义学派对劳动产权问题有着丰富而深刻的分析,认为落实劳动产权有利于解决劳资矛盾,推动劳动生产率的提高,主张劳动者应该获得政治民主、经济民主和利益分配权利,企业的分配制度应该将按要素分配与按劳分配结合起来。     

浅析我国房地产市场过热现象

近年来中国房地产市场越炒越热,房价一路水涨船高,且有继续上涨的趋势。很多人认为房地产市场存在过热现象。房价在近年来迅速上升的原因主要包括人们的收入水平普遍提高,城市化进程加快,土地成本和建筑成本的升高,金融政策比较宽松,人们对房价继续上升的预期,以及海外热钱的涌入。存在的问题主要是供求结构不合理,存在投机行为和金融隐患。建议采取加强土地管理,提高利率以及市场多元化等措施加以调控。     

The predictability of stock returns - a nonparametric approach

This paper reexamines the predictability of stock returns with a nonparametric model. We first identify, through a set of diagnostic tests, five lagged predictive factors from a linear model. Using these factors, we predict one-month-ahead stock index returns with a nonparametric approach. We find that our nonparametricmodel. We first identify, through a set of diagnostic tests, five lagged predictive factors from a linear model. Using these factors, we predict on -month-ahead stock index returns with a nonparametric approach. We find that our nonparametric model can correctly predict about 74% of stock index return signs. With various ex ante trading rules based on nonparametric predictions and transaction cost schedules, we then compare the performance of "managed" portfolios with that of the buy and hold portfolios. We fmd that the managed portfolios are mean-variance dominant over the buy-and-hold strategies when no or low transaction costs are assumed. When high transaction costs are assumed instead, the mean-variance dominance diminishes However,the Sharpe index of risk-adjusted portfolio performanceindicates that the managed portfolios significantly outperform the buy-and-hold strategies even for the high-transaction cost scenario. We show that the difference in performance between the managed portfolios and the buy-and-hold strategies can be partially explained by the January effect or the small firm effect. In sum, this paper demonstrates the merits of using a nonparametric approach for predicting stock returns and testing market efficiency.     

The Potential for Cannibalization of New Products Sales by Remanufactured Products*

The potential for cannibalization of new product sales by remanufactured versions of the same product is a central issue in the continuing development of closed‐loop supply chains. Practitioners have no fact‐based information to guide practice at firms and academics have no studies available to use as the basis for assumptions in models. We address the cannibalization issue by using auctions to determine consumers’ willingness to pay (WTP) for both new and remanufactured products. The auctions also allow us to better understand the potential impact of offering new and remanufactured products at the same time, which provides us insights into the potential for new product cannibalization. Our results indicate that, for the consumer and commercial products auctioned, there is a clear difference in WTP) for new and remanufactured goods. For the consumer product, there is scant overlap in bidders between the new and remanufactured products, leading us to conclude that the risk of cannibalization in this case is minimal. For the commercial product, there is evidence of overlap in bidding behavior, exposing the potential for cannibalization.     

战略导向、组织学习对产品创新的影响研究

本文对战略导向影响产品创新的路径进行了研究,发现不同战略导向对学习活动有不同的选择倾向,而不同类型的学习活动也会对产品创新产生不同的影响。本研究不仅弥补了应用性学习与探索性学习研究的不足,也有助于企业引导和利用组织学习来提高产品创新水平,为管理实践提供理论参考。     

Strategic Liquidity Provision in Limit Order Markets

We characterize and prove the existence of Nash equilibrium in a limit order market with a finite number of risk‐neutral liquidity providers. We show that if there is sufficient adverse selection, then pointwise optimization (maximizing in p for each q) in a certain nonlinear pricing game produces a Nash equilibrium in the limit order market. The need for a sufficient degree of adverse selection does not vanish as the number of liquidity providers increases. Our formulation of the nonlinear pricing game encompasses various specifications of informed and liquidity trading, including the case in which nature chooses whether the market‐order trader is informed or a liquidity trader. We solve for an equilibrium analytically in various examples and also present examples in which the first‐order condition for pointwise optimization does not define an equilibrium, because the amount of adverse selection is insufficient.     

上证指数收益率的特征及其波动性分析

股票价格的频繁波动是股票市场最明显的特征之一。ARCH类模型可以很好地预测金融资产收益率的方差。通过对上证指数的统计分析表明,上证指数的收益率分布表现出非正态性,并存在自回归条件异方差的特征。利用ARCH类模型对上证指数的波动进行了拟合,结果表明GARCH(1,1)模型对上证指数波动具有较好的拟合效果。