Optimal Investment in Urban Drainage: A Framework for Cost-Benefit Analysis

This article addresses some basic issues (including distributional weights, discount rates, and the value of life) in the cost-benefit analysis of urban drainage and provides a framework for the estimation of the optimal amount of investment for flood mitigation. This involves: (i) estimating the expected total damage from flooding in present-value terms before flood mitigation; (ii) deriving the reduction in expected total damage as the average recurrent interval of flooding increases; (iii) estimating how this interval increases with the amount of investment in flood mitigation; and (iv) choosing the optimal investment by equating marginal benefit and marginal cost. The framework is also applicable to other accident or damage mitigation investments and some issues discussed are relevant to all types of cost-benefit analysis.     

The response of aggregate demand to income,money supply,and price level

The response elasticities of (nominal) aggregate demand to the price level and to other nominal variables (e.g., money supply) are both positive but smaller than one. Aggregate demand is less/as responsive to real income than/as to the price level in the short/long run. Real aggregate demand is less/as responsive to real income than/as nominal aggregate demand is to the price level in the short/long run. Some uses of these results are indicated.     

Option Valuation with Systematic Stochastic Volatility

We use an extension of the equilibrium framework of Rubinstein ( 1976 ) and Brennan ( 1979 ) to derive an option valuation formula when the stock return volatility is both stochastic and systematic. Our formula incorporates a stochastic volatility process as well as a stochastic interest rate process in the valuation of options. If the “mean,” volatility, and “covariance” processes for the stock return and the consumption growth are predictable, our option valuation formula can be written in “preference-free” form. Further, many popular option valuation formulae in the literature can be written as special cases of our general formula.     

How antidumping measures affect US imports from China: A mesoeconomic perspective of the excess price changes

This paper studies the impact of US antidumping (AD) measures on US import volumes and prices from China, employing both theoretical analysis (mesoeconomics) and empirical analysis (difference in differences). Using US customs data, we find that US AD measures have substantial trade-dampening effects at the product level, and the exogenous increases of costs caused by AD duties push up the import prices of influenced import goods more than the increases in costs. We also build a mesoeconomic model that gives a reasonable and analytical explanation for our empirical findings.     

浅议我国实物地质资料管理与社会化服务

实物地质资料与成果地质资料和原始地质资料一样,是地质工作成果的重要组成部分。在对实物地质资料管理与社会化服务基本认识的基础上,分析了我国实物地质资料管理现状与制约其社会化服务的问题,提出了加强我国实物地质资料管理与社会化服务的对策建议。     

A new ordered family of Lorenz curves with an application to measuring income inequality and poverty in rural China

The most common data source on income distribution in China is grouped data. When income data is in grouped form, some acceptable Lorenz model is needed to approximate the underlying Lorenz curve. This paper presents a new family of Lorenz curves and applies the main model in our proposed family of Lorenz curves to income data for rural China over the period 1980 to 2006. We find that the income share of the rural population at the low end of the income scale has been shrinking, income inequality in rural China has increased over time and that income inequality has impeded attempts to reduce poverty. However, the welfare of the rural population is still improving in terms of the generalized Lorenz dominance criterion.     

后危机时期中国扩大内需政策辩析

后危机时期,为拉动世界经济发展,东亚尤其是中国扩大内需被寄予厚望。但是否增加内需就只能鼓励消费？鼓励购买汽车是否是刺激消费的＂好＂政策？本文对此进行了辨析。     

基于核心能力半径的企业规模边界

企业规模边界的扩张是企业实现增长的一种重要方式,实质是企业能力半径的构建和强化。以核心能力为视角,分析决定企业核心能力半径的因素发现,在不同核心能力半径下,企业规模边界的变动存在规律性变化,企业的能力半径决定了企业规模边界的上限,而核心能力半径决定了企业规模边界的下限。