中美购买力评价分析与中国汇率制度的调整——基于2005年7月汇率改革以来的实证分析

自2004年以来,西方国家基于购买力平价理论,纷纷对我国施加压力,要求人民币升值,以减轻本国的贸易赤字。他们通过比较人民币与其本国货币的购买力水平后发现,我国货币汇率严重低估。文章拟通过分析2005年汇率改革以后购买力平价理论在我国的适用性,说明购买力平价理论在我国缺乏实用性以及我国汇率形成制度的缺陷,并提出完善人民币汇率形成机制的方向和途径。     

What moves housing markets: A variance decomposition of the rent–price ratio

We apply the dynamic Gordon growth model to the housing market in 23 US metropolitan areas, the four Census regions, and the nation from 1975 to 2007. The model allows the rent–price ratio at each date to be split into the expected present discounted values of rent growth, real interest rates, and a housing premium over real rates. We show that housing premia are variable and forecastable and account for a significant fraction of rent–price ratio volatility at the national and local levels, and that covariances among the three components damp fluctuations in rent–price ratios. Thus, explanations of house-price dynamics that focus only on interest rate movements and ignore these covariances can be misleading. These results are similar to those found for stocks and bonds.     

中国城市住宅市场的结构差异性分析

市场价商品房、经济适用住房和廉租房构成了目前中国城市住宅市场的供应体系.依据中国30个主要城市的房地产开发统计数据,选择吸纳率作为评价住宅市场供需均衡状态的指标,利用固定影响变截距模型,重点研究了商品房和经济适用住房供给结构的城市差异性.研究发现,在城市住宅市场中,经济适用住房市场和商品房市场具有很强的相关性.作为具有政府资助性质的经济适用住房建设,存在典型的地域性特征,其政策的设定和实施会对整个住宅市场产生影响,地方政府应在利用比较全面的住宅市场指标体系进行综合分析基础上,制定适合本地的经济适用住房政策.     

EXCHANGE RATE TARGET ZONES: A SURVEY OF THE LITERATURE

This work selectively reviews the literature on exchange rate target zones and their theoretical and empirical methodologies and examines whether they can be used to clarify to what extent this type of exchange rate regime could contribute to greater exchange rate stability. We discuss the main contributions of the first and second generations of exchange rate target zone models. In an attempt to reconcile the poor empirical performance of the Krugman model with the reality of exchange rate target zone regimes, this line of research integrates target zones with alternative underlying economic models, such as imperfect credibility, intra‐marginal interventions and sticky price models. It was thus possible to understand the correlations observed between the exchange rate, its fundamentals determinants and the interest rate differential, and to explain the fact that the statistical distribution of the exchange rate is hump shaped rather than U shaped. This implies that the initial emphasis of target zone models on nonlinearities, ‘honeymoon effect’, ‘smooth pasting’ and marginal interventions has vanished. Exchange rate target zones are better described as similar to managed floating regimes with intra‐marginal interventions, with some marginal interventions when the exchange rate reaches the edges of the floating band.     

Impact of China's currency valuation and labour cost on the US in a trade and exchange rate model

Ricardian dynamic general equilibrium analyses show that under free trade arrangements a low income country with lower wage cost and large endowment of labour has comparative advantage in trade. Efficiency gains from this enhance economic growth and welfare of households simultaneously in both low income and advanced economies. Theoretical predictions are empirically validated here with structural VAR analysis based on quarterly data over the time period 1995:1 to 2009:1 on China's relative wage cost, interest rate differential, real effective exchange rate (REER), relative GDP and the US current account balance. It is shown how the relative prices of labour, capital and the currency affect the economic activity in China and current account balance in the US. With free capital inflows and outflows and restrictions on labour mobility, comparative advantage of China and the trade deficit of the US will both be minimised if China allows real appreciation of the Yuan and complete adjustment in prices. Higher production cost and prices in China could reduce welfare of Chinese households and the trade imbalance of the US, while higher relative GDP of China lowers the current account balance for the US.     

东北某铁路小流域水文计算与流量验证

水文计算是铁路勘察设计中的重要内容。本文针对长西铁路小流域水文计算,对地方经验公式法、铁三院法计算结果进行综合分析,并用形态法进行验证,确定适合本地区小流域流量的计算公式,为准确计算暴雨径流提供科学依据。     

货运车辆燃油消耗与运输效率关系研究

文中采用理论分析与模型构建相结合的方式,研究货运车辆的燃油消耗与运输效率之间的关系,基于调研数据,采用回归分析的方法构建模型,得到了不同车型车辆的百吨公里燃油消耗量与实载率的倒数关系模型,为企业提高车辆运输效率,降低燃油消耗提供数据参考。     

浅谈工程施工投标技巧

面对日益激烈的市场竞争,企业如何提高中标率以及如何在投标中获取最大的利润等都已经成为人们较为关注的重点,其中投标的编制技巧与报价策略都成为投标单位较为关注的热门话题,而投标策略和技巧在中标率较高的施工企业中有着不可忽视的作用。投标技巧主要就是以投标人在投标过程中需要关注的问题为重点。     

The Eisner Puzzle,the Unemployment Threshold and the Range of Equilibria

Using a two-regime model of the inflation-unemployment process for US data 1960:2 to 2000:2, this paper finds strong evidence to support the Eisner puzzle, which occurs when the short-run Phillips curve (SRPC) is flatter at low rates of unemployment than at higher rates. The puzzling aspect of this pattern is the expectation of excess demand to become apparent at very low rates of unemployment causing the SRPC to be steep rather than fairly flat. We show the puzzle can be resolved by estimating a three-regime model which reveals a steep SRPC at very low rates of unemployment. The estimates of the three regime model also reveal a horizontal SRPC at intermediate rates of unemployment, implying the existence of a range of equilibrium rates of unemployment at those intermediate rates.

Temporary stabilization with capital controls

This paper studies both positive and normative aspects of quantity-based capital controls in a small open economy undergoing a temporary inflation stabilization plan. In the model, capital controls are implemented by choosing two policy variables: a ceiling on the private sector debt and a terminal date for removing controls; the date on which controls trigger and hence its duration are endogenously determined. Equilibrium dynamics are characterized for all feasible range of debt ceilings and durations. Temporary controls that end with the collapse of the stabilization plan are shown to mitigate consumption boom-bust cycles and dominate allocations under perfect capital mobility, thus providing a “second-best” rationale for employing them. For controls that are prolonged beyond the collapse of the stabilization plan, equilibria exist even when the debt ceiling is above the debt that accumulates under perfect capital mobility. Here, if the ceiling is sufficiently low, controls mitigate consumption cycles. Conversely, a sufficiently high ceiling amplifies consumption cycles. For prolonged controls, there is a critical value of debt ceiling below (above) which the welfare is higher (lower) relative to the perfect capital mobility case. Finally, for a given debt ceiling, prolonged controls rank lower in welfare than those that end with the stabilization plan. We would like to thank two anonymous referees and the editor whose suggestions have helped us improve the paper substantially. The usual disclaimer applies.