葡萄球菌肠毒素A的研究进展分析

该文就葡萄球菌肠毒素A的生物学活性、促淋巴细胞增殖和抑制肿瘤细胞生长作用的研究进展作一综述。     

西方产业竞争政策的体系和目标

本文讨论美国、欧共体和日本的竞争政策的方法和体系的差异问题。美国的竞争政策侧重于追求消费者剩余和生产者剩余最大化 ,强调通过竞争的作用来达到这一经济效率目标。欧共体的竞争政策则强调在消费者福利的基础地位 ,通过协调竞争规则来促进欧共体经济一体化的进程。日本的反垄断法原本从西方吸收过来的 ,经过半个世纪的发展和演变 ,已经具有明显的日本特色 ,其基本功特征是对价格机制的运作缺乏信任 ,对规模经济神话的盲目崇拜和信任 ,结果是经常提倡和鼓励那种必然会导致寡占市场结构的兼并活动。     

"10+3"成员国直接税协调的研究

本文介绍了“1O 3” 合作机制的特点、成员国税制和直接税的概况。文中指出,“10 3”成员国政府应高度重视国内税收政策协调问题;尽早建立非官方的税收研究委员会,对各成员国国内税收政策协调问题进行研究;并对企业所得税和个人所得税政策的协调提出建议。     

我国商业银行营销渠道的选择

商业银行营销渠道的选择是一项重要的战略决策，它会极大地影响其经营业绩和成本水平。目前，我国商业银行的营销渠道还比较狭窄，基层网点功能单一，服务手段落后。今后，商业银行要根据目标市场客户的需求，积极开发新的金融产品，大力整合、开发和拓宽营销渠道。     

刘易斯模型与托达罗模型的否定之否定--城市化战略的理论回顾与现实思考

城市化是刘易斯二元经济发展理论的基本政策含义。否定刘易斯模型的托达罗模型导致了农业发展低水平均衡、经济增长低效率和经济结构低级化等消极后果。走出托达罗困境的可行选择 ,是经过修正和补充的刘易斯模型的复归。伴随着发展中国家经济发展战略重点的转换 ,经济发展理论走出了一条螺旋式上升的成长道路     

Option pricing in the presence of natural boundaries and a quadratic diffusion term

This paper uses a probabilistic change-of-numeraire technique to compute closed-form prices of European options to exchange one asset against another when the relative price of the underlying assets follows a diffusion process with natural boundaries and a quadratic diffusion coefficient. The paper shows in particular how to interpret the option price formula in terms of exercise probabilities which are calculated under the martingale measures associated with two specific numeraire portfolios. An application to the pricing of bond options and certain interest rate derivatives illustrates the main results.     

Trade costs, firms and productivity

This paper examines the response of U.S. manufacturing industries and plants to changes in trade costs using a unique new dataset on industry-level tariff and transportation rates. Our results lend support to recent heterogeneous-firm models of international trade that predict a reallocation of economic activity towards high-productivity firms as trade costs fall. We find that industries experiencing relatively large declines in trade costs exhibit relatively strong productivity growth. We also find that low-productivity plants in industries with falling trade costs are more likely to die; that relatively high-productivity non-exporters are more likely to start exporting in response to falling trade costs; and that existing exporters increase their shipments abroad as trade costs fall. Finally, we provide evidence of productivity growth within firms in response to decreases in industry-level trade costs.     

Politics and economics in weak and strong states

While much research in political economy points out the benefits of “limited government,” political scientists have long emphasized the problems created in many less-developed nations by “weak states,” which lack the power to tax and regulate the economy and to withstand the political and social challenges from non-state actors. I construct a model in which the state apparatus is controlled by a self-interested ruler, who tries to divert resources for his own consumption, but who can also invest in socially productive public goods. Both weak and strong states create distortions. When the state is excessively strong, the ruler imposes such high taxes that economic activity is stifled. When the state is excessively weak, the ruler anticipates that he will not be able to extract rents in the future and underinvests in public goods. I show that the same conclusion applies in the analysis of both the economic power of the state (i.e., its ability to raise taxes) and its political power (i.e., its ability to remain entrenched from the citizens). I also discuss how under certain circumstances a different type of equilibrium, which I refer to as “consensually strong state equilibrium,” can emerge whereby the state is politically weak but is allowed to impose high taxes as long as a sufficient fraction of the proceeds are invested in public goods. The consensually strong state might best correspond to the state in OECD countries where taxes are high despite significant control by the society over the government.     

Industry Costs of Equity: Incorporating Prior Information

I examine whether incorporating economically motivated prior information yields more accurate forecasts of industry costs of equity. I find that incorporating the long‐run mean of the Capital Asset Pricing Model (CAPM) parameters and the industry characteristics in the cross section produces more accurate parameter estimates, which subsequently translate into more accurate out‐of‐sample forecasts of industry costs of equity. The outperformance of this method over rolling‐window estimates becomes larger as the forecast horizon extends into the future. These findings provide evidence that the CAPM parameters have a long‐run mean‐reversion property and correlate with the industry characteristics in a systematic way.